ID int64 1 1.96k | Split stringclasses 1
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values | SubDomain stringclasses 24
values | Format stringclasses 1
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value | Question stringlengths 15 717 | A stringlengths 1 292 | B stringlengths 1 232 | C stringlengths 1 217 | D stringlengths 1 192 | Answer stringclasses 4
values | Explanation stringlengths 21 1.43k ⌀ |
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1,370 | Test | Computer Network | Transport Layer | Multiple-choice | Knowledge | English | The ( ) field is included in the TCP header but not in the UDP header. | Destination Port Number | Serial number | Checksum | Destination IP address | B | null |
1,371 | Test | Computer Network | Transport Layer | Multiple-choice | Knowledge | English | In TCP communication, when one party sends a segment with the FIN flag, it indicates ( ). | Terminate the TCP connection between the two communicating parties. | Unilateral release of connection indicates that the party has no more data to send but can receive data from the other party. | Cease data transmission; neither party can send data. | The connection has been re-established. | B | null |
1,372 | Test | Computer Network | Transport Layer | Multiple-choice | Reasoning | English | In the OSI reference model, the layer that provides end-to-end transparent data transmission services, error control, and flow control is ( ). | Physical Layer | Network Layer | Transport Layer | Session Layer | C | In the OSI reference model, the layer that provides end-to-end transparent data transmission services, error control, and flow control is the **Transport Layer (C)**. The main functions of the Transport Layer include ensuring data integrity and correct sequencing, providing reliable communication services (such as TCP)... |
1,373 | Test | Computer Network | Transport Layer | Multiple-choice | Reasoning | English | The characteristics of connection-oriented services in the transport layer are ( ). | Does not guarantee reliable and ordered delivery | Does not guarantee reliability but ensures ordered delivery. | Guaranteed reliable but not guaranteed in-order delivery | Ensure reliable and sequential delivery | D | Connection-oriented services refer to the requirement for communication parties to establish a complete connection before communication can commence. During the communication process, the entire connection can be monitored and managed in real-time. After communication is completed, the connection is released. Connectio... |
1,374 | Test | Computer Network | Transport Layer | Multiple-choice | Reasoning | English | In reliable transmission protocols, "reliable" refers to ( ). | Using connection-oriented sessions | Best-effort delivery | Use a sliding window to maintain reliability. | Employ a confirmation mechanism to ensure that transmitted data is not lost. | D | If a protocol uses an acknowledgment mechanism to confirm the data transmitted, it can be considered a reliable protocol; if a protocol adopts a "best-effort" approach to transmission, then it is unreliable. For example, TCP provides acknowledgments for transmitted segments, making it a reliable transport protocol, whe... |
1,375 | Test | Computer Network | Transport Layer | Multiple-choice | Reasoning | English | Which of the following well-known TCP port numbers is incorrect? () | TELNET:23 | SMTP:25 | HTTP:80 | FTP:24 | D | The port for FTP control connection is 21, and the port for data connection is 20. |
1,376 | Test | Computer Network | Transport Layer | Multiple-choice | Reasoning | English | Assuming an application generates a 60B data block per second, each data block is encapsulated in a TCP segment and then encapsulated in an IP datagram. The percentage of the final datagram that consists of application data is ( ). | 0.2 | 0.4 | 0.6 | 0.8 | C | In this question, the header length of a TCP segment is 20B, and the header length of an IP datagram is also 20B. With an additional 60B of data, the total length of an IP datagram is 100B, from which we can deduce that the data accounts for 60%. |
1,377 | Test | Computer Network | Transport Layer | Multiple-choice | Reasoning | English | For network applications using UDP, the reliability of data transmission is the responsibility of ( ). | Transport Layer | Application Layer | Data Link Layer | Network Layer | B | UDP itself cannot guarantee the reliability of transmission, and since UDP is end-to-end based and characterized by best-effort delivery, it cannot provide reliable transmission at the network and data link layers. Therefore, reliable transmission can only be achieved through application layer protocols. |
1,378 | Test | Computer Network | Transport Layer | Multiple-choice | Reasoning | English | The following description of the main characteristics of the UDP protocol is incorrect ( ) | The UDP header mainly includes fields such as port numbers, length, and checksum. | The UDP length field represents the length of the UDP datagram, including the length of the pseudo header. | The UDP checksum performs verification on the pseudo header, UDP datagram header, and application layer data. | The pseudo-header includes a part of the IP datagram header. | B | The pseudo-header is only temporarily added when calculating the checksum and is not included in the length of UDP. For option D, the pseudo-header includes the source IP and destination IP, which are part of the IP packet header. |
1,379 | Test | Computer Network | Transport Layer | Multiple-choice | Reasoning | English | The handling method when the receiver receives UDP user data with errors is () | Discard | Request for retransmission | Error Correction | Ignore errors | A | If the receiver detects an error in the data through verification, it will directly discard the datagram. |
