1、in iot applications, the method that does not belong to short-range communication is a、rfid b、bluetooth c、wifi d、nb-iot
2、in the application of internet of things, the communication methods commonly used in indoor close-range iot are: a、bluetooth b、wifi c、gprs d、nb-iot
3、bill gates first proposed the concept of the internet of things.
4、industrial internet of things is a key development direction of china's internet of things in recent years.
5、the four elements of the internet of things are perception, connection, notification and control.
6、the internet of things platform has become the next strategic fortress for the development of the internet of things.
7、zigbee does not have the characteristics of ad hoc networks.
8、the iot operating system is the operating system running on the embedded terminal, and has nothing to do with the cloud platform.
9、the fragmentation of the internet of things is a challenge for the development of internet of things applications.
10、the role of the internet of things operating system is only to solve the fragmentation problem at the technical level.
chapter 2 internet of things cloud platform
unit test 2
1、which of the following is not a technology that may be involved in the network layer in an iot architecture(iot system)? a、optical fiber b、nb-iot c、rfid d、ipv6
2、which of the following is not a device management service provided by alibaba cloud link platform? a、life cycle management b、data analysis c、streaming data analysis d、firmware upgrade
3、which of the following is not a component of china mobile's onenet platform? a、device access b、device shadow c、device management d、http push
4、which of the following statements about iaas is correct? a、mainly include computer servers, communication equipment, storage equipment, etc. b、a software model providing software services via the internet c、ability to provide users with computing power, storage capacity or network capabilities and so on, according to their demand d、provide users with services about software development, operation and operation environment
5、what are the display portal for business applications? a、pc portal b、web portal c、client portal d、app portal
6、which of the following are the functions of the device management platform dmp? a、monitoring iot terminals b、adjusting terminal settings c、grasping the terminal's communication connection status d、storing and analyzing device data
7、which of the following statements about device shadow services in aws iot is correct? a、device shadow is a json document b、device shadow is used to store and retrieve the current status information of the device c、the device can publish its own status information to device shadow for applications or other devices d、only when the device is connected to aws iot, users can post updated status information to device shadow
8、which of the following are the advantages of using baidu iot hub to build iot applications? a、seamlessly connect to various products and services of tiangong platform and baidu intelligent cloud b、support for concurrent connections and messages in billion level c、support for secure and reliable bidirectional connection between massive devices and the cloud d、
9、the connection management platform cmp can help users manage the iot sim card, and it can also query the terminal's communication connection status and data usage.
10、the internet of things platforms launched by major companies are completely consistent in function, such as alibaba cloud link platform and baidu iot hub.
chapter3 introduction to the smart house
unit test 3
1、how to directly obtain an analog value within the measurable range？(single choice) a、dac b、spi c、iic d、adc
2、when the output interface is analog data, which of the following methods can be used ? a、adc b、dac c、pwm d、uart
chapter4 hardware components of the smart house
unit test 4
1、the module responsible for converting analog signals to digital signals is called________. a、bme280 b、ccs811 c、mq-5 d、adc
2、the communication way used to connect the wifi module of the smart house to the arduino uno is________. a、iic b、uart c、spi d、analog
3、the do function of the sensor module pin is________. a、analog signal output b、digital signal output c、the reference voltage d、offset signal
4、the data protocol not supported by bme280 sensor is________. a、spi b、iic c、uart d、none of the above options.
5、the ambient temperature and humidity sensor used in the smart house is________. a、ccs811 b、mq-5 c、bme280 d、emw3080
6、the signal line responsible for clock synchronization in the spi protocol is________. a、mqsi b、miso c、sck d、ss
7、when using the arduino uno development board for serial data communication, the development board data is sent via the ________ port. a、rx port 0 b、tx port 1 c、tx port 0 d、rx port 1
8、the following ________ does not belong to the common frequency band of wifi. a、2.4ghz b、5ghz c、11.3ghz d、none of the above options.
9、in the iic protocol, the master device wakes up the slave device with a chip select signal.
10、the iic protocol is a half-duplex communication protocol.
chapter5 cloud platform composition
unit test 5
1、what symbols does json use to represent objects? a、{} b、[] c、: d、""
2、the triplet does not include which of the following? a、productkey b、devicesname c、devicesecret d、productsecret
3、how many message types are there in mqtt? a、6 b、8 c、14 d、16
4、which protocol is the mqtt protocol based on? a、http b、tcp/ip c、ftp d、smtp
5、what are the attribute-support request methods? a、get b、set c、input d、output
6、what functions does iot hub have? a、support data pass-through b、support multiple communication modes c、high performance expansion d、support multiple device access protocols
7、what network access does the iot platform support? a、2g/3g/4g b、lora c、nb-iot d、wifi
8、what are the functions completed by the mqtt client? a、publish information that other clients may subscribe to b、subscribe to messages published by other clients c、unsubscribe or delete application messages d、disconnect from the server
9、what are the functions completed by the mqtt server? a、receive a network connection initiated from the client b、receive authentication and authorization information issued by customers c、handling subscription and unsubscription requests from clients d、send messages to subscribers
10、you can directly import and use other people's thing models.
11、alibaba cloud offer free messages receiving and sending sevices.
12、data uploaded to alibaba cloud can only be processed in alibaba cloud.
13、when the device is temporarily unused or the device is abnormal, the processing method is to delete the device.
