Fill in the blanks, multiple choice questions
- There are two transmission protocols in the Internet network, namely TCP and UDP
- The transport layer port number is a 16-bit integer
- The transmission service provided by UDP protocol is connectionless and unreliable datagram
- UDP some correspond to the transport layer
- UDP sums all the content involved in the calculation according to 16 bits when the computer verifies the sum
- The transmission service provided by the TCP protocol is a connection-oriented reliable and ordered byte stream
- The communication service provided by TCP is a full-duplex communication service
- TCP connection is established through a three-way handshake process
- TCP's reliable data transmission is a sliding window protocol
- The core task of the transport layer is to provide end-to-end (logical communication) services between application processes
- The services provided by the transport layer can be divided into connection-oriented and connectionless services
- The most typical pipeline reliable transmission protocol is the sliding window protocol
- The two most representative sliding window protocols are the SR and GBN protocols
- UDP validation and error detection function is provided
- The sequence number field in the TCP segment occupies 32 bits
- TCP connection management includes connection establishment and disconnection
- Congestion control strategies can be divided into two categories: congestion prevention and congestion elimination
- Provide transport layer services are TCP and UDP
- Which of the following characteristics of the services provided by the Transmission Control Protocol TCP is correct is:
- Connection-oriented transmission
- Use byte stream transmission
- High reliability, no loss or disorder
- The transmission protocol that provides connectionless datagram services in the TCP/IP reference model is UDP (User Datagram Protocol)
- From the point of view of sliding window, GNB protocol, its window size is: sending window>=1, receiving window=1
- From the perspective of sliding window, in selecting retransmission protocol: send window>1, receive window>1
- Stop waiting scheme and sliding window mechanism for data link layer (flow control)
- Which of the following statements about the characteristics of the services provided by UDP is correct:
- Do not check and modify the datagram
- No need to establish a connection before transferring data
- Has good real-time performance and high efficiency
- The following network protocols belong to the transport layer of the TCP/IP architecture: UDP
- The following network protocol provides unreliable user data packet transmission service is UDP
- The address of the transport layer of the TCP/IP reference model is the port number of the process
- The service features provided by the TCP protocol include: connection-oriented transmission, full-duplex transmission, and byte flow transmission
- What realizes end-to-end traffic transmission control in the OSI reference model is (transport layer)
- The flow control protocol used by TCP is: variable size sliding window protocol
- The reliability of network data transmission is generally guaranteed through confirmation, retransmission, error detection, sequence number and timer mechanisms
- TCP connection establishment uses a three-way handshake protocol
- The main function of the transport layer is responsible for end-to-end communication between application processes
- The number of bits of the port address in the TCP segment structure is 16
Short answer
- Briefly describe the basic working process of the
stop-and- stop protocol. The basic working process of the stop-and-wait protocol is: the sender sends an error-coded and numbered message segment and waits for the receiver's confirmation;
if the receiver correctly accepts the message segment, it means an error If the detection is correct and the sequence number is correct, the message segment is received, and the send continues ACK
otherwise discards the message segment, and sends NAK
to the sender. If the ACK is received, the sender will continue to send subsequent messages, otherwise the just sent will be retransmitted Segment - Briefly describe the reasons why developers build applications on UDP
(1) The application process is easier to control what data to send and when to send
(2) No connection is required
(3) No connection state
(4) Small header overhead
Guarantee for the future of pigs!
The boyfriend can’t make the girlfriend angry. The girlfriend is angry because the boyfriend is wrong. In any case, the boyfriend is wrong. If the boyfriend is wrong, he must willingly accept any punishment from the girlfriend, otherwise he will be matched with the girlfriend boyfriend. Just spit on Han, the boyfriend should make his girlfriend more happy and think more about his girlfriend, know how to pity and cherish his girlfriend, and take care of his girlfriend. To be continued. . . .