1,380 | Test | Computer Network | Transport Layer | Multiple-choice | Reasoning | English | The following statement about UDP checksum is incorrect ( ) | The checksum function of UDP is not mandatory and can be unused. | If the UDP checksum calculation result is 0, then 0 is filled in the checksum field. | The calculation of the UDP checksum field includes a pseudo-header, UDP header, and the carried payload data. | The calculation method for UDP checksum is to sum the binary complement and then take the complement again. | B | The checksum for UDP is not mandatory; if the checksum is not used, then the checksum field should be set to 0. However, if the calculated result of the checksum happens to be 0, then the checksum field should be set to all ones. |
1,381 | Test | Computer Network | Transport Layer | Multiple-choice | Reasoning | English | Among the following descriptions of UDP checksum, ( ) is incorrect. | The use of the UDP checksum field is optional. If the source host does not wish to compute the checksum, then this checksum field should be all zeros. | During the process of calculating the checksum, a pseudo-header needs to be generated. The source host must send this pseudo-header to the destination host. | If the datagram is corrupted during transmission, then discard it. | The pseudo-header of a UDP datagram includes IP address information. | B | The pseudo-header of a UDP datagram includes IP address information, but it is only constructed during the checksum calculation and is not transmitted. |
1,382 | Test | Computer Network | Transport Layer | Multiple-choice | Reasoning | English | The following networks are not suitable for using the UDP protocol: | Client/server domain | Remote Invocation | Real-time Multimedia Applications | Remote Login | D | UDP is characterized by low overhead, good timing performance, and ease of implementation. In the client/server model, the requests between them are very short, and using UDP is not only simple in coding but also requires very few messages. The reasons for using UDP in remote procedure calls are the same as in the clie... |
1,383 | Test | Computer Network | Transport Layer | Multiple-choice | Reasoning | English | The following description of connection-oriented protocols in the transport layer is ( ) incorrect. | Connection-oriented services require three stages: connection establishment, data transfer, and connection release. | When no errors occur on the link, connection-oriented services can guarantee that the data arrives in the correct order. | Connection-oriented services offer high efficiency and temporal performance. | Connection-oriented services provide a reliable data stream. | C | Since connection-oriented services require the establishment of a connection and need to ensure the order and correctness of data, they have a higher overhead compared to connectionless services, and are also slower and less efficient than connectionless services. |
1,384 | Test | Computer Network | Transport Layer | Multiple-choice | Reasoning | English | The following ( ) is not a characteristic of TCP services. | Byte stream | Full Duplex | Reliable | Supports broadcasting | D | TCP provides a one-to-one, full-duplex, reliable byte stream service, thus TCP does not support broadcasting. |
1,385 | Test | Computer Network | Transport Layer | Multiple-choice | Reasoning | English | The following description of the TCP header format is incorrect ( ). | The header length is 20-60B, with a fixed part of 20B. | The port number fields sequentially represent the source port number and the destination port number. | The header length is always a multiple of 4 bytes. | The protocol field in the IP header of the pseudo-header for TCP checksum calculation is 17. | D | The TCP pseudo-header, like the UDP pseudo-header, includes a part of the IP datagram header. There is a protocol field in the IP header that indicates whether the upper-layer protocol is TCP or UDP. 17 represents UDP, while 6 represents TCP, so option D is incorrect. For option A, since the unit of the Data Offset fie... |
1,386 | Test | Computer Network | Transport Layer | Multiple-choice | Reasoning | English | During the data transmission phase using a TCP connection, if the sender's send window value changes from 1000 to 2000, the sender can send () | 2000 TCP segments | 2000B | 1000B | 1000 TCP segments | B | TCP uses a sliding window mechanism for flow control. In the ACK response, TCP sends back to the sender the maximum value of the range of data that the receiver is willing to accept, indicated by ACK, which the sender takes as the send window value. This value represents the maximum number of bytes that the sender can ... |
1,387 | Test | Computer Network | Transport Layer | Multiple-choice | Reasoning | English | When A receives an acknowledgment segment with an acknowledgment number of 100, it indicates that | Segment 99 received | Segment 100 has been received. | The message segment with the last byte sequence number of 99 has been received. | The message segment with a final byte sequence number of 100 has been received. | C | The acknowledgment number in TCP indicates the sequence number of the first byte of the data segment that the receiver expects to receive next. It can be seen that the sequence number of the last byte of the previously received segment is 99, so option C is correct. |