14、publishers and subscribers do not transmit messages directly, but through broker.
chapter6 software implementation of smart house
unit test 6
1、the number of analog ports equipped on the arduino uno development board is ________. a、6 b、5 c、13 d、14
2、the status bar of the arduino ide is ________. a、to output compilation or error message b、to write code c、to view serial output d、to display program running status
3、if the reference level is 5.0v, the data read is 800, indicating that the level of the a2 port is ________. a、3.92v b、800mv c、4.0v d、2.58v
4、the function of pinmode () is ________. a、configure the port as input, output, or input and pull-up b、make the led light on the arduino uno flash at certain intervals c、delay for a certain time d、make the port output digital high or low
5、the operation that digital port 3 cannot complete is ________. a、read in analog level b、output digital high level c、read digital low d、output 490hz pwm waveform
6、when creating a new project file in arduinoide, the loop () function will be automatically created. this function will be used to ________. a、the content in the function will continue to loop, and the main program code should be written. b、the content in the function will initialize the created function, and the custom function should be written. c、the content of the function will be executed first, and only once, and the initialization code should be written. d、no specific effect, it can be deleted.
7、if serial asynchronous communication is adopted, how can the two communication parties achieve the same level duration? a、the parties to the communication agree on the bit rate before the communication begins. b、when communication starts, the master sends bit rate information to the slave. c、during communication, the sender differentially encodes the signal. d、no agreement is required.
8、the following statement about the arduino uno serial port, ________is wrong. a、if the usb-to-serial chip is damaged, the arduino uno will not be able to send information externally via the serial port, and the cabin function cannot be achieved. b、when sending information to the arduino uno through the serial monitor, the rx indicator will flash. c、connect the serial port signal output by the peripheral device to the no. 1 (tx) port of the development board, and the serial port monitor can view the message content. d、except the arduino ide serial port assistant software, you can also get the information sent from the usb to the serial port.
9、a communication is initiated through the i2c bus, and the level of the clock line scl changes to ________. a、keep high b、from high to low c、from low to high d、keep low
10、in the i2c communication process, when the host sends data, the slave device does not need to send an ack signal to the received data in response to ________. a、communication termination signal b、slave address c、register address d、data written to the register
11、in a cloud-controlled irrigation system, it is necessary to implement instructions for the cloud to issue irrigation actions, and define the type of this function as ________. a、service b、attribute c、event d、the remaining options do not match
12、when a device updates the status attribute data to the cloud, the topic it should send to is ________. a、/sys/a1llaa50xyl/bme280/thing/event/property/post b、/sys/a1llaa50xyl/${devicename}/thing/event/property/post c、/sys/a1llaa50xyl/bme280/thing/service/property/set d、/sys/a1llaa50xyl/bme280/thing/deviceinfo/update
13、alibaba cloud internet of things currently supports message content query and the recommended service quality is ________. a、qos=1 b、qos=0 c、qos=2 d、other options are all available
14、the following statement about the way of accessing the alibaba cloud platform based on open source mqtt , ________ is wrong. a、the alibaba cloud platform only supports open source mqtt connections that do not use tls encryption. b、username consists of devicename and productkey. c、the password is obtained through a hash algorithm, and this calculation process is irreversible. d、the keepalive time of the heartbeat packet is less than 30 seconds or greater than 1200 seconds, the platform will refuse to connect.
15、the operating system supported by the installation package provided by the arduino ide is ________. a、windows b、mac os c、linux d、android
chapter7 iot studio service rule choreography
unit test 7
1、what iot development capabilities does iot studio have a、visually build the app b、visually build the web c、device development d、service development
2、what information in the shared bicycle system is impossible for the electronic lock to report to the platform a、geographic location b、battery power c、user info d、conversation message
3、the following claims about service development, which one is wrong a、only one service can be included in a project b、can contain multiple services in one project c、two devices can be linked in one service d、at least 2 service flows are required to realize the linkage of 2 devices
4、iot studio itself does not have data storage capabilities, it is achieved by dumping to various alibaba cloud storage products
5、the business logic in iot studio is ultimately reflected in the service orchestration
6、all development resources in iot studio are managed according to the project
7、the communication process between the virtual device and the platform in iot studio is no different from the real device, except that the reported data is simulated by the user
8、device linkage controls the device through the device node
chapter8 web development for the smart house
unit test 8
1、who invented web technology in the first place a、berners-lee b、paul allen c、bill gates d、steve wozniak
2、which of the following is the architecture of web technologies a、c/s architecture b、b/s architecture c、d/s architecture d、a/s architecture
3、the following is an error in the description of the text component a、text components are used to display text on a page and can be dragged and placed in any position b、text components can be configured to associate device data c、the text component must configure the data content options, otherwise the content will not display properly d、text components can be configured for interactive actions
4、the html language is a markup language
5、there can only be one visual build page in a web visual development
6、the switch component can display different styles when switching different content by setting the on/off diagram
7、the curve component can bind to device properties and view properties over a period of time through a time selector
8、you can interact directly with the device through a button component
chapter9 app development of smart house
unit test 9
1、which language is mainly used for the development of apps on ios platform a、c b、java c、python d、swift
2、which of the following options is not configurable by the app visual component a、style b、data c、fixed position d、action
3、which of the following is the operating system of the mobile terminal a、android b、ios c、symbian d、windows phone
4、in app construction, an app can contain multiple pages, and each page can jump to each other
5、in the visual construction of app, real-time preview of development page on mobile devices can be provided
chapter10 nb-iot: narrow band internet of things
unit test 10
1、which is not the enhancement of nb-iot rel-14 compared with rel-13? a、localization b、mobility c、transfer rate d、multicast
2、how many users can one nb-iot cell support? a、40,000 b、50,000 c、60,000 d、70,000
3、the coverage level of nb-iot is divided according to _____ a、mme b、mtl c、mcl d、ptu
4、the same frequency reselection is based on sort of _____，while the different frequency reselection is based on sort of _____. a、frequency, cell b、frequency, load c、load, frequency d、cell, frequency
5、the biggest advantage of qualcomm chip is its ______ a、extreme low power consumption b、extreme wide area c、multi frequency ranges d、high transfer speed
6、which sub carriers does one upstream transfer support under multi-tone mode? a、1 b、3 c、6 d、12
7、which are the two modes of the rrc protocol? a、rrc_idle b、rrc_wait c、rrc_connected d、rrc_disconnected
8、which are the downstream transfer channels? a、npbch b、npdcch c、npdsch d、npdbch
9、edrx is suitable for remote meter reading.