1,388 | Test | Computer Network | Transport Layer | Multiple-choice | Reasoning | English | The following description of the TCP working principle and process is incorrect ( ). | The process of establishing a TCP connection requires a "three-way handshake." | After the TCP connection is established, the application processes on the client and server sides perform full-duplex byte stream transmission. | The process of releasing a TCP connection is complex, and only the client can actively initiate a request to release the connection. | The release of a TCP connection requires a "four-way handshake" process. | C | Either of the two processes involved in a TCP connection can initiate a request to release the connection. |
1,389 | Test | Computer Network | Transport Layer | Multiple-choice | Reasoning | English | In the TCP sliding window protocol, the maximum number of packets that can be retransmitted is ( ). | is arbitrary | one | Greater than the size of the sliding window | Equal to the size of the sliding window. | D | In the TCP sliding window protocol, the size of the sender's sliding window determines the maximum number of packets the sender can transmit. The sender can only continue to send more packets after the window has slid. The maximum value for packet retransmission is also the maximum amount of data the sender can send, t... |
1,390 | Test | Computer Network | Transport Layer | Multiple-choice | Reasoning | English | The following description of TCP window and congestion control concepts is incorrect ( ). | The receiver window (rwnd) notifies the sender of the data through the window field in the TCP header. | The basis for determining the send window is: Send Window = min[Receive Window, Congestion Window]. | The congestion window is a window value determined by the receiver based on the network congestion conditions. | The size of the congestion window can grow exponentially at the beginning. | C | The congestion window is a window value determined by the sender based on the network congestion condition. |
1,391 | Test | Computer Network | Transport Layer | Multiple-choice | Reasoning | English | In the TCP "three-way handshake" process, during the second "handshake," the () flag bit is set to 1. | SYN | ACK | SYN and ACK | ACK and RST | C | In TCP's "three-way handshake," during the second handshake, both SYN and ACK are set to 1. |
1,392 | Test | Computer Network | Transport Layer | Multiple-choice | Reasoning | English | A and B have established a TCP connection. A sends a segment to B with the sequence number field seq=200, acknowledgment number field ack=201, and 2 bytes of data. In B's acknowledgment segment for this message, ( ) | seq = 202, ack = 200 | seq = 201, ack = 201 | seq = 201, ack = 202 | seq=202, ack=201 | C | In the message (with acknowledgment) sent from B to A, the seq value should be the same as the ack value in the message sent from A to B, which is 201; the ack value indicates the number B expects for the first byte of the next segment sent by A, which should be 200+2=202. |
1,393 | Test | Computer Network | Transport Layer | Multiple-choice | Reasoning | English | During the data transmission phase of a TCP connection, if the sender's send window size changes from 2000 to 3000, it means that the sender can ( ). | Up to 3000 TCP segments can be sent before receiving an acknowledgment. | Before receiving an acknowledgment, 1000B can be sent. | Up to 3000B can be sent before receiving an acknowledgment. | Before receiving an acknowledgment, 2000 TCP segments can be sent. | C | TCP provides a reliable byte stream transmission service, using a window mechanism for flow control and congestion control. The sliding window mechanism of TCP is byte-oriented, hence the unit of window size is bytes. Assuming the size of the send window is N, this means that the sender can continuously send N bytes wi... |
1,394 | Test | Computer Network | Transport Layer | Multiple-choice | Reasoning | English | In a TCP connection with an MSS of 1KB, a timeout event occurs when the congestion window is 34KB. If the transmission of segments is successful in the next 4 RTTs, then after all these segments are acknowledged, the size of the congestion window is ( ). | 8KB | 9KB | 16KB | 17KB | C | Upon a timeout with a congestion window of 34KB, the slow start threshold (ssthresh) is set to 17KB, and the congestion window (cwnd) is set to 1KB for the first RTT. Following the slow start algorithm, in the second RTT cwnd=2KB, in the third RTT cwnd=4KB, and in the fourth RTT cwnd=8KB. After receiving acknowledgment... |
1,395 | Test | Computer Network | Transport Layer | Multiple-choice | Reasoning | English | The initial slow start threshold value of the TCP congestion window is 8 (in segments). When the congestion window increases to 12 and a timeout occurs, TCP begins slow start and congestion avoidance. Therefore, the size of the congestion window at the 13th transmission is ( ). | 4 | 6 | 7 | 8 | C | In the slow start and congestion avoidance algorithms, the congestion window initially starts at 1, and the window size begins to grow exponentially. When the congestion window exceeds the slow start threshold, the slow start algorithm is no longer used, and the congestion avoidance algorithm is adopted instead. The in... |
1,396 | Test | Computer Network | Transport Layer | Multiple-choice | Reasoning | English | In a TCP connection with an MSS of 1KB, upon receiving 3 duplicate ACKs when the congestion window is 34KB, if the transmission of segments is successful in the next 4 RTTs, then after all these segments are acknowledged, the size of the congestion window is ( ). | 8KB | 16KB | 20KB | 21KB | D | The condition "receiving 3 duplicate ACK packets" indicates that the fast recovery should be initiated, thus the threshold is set to 17KB, and the cwnd is also set to 17KB for the following first RTT. In the second RTT, cwnd=18KB; in the third RTT, cwnd=19KB; in the fourth RTT, cwnd=20KB. After all packets sent in the ... |
1,397 | Test | Computer Network | Transport Layer | Multiple-choice | Reasoning | English | Assuming that there is no congestion, using the slow start control strategy on a line with a round-trip time (RTT) of 10ms. If the receive window size is 24KB and the maximum segment size (MSS) is 2KB, the time required for the sender to send out the first full window (i.e., the send window reaches 24KB) is ( ). | 30ms | 40ms | 50ms | 60ms | B | According to the slow start algorithm, the initial value of the send window is the initial value of the congestion window, which is the size of the MSS, 2KB. It then increases successively to 4KB, 8KB, 16KB, and finally to the size of the receive window, 24KB, reaching the first full window. Therefore, the time require... |
1,398 | Test | Computer Network | Transport Layer | Multiple-choice | Reasoning | English | If a process on host 1 establishes a TCP connection with port x and host 2 with port y, then if one wishes to establish another TCP connection between these two ports, it would be ( ). | Connection establishment failed, does not affect the transmission of previously established connections. | Establishment successful, and both connections can transmit normally. | Connection established successfully; the previously established connection has been disconnected. | Connection establishment failed; both connections were disconnected. | A | A connection is represented using their sockets, thus (1, x)-(2, y) is the only possible connection between the two. Subsequent connections will be blocked. |
1,399 | Test | Computer Network | Application Layer | Multiple-choice | Knowledge | English | UDP is a type of (). | Connection-oriented protocol | Byte-oriented protocol | Connectionless Protocol | Reliable Transmission Protocol | C | null |
1,400 | Test | Computer Network | Application Layer | Multiple-choice | Knowledge | English | One of the characteristics of the UDP protocol is? () | Connection-oriented | Congestion control | The overhead of the header is relatively large. | Connectionless | D | null |
1,401 | Test | Computer Network | Application Layer | Multiple-choice | Knowledge | English | What is TCP flow control achieved through? () | Window mechanism | Sliding Window | Congestion Control | Timeout Retransmission | B | null |
1,402 | Test | Computer Network | Application Layer | Multiple-choice | Knowledge | English | Why is it necessary to wait for 2MSL? () | Waiting for the server to release the connection | Waiting for the client to release the connection | Waiting for the final ACK | Waiting for the last message | D | null |
1,403 | Test | Computer Network | Application Layer | Multiple-choice | Knowledge | English | One of the differences between TCP and UDP is? () | TCP is a connectionless protocol | UDP is a connectionless protocol. | TCP provides no congestion control. | UDP header overhead is relatively large. | B | null |
1,404 | Test | Computer Network | Application Layer | Multiple-choice | Knowledge | English | What are the basic principles of reliable transmission? () | Error detection, acknowledgment, retransmission, sequencing | Flow control, congestion control, window mechanism, timeout retransmission. | Checksum, Sliding Window, Slow Start, Fast Retransmit | CRC check, Stop-and-Wait protocol, Slow Start, Fast Recovery | A | null |
1,405 | Test | Computer Network | Application Layer | Multiple-choice | Knowledge | English | In the TCP protocol, what mechanism resolves the issue of data loss? () | Window mechanism | Sliding Window | Timeout Retransmission | Congestion Control | C | null |
1,406 | Test | Computer Network | Application Layer | Multiple-choice | Knowledge | English | In TCP's reliable transmission mechanism, how is the acknowledgment of received data by the receiver handled? () | Acknowledgment Number | Congestion Control | Retransmitted data | Window Adjustment | A | null |
1,407 | Test | Computer Network | Application Layer | Multiple-choice | Knowledge | English | What are the characteristics of the slow start algorithm in congestion control? () | The congestion window grows exponentially from 1. | Enter congestion avoidance when the threshold is reached. | Timeout threshold halved | Unaffected by congestion control | A | null |
1,408 | Test | Computer Network | Application Layer | Multiple-choice | Knowledge | English | One characteristic of the UDP protocol is? () | Congestion control | Connectionless Protocol | Provide reliable transmission | Connection-oriented | B | null |
1,409 | Test | Computer Network | Application Layer | Multiple-choice | Knowledge | English | What does the DNS protocol resolve? () | IP address to MAC address | Domain Name to IP Address | Port Number to Application Layer Protocol | Subnet Mask to Network ID | B | null |
1,410 | Test | Computer Network | Application Layer | Multiple-choice | Knowledge | English | In the FTP protocol, on which port is the data connection for file transfer established? () | 20 | 21 | 22 | 23 | A | null |
1,411 | Test | Computer Network | Application Layer | Multiple-choice | Knowledge | English | What protocol is used by the client to send emails? () | POP3 | IMAP | SMTP | HTTP | C | null |
1,412 | Test | Computer Network | Application Layer | Multiple-choice | Knowledge | English | What is the process of finding a DNS server in the sequence of domain name resolution? () | Local machine's hosts file -> Browser cache -> Routing cache -> DNS server | Local machine hosts file -> Routing cache -> Browser cache -> DNS server | Browser Cache -> Local hosts file -> Routing Cache -> DNS Server | Routing Cache -> DNS Server -> Local hosts file -> Browser Cache | C | null |