10、cp mode is suitable for transferring small data packet.
11、hss refers to home subscriber server
12、implicit detachment can only be initiated by network side.
13、one net is an iot platform produced by huawei.
chapter11 lora communication
unit test 11
1、which of the following rates cannot be the transmission rate of lora a、10kbps b、50kbps c、300kbps d、3mbps
2、for the one with strict requirements on low power consumption, which lora mac terminal is better? a、class a b、class b c、class c d、class d
3、the lora network architecture mainly includes the following parts. a、node b、gateway c、network server d、application server
4、the main functions of the lora terminal include :. a、collect sensor data b、transfer data to the gateway c、forward data to the server d、implement system application software
5、lpwan technology can achieve network coverage of several kilometers or even tens of kilometers.
6、the biggest feature is that under the same power consumption condition, it spreads farther than other wireless methods, and realizes the unification of low-power consumption and long distance.
7、in spread spectrum communication, the bandwidth of the signal used to transmit information is slightly larger than the bandwidth of the information itself.
8、at the same chip rate, the greater the spreading factor, the greater the data transmission rate.
9、lorawan has the characteristics of adaptive data rate
10、the lora network contains the basic lorawan (called class a) and optional functions (class b, class c)
chapter12 internet of things operating system
unit test 12
1、which of the following mechanisms is not used for inter-task communication in freertos kernel? a、mutex b、semaphore c、event flag d、message mailbox
2、when the task takes a semaphore, no special event has occurred, the semaphore is empty, and the task will enter the____ state. a、suspend b、pend c、ready d、locked
3、how many layers are there in the alios things architecture? a、7 b、6 c、5 d、8
4、what communication solution does alios things use for mcus that don't have network data capability? a、external communication module b、replacement of soc with data transceiver c、manual networking d、automatic networking
5、alios things works well with aliyun iot suite via the___ protocol. a、http b、xmpp c、coap d、mqtt
6、where do task scheduling points occur? a、os initialization b、receiving interrupt c、suspended by yourself d、time slot expires
7、embedded operating system has gone through four stages: no operating system, simple operating system, real time operating system, and internet oriented operating system.
8、the locked state indicates that task is in a state of waiting for an event, and task can exit the locked state and go into the running state only when the event it is waiting for arrives.
9、a binary semaphore doesn't care what messages are stored in the queue, as long as it knows whether the queue is full or empty.
10、priority inheritance means that high-priority tasks take the low-priority tasks with mutual exclusion to a higher priority than themselves and make them run first.
11、each client in a single-hop network can access the network over multiple wireless links connected to the ap.
12、edge computing is a computing technology that can be done at the edge of a network. such technologies and platforms upload and download data between the cloud and iot devices to balance the requirements of system computing, real-time performance, power consumption, and security.
13、the application priorities of the front and back end systems are different.
14、message queuing follows the principles of lifo.
final exam
final exam (objective question)
1、the following applications that are most suitable for connection and communication with nb-iot is a、home smart speaker b、shared bicycle c、smart workshop d、video surveillance
2、which of the following components is not included in the rfid system a、battery b、reader c、label d、firmware program
3、regarding independent deployment below, the correct statement is a、no interference with current lte network b、can maximize the use of spectrum resources c、network deployment on prb resources d、transmission bandwidth is 200khz
4、among the following communications, the fastest transmission rate is a、bluetooth b、wi-fi c、zigbee d、nb-iot
5、regarding independent deployment below, the correct statement is a、no interference with current lte network b、can maximize the use of spectrum resources c、network deployment on prb resources d、transmission bandwidth is 200khz
6、during the cell reselection process, the ue will select the cell with the highest _____ to read system messages based on the measurement results a、credibility b、radiated power c、r value d、coverage
7、the biggest feature of qualcomm chips is a、ultra low power consumption b、ultra-wide coverage c、multi-band d、high-speed transmission
8、in lorawan, in order for the server to be able to contact the terminal at a certain time, and to keep the terminal's power consumption as low as possible, which type of terminal needs to be used. a、class a b、class b c、class c d、all other options
9、in lorawan, which type of terminal needs to obtain and track the beacon. a、class a b、class b c、class c d、all other options
10、in lorawan, which type of terminal opens the receiving window at all times except the sending time. a、class a b、class b c、class c d、all other options
11、freertos kernel is a ____ operating system. a、single task, preemptive b、multitasking, sequential c、multitasking, preemptive d、single task, sequential
12、when counting semaphore is used for resource management, its initial value should be set to __ a、maximum number of resources b、number of incidents c、1 d、0
13、after the iot platform sends the firmware update instruction, it will send the firmware download address url to the device, and the device uses the ___ protocol to download the firmware from this address. a、http b、xmpp c、coap d、mqtt
14、which of the following is not a limitation brought by single-hop networks？ a、communication delay b、small coverage c、not strong enough d、easily congested
15、what kind of iot operating system does alios things belong to? a、os platform specially developed for iot applications b、based on embedded os, expand the os platform supporting iot applications c、from the cloud layout, expand the os platform supporting iot applications d、os platform based on hardware device design
16、which of the following is not an advantage of using iot platform development? a、from the bottom of the device to the cloud application, all developed by the technical staff b、speed up the development of iot application solutions, while ensuring its functional performance and stable reliability c、provide the platform as a service to users, reducing the development cost of application providers d、reduce the requirements for the developer's knowledge system
17、which of the following descriptions about the characteristics of paas is incorrect? a、package the platform into a service to reduce the development cost of application vendors b、the paas provider is only responsible for providing the platform. as for its long-term and stable operation, it needs to be maintained by the application provider. c、paas provider provides technical support for the platform d、paas abstracts a large number of programmable interfaces while providing elastic service support