1,413 | Test | Computer Network | Application Layer | Multiple-choice | Knowledge | English | Which protocol does HTTPS rely on to provide encrypted data processing, identity verification, and data integrity protection? () | FTP | TLS | DNS | SNMP | B | null |
1,414 | Test | Computer Network | Application Layer | Multiple-choice | Knowledge | English | In the order of domain name resolution, where is the browser cache queried? () | First | Second | The third | Section Four | A | null |
1,415 | Test | Computer Network | Application Layer | Multiple-choice | Knowledge | English | What is the port number for the DHCP protocol? () | 21 | 53 | 67 | 80 | C | null |
1,416 | Test | Computer Network | Application Layer | Multiple-choice | Knowledge | English | In the HTTP protocol, which version introduced persistent connections (Keep-Alive)? () | HTTP/1.0 | HTTP/1.1 | HTTP/2.0 | HTTP/3.0 | B | null |
1,417 | Test | Computer Network | Application Layer | Multiple-choice | Knowledge | English | In the sequence of DNS resolving a domain name, which step involves a recursive query? () | Browser Cache | The local hosts file | Routing Cache | Find DNS server | D | null |
1,418 | Test | Computer Network | Application Layer | Multiple-choice | Knowledge | English | Among the following statements about the client/server model, the incorrect one is ( ). | Servers are dedicated to performing certain services, while clients act as consumers of these services. | The client is typically located at the front-end, while the server is usually at the back-end. | Clients and servers collaborate on computing tasks through the network. | The client is task-oriented, while the server is user-oriented. | D | null |
1,419 | Test | Computer Network | Application Layer | Multiple-choice | Knowledge | English | Domain names have a one-to-one correspondence with (). | IP address | MAC address | Host | None of the above | D | null |
1,420 | Test | Computer Network | Application Layer | Multiple-choice | Knowledge | English | The following statement is incorrect ( ) | The host that provides customer access on the Internet must have a domain name. | The same domain name may resolve to different IP addresses at different times. | Multiple domain names can point to the same host IP address. | Hosts within an IP subnet can be maintained by different domain name servers for their mapping. | A | null |
1,421 | Test | Computer Network | Application Layer | Multiple-choice | Knowledge | English | DNS is a distributed system based on the () model. | C/S | B/S | P2P | None of the above is correct. | A | null |
1,422 | Test | Computer Network | Application Layer | Multiple-choice | Knowledge | English | The components of the Domain Name System (DNS) do not include ( ). | Domain space | Distributed Database | Domain Name Server | Translation program from internal IP addresses to external IP addresses | D | null |
1,423 | Test | Computer Network | Application Layer | Multiple-choice | Knowledge | English | ( ) can convert the hostnames it governs into the IP addresses of the hosts. | Local Domain Name Server | Root Domain Name Server | Authoritative Domain Name Server | Proxy Domain Name Server | C | null |
1,424 | Test | Computer Network | Application Layer | Multiple-choice | Knowledge | English | The following statements about FTP connections, the correct one is () | The control connection is established before the data connection and is released prior to the data connection. | The data connection is established before the control connection and is released prior to the control connection. | The control connection is established before the data connection and is released after the data connection. | The data connection is established before the control connection and is released after the control connection. | C | null |
1,425 | Test | Computer Network | Application Layer | Multiple-choice | Knowledge | English | Anonymous FTP access typically uses () as the username. | guest | E-mail address | anonymous | Host ID | C | null |
1,426 | Test | Computer Network | Application Layer | Multiple-choice | Knowledge | English | The format of an Internet user's email address must be ( ). | Username@host network name | Unit network name @username | The domain name of the host where the email resides @ username | Username at the domain of the email host. | D | null |
1,427 | Test | Computer Network | Application Layer | Multiple-choice | Knowledge | English | When sending emails through Gmail using Firefox, the protocol used is ( ). | HTTP | POP3 | P2P | SMTP | A | null |
1,428 | Test | Computer Network | Application Layer | Multiple-choice | Knowledge | English | Among the following statements about email format, the incorrect one is ( ) | The content of an email includes two parts: the email header and the email body. | The sender's address (From:), sending time, recipient's address (To:), and email subject (Subject:) in the email header are automatically generated by the system. | The body of the email is the actual content of the letter to be sent. | MIME enables email systems to transmit various types of information such as text, images, audio, and video. | B | null |
1,429 | Test | Computer Network | Application Layer | Multiple-choice | Knowledge | English | When retrieving a World Wide Web document from a known URL, if the IP address of the web server is initially unknown, the application layer protocol required is (). | FTP and HTTP | DNS and FTP | DNS and HTTP | TELNET and HTTP | C | null |
1,430 | Test | Computer Network | Application Layer | Multiple-choice | Knowledge | English | HTTP is a stateless protocol, however, websites often wish to identify users, which requires the use of ( ). | Web Cache | Cookie | Conditional GET | Persistent Connection | B | null |