18、what kind of iot platform has appeared in response to the massive connection of iot applications, the use of a large number of sim cards, and the heavy workload of management? a、dmp b、bap c、aep d、cmp
19、which of the following statements about the application enablement platform aep is wrong? a、aep includes application development tools, data storage functions, and apis for connecting to third-party systems, etc. b、enable rapid application development, deployment and management c、application developers still need to consider the expansion of the underlying infrastructure to avoid the situation that the underlying resources cannot keep up with the rapid expansion of connected devices d、save the cost of hiring technical personnel for the underlying architecture and reduce development costs
20、which of the following is the iot cloud platform launched by amazon? a、azure iot b、aws iot c、onenet d、jasper
21、which of the following is the function of the rule engine component in aws iot? a、provide security mechanisms for devices and aws iot applications to publish and receive messages to each other b、enable devices to communicate with aws iot securely and efficiently c、provide message processing and the ability to integrate with other aws services d、store and retrieve the current status information of the device
22、what is the role of china mobile's onenet platform? a、iaas b、paas c、saas d、other
23、what is the function of the message queue mq component in china mobile onenet platform? a、push the real-time data that users care about to the user's application server b、allow users to perform device management, data query, device command interaction and other operations by using api c、enable the application layer to obtain device messages quickly and reliably d、provide safe and stable equipment access services
24、how will the computing power of the internet of things develop in the future? a、from data center-based computing power to edge computing closer to the end b、further develop computing power based on data centers c、from near-end edge computing to data center-based computing power d、other
25、in the arduino uno port, the tilde ~ at the beginning means ________. a、the port is a digital port b、this port supports pwm output c、the port supports analog read and write d、the port is resistant to high pressure
26、the function of icsp port of arduino uno development board is ________. a、output serial port information b、output program running information c、programming to the controller d、select boot mode
27、if the arduino uno is powered by a voltage regulator circuit, the operating voltage of the arduino uno main control chip is ________. a、3.3v b、5v c、7v d、12v
28、the high level and low level specified by 5vttl are ________ respectively. a、high level 5.0v low level 0v b、high level 3.3v low level 0v c、high level 2.4v~5.0v low level 0v~0.5v d、high level 2.4v~3.3v low level 0v~0.4v
29、when the arduino uno development board is used for serial data communication, the data of the development board is received through the ________ port. a、rx port 0 b、tx port 1 c、tx port 0 d、rx port 1
30、when the arduino uno development board performs spi digital communication, the default signal port is ________. a、11-port mosi and 12-port miso b、13 port sck c、10-port ss d、abc
31、regarding the spi communication method below, the wrong statement is ________. a、spi is a full-duplex communication protocol, and data can be sent and received at the same time. b、spi is an asynchronous communication protocol. c、spi communication must be synchronized with the clock signal. d、spi is a bus protocol that supports simultaneous connection of multiple slave devices.
32、when the i2c bus is not in use, its level is ________. a、high level b、low level c、invalid level d、all other options are possible
33、the pm2.5 sensor used by the smart house is ________. a、ccs811 b、mq-5 c、bme280 d、emw3080
34、the combustible gas detection sensor used by the smart house is ________. a、ccs811 b、mq-5 c、bme280 d、emw3080
35、the high level and low level specified by lvttl are ________. a、high level 5.0v low level 0v b、high level 3.3v low level 0v c、high level 2.4v~5.0v low level 0v~0.5v d、high level 2.4v~3.3v low level 0v~0.4v
36、the signal line responsible for clock synchronization in the iic protocol is ________. a、gnd b、sda c、sck d、ss
37、the ao function of the sensor module pin is ________. a、analog signal output b、digital signal output c、current output d、amplified output
38、mq-5 gas sensor has good sensitivity to ________. a、liquefied gas b、propane c、hydrogen d、abc
39、the data protocol supported by ccs811 sensor is ________. a、spi b、iic c、uart d、abc
40、the function of the varistor mounted on the combustible gas sensor daughter board is ________. a、adjust the supply voltage of the sensor b、adjust the supply current of the sensor c、adjust the trigger threshold of the analog output d、adjust the trigger threshold of the digital output
41、the role of the operational amplifier in the photosensitive sensor daughter board is ________. a、amplified output voltage b、amplified output current c、voltage comparison d、convert analog output to digital output
42、the advantage of wifi is ________. a、wide coverage b、fast transmission speed c、no wiring required d、abc
43、the content that must be included in the wifi module is ________. a、ieee802.11b.g.n protocol stack b、tcp/ip protocol stack c、hardware mac address d、abc
44、the content that must be included in the wifi module is ________. a、compatible with other level formats b、provide power to the module c、communication multi-protocol support d、receive wifi signal
45、the programming language used in arduino development is ________. a、assembly language b、c c、wiring d、python
46、in the smart house, the module responsible for network connection and data upload is ________. a、ccs811 b、mq-5 c、bme280 d、emw3080
47、in the smart house, the protocol used for communication between emw3080 and arduino uno is ________. a、uart b、iic c、spi d、modbus
48、after creating a device on alibaba cloud, how to activate the device? a、set activation b、a device containing triples runs once c、request manager settings d、
49、what is topic for? a、product b、device c、 d、
50、the positive and negative poles of the external power supply interface of the arduino uno development board are ________. a、negative inside and positive outside b、positive inside and negative outside c、any positive or negative d、alternating current, no distinction between positive and negative
51、the number of digital ports equipped with arduino uno development board is ________. a、5 b、6 c、13 d、14
52、which of the following statements about arduino ide is wrong a、the button functions in the toolbar can be found in the menu bar. b、the upload operation includes the compilation operation, and there is no need to compile the code before uploading the code. c、the compile function will automatically correct the wrong code. d、by changing the port, the same code can be uploaded to different development boards.
53、the usage of pinmode() function is classified as ________ in reference. a、language b、libraries c、glossary d、structure
54、the default adc reference level of arduino uno development board is ________. a、external level of aref pin b、5.0v c、3.3v d、1v
55、the resolution of the successive approximation analog-to-digital converter used by the arduino uno development board is ________. a、8 bits b、9 bits c、10 bits d、11 bits
56、to send information through the serial port, the function that should be used is ________. a、digitalwrite( ) b、serialwrite( ) c、digitalprint( ) d、serial.print( )
57、the arduino uno development board defaults to 8 data bits, no parity, and 1 stop bit for uart serial communication. during the communication process, the number of signal bits contained in each frame is ________. a、8 bits b、9 bits c、10 bits d、11 bits
58、a communication is initiated through the i2c bus, and the level change of the data line sda is ________. a、from high to low b、from low to high c、keep high d、keep low
59、in the function setting of the smart house, the condition for the exhaust fan to turn off is ________. a、both the combustible gas concentration and the carbon dioxide concentration are below the shutdown threshold b、both the combustible gas concentration and the carbon dioxide concentration are higher than the shutdown threshold c、the concentration of combustible gas or carbon dioxide is below the shutdown threshold d、the concentration of combustible gas or carbon dioxide is higher than the shutdown threshold
60、in a cloud-controlled irrigation system, in order to realize the terminal uploading the warning of soil drought, we define the type of this function as ________. a、attributes b、service c、event d、the other options do not match
61、the characteristics of the soil moisture sensor used in the smart house are negative correlation. the so-called negative correlation means ________. a、the higher the soil moisture, the higher the output voltage b、the higher the soil moisture, the lower the output voltage c、the higher the soil moisture, the greater the output current d、the higher the soil moisture, the lower the output current
62、the at command to start the mqtt service is ________. a、at mqttauth b、at wjap c、at mqttsub d、at mqttstart
63、if you want to access wifi through the emw3080 module, the name is ssid, the password is 12345678, and the at command that should be used is ________. a、at wjap? b、at wjap=ssid,12345678 c、at wsap=ssid,12345678 d、at mqttauth=ssid,12345678
64、to create a smart house in alibaba cloud, you should first create a new ________. a、features b、device c、product d、triple
65、similar to alibaba cloud's triplet, the authentication of the standard mqtt protocol also needs to provide authentication keywords, which do not include ________. a、username b、password c、clientid d、timestamp
66、which of the following statements about the object model of ali's iot platform is wrong ________. a、the platform analyzes the uploaded data packet according to the object model. b、the data package uploaded by the device must not only conform to the object model standard, but also must contain the correct unit. c、the data package uploaded by the device conforms to the json format. d、the object model contains all the information of the product function, as long as the object model file is available, all functions can be reproduced.