1,431 | Test | Computer Network | Application Layer | Multiple-choice | Knowledge | English | Among the following statements about Cookies, the incorrect one is ( ). | Cookies are stored on the server side. | Cookies are generated by the server. | Cookies can threaten customer privacy. | The function of a cookie is to track user visits and status. | A | null |
1,432 | Test | Computer Network | Application Layer | Multiple-choice | Reasoning | English | The following description of the client/server model contains errors ( ). I. The client must know the server's address in advance, while the server does not need to know the client's address in advance. II. The client mainly implements how to display information and collect user input, while the server mainly processes... | I, IV | III, IV | Only IV | Only IIII | C | Before the connection is established, the server listens on a certain port. The client is the party requesting the connection and must know the server's address in advance to send a connection request, while the server obtains the client's address from the data packets sent by the client. Once the connection is establi... |
1,433 | Test | Computer Network | Application Layer | Multiple-choice | Reasoning | English | The following description of the P2P concept is incorrect (). | P2P is a working mode where network nodes exchange information directly with each other in a peer-to-peer manner. | The P2P communication model refers to the direct communication capability between peer nodes in a P2P network. | P2P network refers to a physical network constructed parallel to the Internet, consisting of peer nodes. | P2P implementation technology refers to the protocols, software, etc., designed to enable direct communication between peer nodes. | C | Option C's statement that "P2P network is a kind of physical network" is incorrect. P2P network refers to an Overlay Network composed of peer nodes on the Internet, which is a dynamic logical network. Additionally, the ability for peer nodes to communicate directly with each other is a prominent feature of P2P. |
1,434 | Test | Computer Network | Application Layer | Multiple-choice | Reasoning | English | In the Internet, domain name resolution relies on a logical tree composed of domain name servers. During the domain name resolution process, the software requesting domain name resolution on the host does not need to know the ( ) information. I. IP of the local domain name server II. IP of the parent node of the local ... | Type I and Type II | I and III | II and III | I, II, and III | C | Under normal circumstances, a client only needs to send a domain name resolution request to the local domain name server, which handles everything else and returns the final result to the client. Therefore, the host only needs to know the IP of the local domain name server. |
1,435 | Test | Computer Network | Application Layer | Multiple-choice | Reasoning | English | In DNS recursive queries, the address is returned to the client by ( ). | The initially connected server | The last connected server | Destination server address | uncertain | A | In a recursive query, each server that does not contain the requested information will refer to another location to search, and then send the results back, so the server that the client initially connected to will ultimately return the correct information. |
1,436 | Test | Computer Network | Application Layer | Multiple-choice | Reasoning | English | A host machine looking to resolve the IP address for www.baidu.com, if configured with the domain name server 202.120.66.68, the internet top-level domain server at 11.2.8.6, and the domain name server holding the IP address mapping for www.baidu.com at 202.113.16.10, would typically first query (). | 202.120.66.68 domain name server | 11.2.8.6 Domain Name Server | 202.113.16.10 domain name server | You may choose any one from these three domain name servers. | A | When this host sends a DNS query message for www.baidu.com, the query message is first sent to the host's local domain name server at 202.120.66.68. If the local domain name server cannot immediately respond to the query, it will query a root domain name server as a DNS client. However, regardless of the method of quer... |
1,437 | Test | Computer Network | Application Layer | Multiple-choice | Reasoning | English | Among the following statements about FTP, the incorrect one is () | FTP can transfer files between different types of operating systems. | FTP is not suitable for sharing files with read-write access between two computers. | The control connection is maintained throughout the entire FTP session. | The client by default uses port 20 to establish a data transfer connection with the server. | D | After the control connection is established, the server process uses its well-known port 20 to establish a data transfer connection with the port number provided by the client process, that is, the port number of the client process is provided by the client process itself. |
1,438 | Test | Computer Network | Application Layer | Multiple-choice | Reasoning | English | When a user agent can only send but not receive emails, it may be due to an incorrect ( ) address. | POP3 | SMTP | HTTP | Mail | A | The user agent receives emails using the POP3 protocol. Typically, when configuring an email user agent, it is necessary to set the mail server's POP3 address (such as pop3.gmail.com). If this address is set incorrectly, it will result in the user being unable to receive emails. An incorrect SMTP address in the user ag... |
1,439 | Test | Computer Network | Application Layer | Multiple-choice | Reasoning | English | The following statement about the POP3 protocol is ( ) incorrect. | Whether to save emails on the server after receiving them is chosen by the client rather than the server. | After logging into the server, the password sent is encrypted. | The protocol is based on ASCII code and cannot send binary data. | An account can only have one mail receiving directory on the server. | B | The POP3 protocol uses plaintext for password transmission at the transport layer and does not encrypt the password, so option B is incorrect. The POP3 protocol is based on ASCII code, and if non-ASCII data needs to be transmitted, MIME must be used to convert the data into ASCII format. |
1,440 | Test | Computer Network | Application Layer | Multiple-choice | Reasoning | English | In the following () protocol, the client and server communicate using a connectionless-oriented protocol. | FTP | SMTP | DNS | HTTP | C | DNS uses UDP to transmit data, and UDP is a connectionless-oriented protocol. |
1,441 | Test | Computer Network | Application Layer | Multiple-choice | Reasoning | English | From the perspective of protocol analysis, the first step of WWW service is the browser's request to the server (). | Request for Address Resolution | Establishment of Transmission Connection | Request for domain name resolution | Session Connection Establishment | C | To establish a connection between the browser and the server, it is necessary to know the server's IP address and port number (port 80 is a well-known port). When accessing a site, the browser receives the domain name of the WWW site from the user, so the browser must first request a domain name resolution from the DNS... |
1,442 | Test | Computer Network | Application Layer | Multiple-choice | Reasoning | English | When clicking on a World Wide Web document with a mouse, if the document contains text and three gif images, () UDP connections and () TCP connections need to be established in HTTP/1.0. | 0, 4 | 1, 3 | 0, 2 | 1, 2 | A | HTTP uses TCP at the transport layer, so there is no need to establish a UDP connection. HTTP/1.0 only supports non-persistent connections, which means that each request for an object requires establishing a TCP connection. In the scenario of this question, a total of 1 basic HTML object and 3 gif objects need to be tr... |
1,443 | Test | Computer Network | Application Layer | Multiple-choice | Reasoning | English | Among the following descriptions of the characteristics of non-persistent HTTP connections, the incorrect one is ( ). | HTTP supports non-persistent connections and persistent connections. | HTTP/1.0 uses non-persistent connections, while the default mode for HTTP/1.1 is persistent connections. | For each request/response in a non-persistent connection, a new TCP connection must be established. | Reading a web page containing 100 image objects in a non-persistent connection requires opening and closing 100 TCP connections. | D | In non-persistent connections, reading a web page containing 100 image objects requires opening and closing 101 TCP connections, not 100. |
1,694 | Test | Operating System | Overview | Multiple-choice | Knowledge | English | Users can utilize computers in two ways (). | Command Interface and Functions | Command Interface and System Calls | Command Interface and File Management | Device management methods and system calls | B | null |
1,695 | Test | Operating System | Overview | Multiple-choice | Knowledge | English | To facilitate users in directly or indirectly controlling their jobs, the operating system provides a command interface, which can be further divided into (). | Online User Interface and Offline User Interface | Programmatic Interface and Graphical Interface | Online User Interface and Program Interface | Offline User Interface and Graphical Interface | A | null |
1,696 | Test | Operating System | Overview | Multiple-choice | Knowledge | English | An important performance aspect of a time-sharing system is the system's response time. Improving factors related to the operating system () can help enhance the system's response time. | Increase the time slice | Adopt static paging management. | Priority + Non-preemptive Scheduling Algorithm | Code Reentrancy | C | null |
1,697 | Test | Operating System | Overview | Multiple-choice | Knowledge | English | In the operating system, the instructions that can only be executed in kernel mode are (). | Read Clock Instruction | Set Clock Instruction | Fetch instruction | Clearing the register | B | null |
1,698 | Test | Operating System | Overview | Multiple-choice | Knowledge | English | Among the following options, () is not an issue of concern for the operating system. | Manage bare-metal computers | Design and provide an interface between user programs and hardware systems. | Manage computer system resources | Compiler for High-Level Programming Languages | D | null |
1,699 | Test | Operating System | Overview | Multiple-choice | Knowledge | English | The basic function of an operating system is (). | Provide powerful network management tools. | Provide a user interface to facilitate user operation. | Provide a convenient visual editing program. | Control and manage various resources within the system. | D | null |
1,700 | Test | Operating System | Overview | Multiple-choice | Knowledge | English | The two most fundamental characteristics of modern operating systems are (). | Concurrency and Uncertainty | Concurrency and Sharing | Shared and Virtual | Virtual and Uncertain | B | null |
1,701 | Test | Operating System | Overview | Multiple-choice | Knowledge | English | The following statement about concurrency is correct (). | Concurrency refers to the occurrence of several events at the same moment. | Concurrency refers to the occurrence of several events at different moments in time. | Concurrency refers to the occurrence of several events within the same time interval. | Concurrency refers to several events occurring within different time intervals. | C | null |