67、in the blink sample code, for the arduino uno development board, the port represented by led_builtin is ________. a、d0 b、d1 c、d13 d、a1
68、if the reference level of 3.3v is used, the data read is 800, indicating that the level of the a2 port is ________. a、800mv b、4v c、3.92v d、2.58v
69、in the open source mqtt access method used by the smart house, the encryption algorithm of the password is calculated as ________. a、crc-32 b、hmac-md5 c、hmac-sha1 d、hmac-sha256
70、the function of delay() is ________. a、make the led on arduino uno flash at a certain interval b、configure the port as input, output, or input and pull up c、delay for a certain time d、make the port output digital high or low level
71、the type of microprocessor used by arduino uno development board is ________. a、atmega328p b、stc15f2k60s2 c、stm32f103zet6 d、atmega32u4
72、which of the following is not a feature of iot studio service orchestration a、the user can complete the configuration by dragging and dropping, and does not need to care about the operation and maintenance of the service b、service orchestration can easily realize equipment linkage, alarm push, etc. c、service orchestration provides the storage capacity for massive data, which can store device data permanently on the iot studio platform d、the function block can be used in the service flow to query the external weather and call it through the network
73、which of the following is the last operation step before using the iot studio service a、service flow connection b、service debugging c、service release d、service preservation
74、what is the entry function of the python script? a、index b、main c、handler d、resove
75、before the node, the context is passed through a variable. which of the following is this variable a、context b、payload c、logger d、node
76、which variable does dingding robot push through to identify the target of dingding push? a、context b、target c、webhook d、webhood
77、in the b/s architecture, the protocol for sending data to the server when the browser requests a web page is as follows a、http b、ftp c、sftp d、mqtt
78、which of the following tag packages does javascript use in html files? a、script b、javascript c、meta d、html
79、which of the following statements about css is wrong a、css refers to cascading style sheets, which can bring rendering style effects to html b、the css must exist and must be in the same file as the html file c、css can be bound to html tags by id d、css can be bound to html tags through classname
80、which of the following options is not included in the front-end development process a、front and rear interface design b、front-end development framework selection c、front-end coding development d、server unit debugging
81、which of the following descriptions of text components is wrong a、the text component is used to display the text of the page, you can drag the position at will b、the text component can be configured to associate with device data c、the text component must be configured with data content options, otherwise the content cannot be displayed normally d、the text component can be configured with interactive actions
82、which programming language is mainly used for android development? a、python b、go c、java d、c
83、which language is mainly used to develop apps on the ios platform? a、c b、java c、python d、swift
84、what is incorrect about the container and component in app visualization a、container components can provide horizontal space division for the page b、container components can provide vertical space division for the page c、container component cannot be nested in another container component d、container components can contain other visual components
85、which of the following options is not configurable by the app visualization component a、style b、script c、data d、action
86、there are many types of iot platforms, which can include a、bottom support platform b、sim card management platform c、solution platform d、vertical industry platform
87、which of the following is the process completed when nb-iot device registration a、update nidd configuration b、registration update c、default bearer establishment d、authentication and encryption
88、regarding the paging process of the nb-iot terminal, the correct statement is a、configure edrx only through the broadcast control channel b、when the ue is in idle state, it receives paging on the anchor carrier c、the maximum edrx cycle is 49.36 minutes d、ue only supports to answer pcch paging in connected state
89、the protocol level of lorawan includes a、physical layer b、mac layer c、transport layer d、application layer
91、which of the following features does the rtos operating system have? a、multitasking b、tailorability c、real-time d、reliability
92、the state of task in freertos is roughly divided into running state and non-running state, and the non-running state can be subdivided into __,__,__. a、delay state b、ready state c、locked state d、suspended
93、what are the functions of aws iot core? a、connect devices to the cloud and other devices b、provide authentication and end-to-end encryption services at all connection points c、quickly filter and convert device data according to business rules d、store the latest status of connected devices
94、what are the advantages of wireless mesh networks? a、non-line-of-sight transmission b、robustness c、flexible structure d、quick deployment and easy installation
95、what are the reasons for the redesign and development of umesh by alios things? a、currently only supports 802.15.4 as the mac and phy layer protocol b、at present, various agreements are mainly for a specific business scenario c、currently does not support multiple different communication chip modules d、need to add support for mobile nodes
96、what types of semaphores in freertos can be divided into ？ a、binary semaphore b、counting semaphore c、mutually exclusive semaphore d、recursive mutex semaphore
97、which of the following are the functions of the perception and control layer in the iot architecture? a、perceive and recognize objects, collect and obtain information b、safely transmit information via bluetooth, wifi, etc. c、combine iot technology with vertical industry application scenarios to realize corresponding iot applications d、receive control instruction information, control and operate assets and equipment, etc.
98、what are the three levels of services provided by cloud computing? a、ias b、paas c、saas d、iaas
99、what are the functions provided by the application enabling platform aep? a、unified data storage b、machine learning c、application development d、basic big data analysis service
100、which statements about the execution environment of the resource management platform rmp are correct? a、divided into two categories according to the deployment location b、the managed execution environment is deployed inside the enterprise c、the resident execution environment allocates virtual computing, storage and network resources according to the needs of the application d、the resident execution environment is deployed inside the enterprise
101、which of the following are the advantages of alibaba cloud iot platform link platform? a、multiple protection capabilities can ensure device cloud security b、the high-performance iot hub can realize stable communication between devices and the cloud, and global multi-node deployment can effectively reduce communication delays c、provides rich device management functions, stable and reliable data storage capabilities, and rule engine capabilities d、help realize the flexible and rapid construction of iot applications
102、what protocols does alibaba cloud link platform currently support for device access? a、coap b、mqtt c、https d、xmpp
103、what are the two types of baidu's object access? a、product type b、application type c、device type d、data type
104、what are the advantages of the mqtt protocol? a、low overhead b、low bandwidth c、reliable d、two-way connection
105、what are the advantages of cloud-based development compared with traditional development? a、safe b、stable c、high performance d、easy to use
106、which of the following options are the advantages of serverless services a、users do not need to purchase hardware infrastructure b、users do not need to worry too much about system operation and maintenance c、users do not need to spend money d、users can pay according to the amount to improve resource utilization
107、what are the categories of iot studio service nodes a、function node b、function point c、device node d、storage node