1,702 | Test | Operating System | Overview | Multiple-choice | Knowledge | English | System calls are provided by the operating system to users, and they (). | Directly use through keyboard interaction method | Can only be used indirectly through user programs | is a command in the command interface | Just like the system's commands | B | null |
1,703 | Test | Operating System | Overview | Multiple-choice | Knowledge | English | The user attempts to read the 100th logical block of a file in the program, using the () interface provided by the operating system. | system call | Keyboard command | Original language | Graphical User Interface (GUI) | A | null |
1,704 | Test | Operating System | Overview | Multiple-choice | Knowledge | English | The communication interface between the operating system and the user typically does not include (). | shell | Command Interpreter | Generalized Instruction | Cache Management Instructions | D | null |
1,705 | Test | Operating System | Overview | Multiple-choice | Knowledge | English | The key technology to improve the utilization rate of single-machine resources is (). | Offline technology | Virtual Technology | Exchange Technology | Multiprogramming technique | D | null |
1,706 | Test | Operating System | Overview | Multiple-choice | Knowledge | English | The main disadvantage of batch processing systems is (). | The system has a low throughput. | CPU utilization is not high. | Low resource utilization rate | Non-interactive capability | D | null |
1,707 | Test | Operating System | Overview | Multiple-choice | Knowledge | English | Among the following options, the one that does not belong to the basic characteristics of multiprogramming is (). | Restrictive | intermittent | Sequentiality | Sharedness | C | null |
1,708 | Test | Operating System | Overview | Multiple-choice | Knowledge | English | The basic types of operating systems mainly include (). | Batch processing operating system, time-sharing operating system, and multitasking system. | Batch processing operating system, time-sharing operating system, and real-time operating system. | Single-user system, multi-user system, and batch processing operating system. | Real-time operating system, time-sharing operating system, and multi-user system. | B | null |
1,709 | Test | Operating System | Overview | Multiple-choice | Knowledge | English | Real-time operating systems must process events from the outside within (). | one machine cycle | Controlled object specified time | Turnaround Time | time slice | B | null |
1,710 | Test | Operating System | Overview | Multiple-choice | Knowledge | English | () is not the primary goal pursued in designing real-time operating systems. | Safe and reliable | Resource Utilization Rate | Timely Response | Rapid processing | B | null |
1,711 | Test | Operating System | Overview | Multiple-choice | Knowledge | English | The goal of a time-sharing system is (). | Make full use of I/O devices. | Quickly respond to users | Increase system throughput | Make full use of memory | B | null |
1,712 | Test | Operating System | Overview | Multiple-choice | Knowledge | English | In a time-sharing system, the longer the time slice, the () longer the response time. | The more memory | The less memory | The more users | The fewer the number of users | C | null |
1,713 | Test | Operating System | Overview | Multiple-choice | Knowledge | English | Among the various functional components of the following operating systems, () may not require hardware support. | Process Scheduling | Clock Management | Address Mapping | Interrupt System | A | null |
1,714 | Test | Operating System | Overview | Multiple-choice | Knowledge | English | After the computer distinguishes between kernel mode and user mode instructions, the transition from kernel mode to user mode is completed after the execution of the operating system program, while the transition from user mode to kernel mode is accomplished by (). | Hardware | Core state program | User program | Interrupt Handler | A | null |
1,715 | Test | Operating System | Overview | Multiple-choice | Knowledge | English | "Visit Control" command () usage. | Only in user mode | Only in kernel mode | within the specified time | During the scheduled time | A | null |
1,716 | Test | Operating System | Overview | Multiple-choice | Knowledge | English | The operating system structure designed with () is clear and easy to debug. | Hierarchical Architecture | Modular architecture | Microkernel architecture | Macrokernel architecture | A | null |
1,717 | Test | Operating System | Overview | Multiple-choice | Knowledge | English | Relative to microkernel systems, () is not a disadvantage of monolithic kernel operating systems. | Occupies a large memory space | Lacks scalability and is inconvenient to port. | Kernel switching is too slow. | Lower reliability | C | null |
1,718 | Test | Operating System | Overview | Multiple-choice | Knowledge | English | Among the following statements, () is not suitable for describing a microkernel operating system. | The kernel is sufficiently small. | Functional Hierarchical Design | Based on the C/S model | Separation of Strategy and Mechanism | B | null |
1,719 | Test | Operating System | Overview | Multiple-choice | Knowledge | English | The boot program of a computer operating system is located in (). | Motherboard BIOS | Off-chip Cache | Main Memory ROM Area | Hard Disk Drive (HDD) | D | null |
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