108、what are the function computing nodes in iot studio service orchestration? a、java script b、node.js script c、python script d、go script
109、what storage nodes are supported by iot studio service orchestration? a、table storage b、cloud database mysql c、key-value pair operations d、hbase storage
110、what types of triggering methods does the iot studio service support? a、device attribute trigger b、device event trigger c、http request trigger d、timing trigger
111、what levels of log viewing does iot studio service orchestration provide a、node log b、global log c、web request log d、user-defined log
112、when a downstream node wants to obtain the value of an upstream node, which variables can be used to obtain it a、payload b、context c、target d、node
113、which development languages do web technology mainly rely on a、go b、html c、javascript d、css
114、which of the following statements about the javascript language is correct a、which of the following statements about the javascript language is correct b、javascript is a dynamic markup language used to describe the structure and frame of web pages c、javascript can be run directly in the browser d、javascript brings dynamic effects to the page by manipulating html and css content
115、how to jump to multiple pages in iot studio web visualization a、through the generated navigation menu b、jump through the click properties of the configuration component c、jump by binding keyboard keys d、jump by binding the mouse button
116、what kinds of components are included in web visualization development a、basic components b、control components c、form component d、chart component
117、what are the configuration items of the iot studio web visualization building component a、style b、data c、interactive d、locking
118、which of the following are the operating systems of mobile terminals a、android b、ios c、symbian d、windows phone
119、which of the following is not a process step for the visualization of iot studio app? a、configure service flow components b、scripting c、package build d、configure component style
120、which layers of the smart house are directly related to the internet of things? a、perception layer b、network layer c、platform layer d、application layer
121、in a mature iot architecture system, the system can be hierarchically divided according to different functions. which of the following is a common architecture a、perception layer b、network layer c、platform layer d、application layer
122、which of the following is part of the alibaba cloud iot platform device management service content a、life cycle b、object model c、data storage d、online debugging
123、the iot hub plays a vital role in the communication between devices and the internet of things. the communication methods it supports are ______. a、pub/sub b、rrpc c、nb-iot d、gprs
124、the iot hub plays a vital role in the communication between devices and the internet of things.the network access protocols he supports are ______. a、coap b、mqtt c、https d、rrpc
125、when programming devices in batches, one-type one-secret encryption can be used. in this encryption method, the information that needs to be programmed into the device is ______. a、productkey b、productsecret c、devicename d、devicesecret
126、link kit sdk adapts to multiple language environments to help developers establish a connection with the iot platform. the supported environments are ______. a、c sdk b、android sdk c、python sdk d、ios sdk
127、based on the open source mqtt access to the internet of things platform, the acceptable keep-alive time is set to ______. a、60s b、300s c、1000s d、5000s
128、during the life cycle of the device, the status of the device that can be seen is ______. a、inactivated b、online c、offline d、disable
129、which of the following is a rule engine function a、data flow b、scene linkage c、device authentication d、multi-protocol link
130、which of the following belongs to alibaba cloud iot platform tags a、product label b、device label c、group label d、attribute label
131、the contents of the equipment described by the tsl object model are ______. a、attributes b、service c、event d、authentication
132、in the pub/sub communication method, the actual content of an upload message should contain ______. a、topic b、payload c、attributes d、event
133、which of the following is a top-level iot application a、smart city b、smart life c、smart industry d、smart building
134、which layers of the smart house are directly related to the internet of things? a、perception layer b、network layer c、platform layer d、application layer
135、what are the main components of the smart house hardware system a、various environmental sensor modules b、various actuator modules c、arduino main control board module d、system power module, driver board and various peripheral devices
136、what are the main reasons for using arduino as the control platform for smart house? a、arduino popularity is high b、arduino is low cost c、rich arduino expansion modules d、arduino development is easy to get started
137、in general, what types of protocol interfaces are used for communication between various sensor modules and the main control board? a、iic b、spi c、tcp d、udp
138、the output interface is analog data, which of the following methods can be used a、adc b、dac c、pwm d、uart
139、what are the core components of the shared bicycle system a、electronic lock for shared bicycle b、user mobile app c、server running in the cloud d、solar panels for shared bicycles
140、during the information flow of the smart house, what protocols can the arduino main control module and the cloud platform communicate with? a、iic b、lora c、wifi d、nb-iot
141、in the smart house lighting scene, which actuators are connected with the photosensitive resistance sensor? a、pump b、air-conditioner c、light switch d、curtain motor
142、in the smart house combustible gas scene, which actuators are linked with combustible gas sensors a、ventilator b、pump c、beep d、curtain motor
143、in the smart house, the sensors that can trigger the ventilation of the ventilating fan under certain circumstances are a、temperature and humidity sensor b、pm2.5 sensor c、combustible gas sensor d、light sensor
144、what are the functions of the arduino main control module in the smart house? a、transfer data b、receive issued control commands c、collect sensor data d、interact with the user
145、in the shared bicycle iot application, which of the following are the functional modules of the bicycle? a、gps positioning b、data base c、communication module d、electronic control module
146、which of the executive agencies of the smart house are controlled by switches? a、air conditioning b、ventilator c、bump d、dimmable and adjustable led light
147、when the photoresistor in the smart house is in a high resistance state, the correct action of the following actuators is a、curtain closed b、curtains open c、lights on d、lights off
148、the cloud-integrated iot development model will greatly improve development efficiency.
149、alibaba iot kit is a hardware experimental device.
150、a typical iot system includes cloud platform, management layer, edge layer, terminal
151、software as a service (saas) is a cloud computing service product that allows users to access provider's cloud-based software.
152、platform as a service (paas) is a cloud computing service product that provides users with a cloud environment in which users can develop, manage, and deliver applications.
153、infrastructure as a service (iaas) is a cloud computing service product, and vendors will support users to access computing resources such as servers, storage, and networks.
154、the technology architecture of the internet of things includes sensing devices, access networks, core networks, data management platforms, applications and services.
155、the internet of things operating system alios things does not support air upgrades.
156、rfid is a contact type radio frequency identification technology.
157、the guard band deployment mode will not interfere with the current lte network
158、the feature of the non-ip data transmission scheme is that the network will not start the dedicated bearer context activation process
159、in the rel-13 version, the terminal only needs to support contention-based random access
160、an access platform process of nb-iot at the software level can be divided into platform domain and device domain
161、in lorawan, the two-way transmission terminal (class c) that maximizes the receiving time slot basically keeps the receiving window open, and only closes it briefly when sending.
162、the frequency bands used by lora are all above 1ghz.
163、lorawan two-way transmission terminal (class a) will follow two receiving windows immediately after sending data.
164、in lorawan, encryption can be performed at the network layer and application layer respectively.
165、the device address devaddr in lorawan consists of a 32-bit id that identifies the current network device, including nwkid and nwkaddr.
166、the strong anti-interference ability of lora technology is due to the use of spread spectrum communication.
167、the thing in the ability of the iot operating system to manage things refers to embedded real-time low-power devices.
168、in the absence of an operating system, the logic code usually takes the large loop while (1) as the foreground program and the interrupt service program as the background program
169、multi-tasking system is to provide running speed and work efficiency by performing multiple tasks at the same time
170、when the currently running task and the task running after the task switch are the same, the currently running task does not need to perform stack push and pop operations.
171、the semaphore is used by the operating system for resource management and task synchronization.
172、priority inheritance is used to ensure that the time for high-priority tasks to enter the blocking state is as short as possible, and to minimize the impact of priority inversion that has occurred.
173、device shadows can be used to store and retrieve information about the current state of objects.
174、the service manage module belongs to the kernel layer of udata.
175、the udata framework at the framework layer is mainly aimed at the integrated data model of the cloud and the pipe end, which can be uploaded to the cloud through the alink package for big data analysis.
176、when performing a firmware upgrade, the firmware version number entered on the iot platform is used for verification when the device reports the version number after the upgrade.
177、all nodes in the wireless mesh network are connected together, and there are multiple connection channels between any two nodes, and there is a clear decentralization trend.
178、the boneengine@lite engine in alios things can help developers use the javaseript language to develop iot applications.
179、liteos sdk is the huawei liteos software development kit. its functions include device-cloud interoperability components, fota, js engine, sensor framework, etc.
180、by combining iot technology with application scenarios in vertical industries, various iot applications can be realized, such as smart home, smart medical, smart transportation, smart agriculture, and so on.
181、iot devices can access the network through rfid technology
182、the machine learning function provided by the business analysis platform bap refers to the generation of a specific prediction model by training historical data to meet the logic of predictive or very complex analysis services.
183、devices can safely access the iot platform by integrating the iot hub provided by alibaba cloud link platform. the iot sdk component is responsible for helping devices connect to alibaba cloud iot, providing a secure channel for devices and the cloud to publish and receive data.
184、china mobile's onenet platform enables iot companies to focus more on application development, shorten the formation cycle of iot systems, and reduce the cost of enterprise r&d, operation, and operation and maintenance.
185、since the internet of things involves a variety of industries and generates massive amounts of data information and business control strategies, it faces huge challenges in terms of security and reliability. each internet of things platform also provides various security service mechanisms.
186、at present, the iot cloud platform focuses on device management and connection management functions, but with the advent of data torrents, the long-term competitive advantage of the iot platform will be around data, further collection, classification, processing, and analysis services.
187、the analog ports a0~a5 are fully equipped with the functions of digital ports.
188、both spi and iic protocols are divided into master-slave devices during communication, and the master-slave relationship is not fixed. generally, the master device that initiates communication is the slave device that is addressed.
189、in the spi protocol, the master device wakes up the slave device through a chip select signal.
190、the spi protocol is a half-duplex communication protocol.
191、the spi protocol requires at least three signal lines for unidirectional data transmission.
192、if the sensor module integrates a voltage comparator, the analog sensor can also work normally through the digital port.
193、the arduino development board was designed for students who have no professional electronic knowledge but who have embedded development needs.
194、the gas sensitive material used in the mq-5 sensor is low-priced silicon dioxide (sio2).
195、the photoresistor is made of semiconductor materials such as cadmium sulfide or cadmium selenide, and its working principle is based on the internal photoelectric effect.
196、wifi is the abbreviation of wireless fidelity, full name wireless fidelity, is a brand of wireless network communication technology.
197、arduino company adopts an open source strategy, anyone can use the company's development board design free of charge.
198、through emw3080, you can directly access the iot platform supported by the module.
199、iot studio supports device development, which is done directly by providing device firmware
200、iot studio can be connected to alibaba cloud database for data storage
201、in the iot studio service, there can only be one service flow in a service
202、the communication process between the virtual device and the platform in iot studio is no different from the real device, except that the data reported is simulated by the user
203、web visualization cannot build mobile pages
204、the page after web visualization can be bound with a custom domain name
205、a component can be bound to at least one interactive action
206、navigation menu can be automatically generated according to the page
207、you can directly interact with the device through the button component
208、iot studio can generate app applications for both android and ios platforms at the same time
209、the data configuration items of the app visualization component can be directly linked to the attribute data reported by the device
210、app visualization can preview the presentation of the development page on mobile devices in real time
211、in the app visualization component, the button component can directly set the property value of the object by configuring the action property, thereby controlling the device
final exam (subjective questions)
1、please briefly describes the layered architecture of the internet of things system, briefly explains the functions of each layer, and discusses the technology application of each layer，the hardware and software components of each layer in the diy smart house case in combination with the course content.
2、briefly describe how mqtt works. in the smart house case, how can mqtt be used to implement an application and device interaction process?
3、briefly describe the technical characteristics of lora and nb-iot, what similarities and differences do they have in common, and what are the suitable application scenarios of lora and nb-iot in life?