合理规划网站,北太平庄做网站公司,如何查询网站的备案信息,在线视频网站建设单词 汉语意思 音标 acknowledge 承认#xff0c;确认 /əkˈnɒl.ɪdʒ/ acknowledgment 确认#xff0c;承认 /əkˈnɒl.ɪdʒ.mənt/ duplex 双向的 /ˈdjuː.pleks/ establish 建立 /ɪˈstb.lɪʃ/ handshake 握手#xff0c;握手协议 /ˈhnd.ʃeɪk… 单词 汉语意思 音标 acknowledge 承认确认 /əkˈnɒl.ɪdʒ/ acknowledgment 确认承认 /əkˈnɒl.ɪdʒ.mənt/ duplex 双向的 /ˈdjuː.pleks/ establish 建立 /ɪˈstæb.lɪʃ/ handshake 握手握手协议 /ˈhænd.ʃeɪk/ re-transmission 重传 /ˌriː.trænsˈmɪʃ.ən/ receiver 接收者 /rɪˈsiː.vər/ reliable 可靠的 /rɪˈlaɪ.ə.bəl/ sequence 序列顺序 /ˈsiː.kwəns/ segment 段片段 /ˈseg.mənt/ synchronize 同步 /ˈsɪŋ.krə.naɪz/ termination 终止结束 /ˌtɜː.mɪˈneɪ.ʃən/ transmit 传输 /trænzˈmɪt/ transmitter 发送者 /trænzˈmɪt.ər/ synchronize 同步 /ˈsɪŋ.krə.naɪz/ termination 终止结束 /ˌtɜː.mɪˈneɪ.ʃən/ handshake 握手握手协议 /ˈhænd.ʃeɪk/ duplex 双向的 /ˈdjuː.pleks/ acknowledgment 确认承认 /əkˈnɒl.ɪdʒ.mənt/ retransmission 重传 /ˌriː.trænsˈmɪʃ.ən/
TCP Connection (A 3-way handshake)
Handshake refers to the process to establish connection between the client and server. Handshake is simply defined as the process to establish a communication link. To transmit a packet, TCP needs a three way handshake before it starts sending data. The reliable communication in TCP is termed as PAR (Positive Acknowledgement Re-transmission). When a sender sends the data to the receiver, it requires a positive acknowledgement from the receiver confirming the arrival of data. If the acknowledgement has not reached the sender, it needs to resend that data. The positive acknowledgement from the receiver establishes a successful connection.
Here, the server is the server and client is the receiver. The above diagram shows 3 steps for successful connection. A 3-way handshake is commonly known as SYN-SYN-ACK and requires both the client and server response to exchange the data. SYN means synchronize Sequence Number and ACK means acknowledgment. Each step is a type of handshake between the sender and the receiver.
The diagram of a successful TCP connection showing the three handshakes is shown below: The three handshakes are discussed in the below steps:
Step 1: SYN
SYN is a segment sent by the client to the server. It acts as a connection request between the client and server. It informs the server that the client wants to establish a connection. Synchronizing sequence numbers also helps synchronize sequence numbers sent between any two devices, where the same SYN segment asks for the sequence number with the connection request.
Step 2: SYN-ACK
It is an SYN-ACK segment or an SYN ACK segment sent by the server. The ACK segment informs the client that the server has received the connection request and it is ready to build the connection. The SYN segment informs the sequence number with which the server is ready to start with the segments.
Step 3: ACK
ACK (Acknowledgment) is the last step before establishing a successful TCP connection between the client and server. The ACK segment is sent by the client as the response of the received ACK and SN from the server. It results in the establishment of a reliable data connection.
After these three steps, the client and server are ready for the data communication process. TCP connection and termination are full-duplex, which means that the data can travel in both the directions simultaneously.
TCP Termination (A 4-way handshake)
Any device establishes a connection before proceeding with the termination. TCP requires 3-way handshake to establish a connection between the client and server before sending the data. Similarly, to terminate or stop the data transmission, it requires a 4-way handshake. The segments required for TCP termination are similar to the segments to build a TCP connection (ACK and SYN) except the FIN segment. The FIN segment specifies a termination request sent by one device to the other. The client is the data transmitter and the server is a receiver in a data transmission process between the sender and receiver. Consider the below TCP termination diagram that shows the exchange of segments between the client and server.
The diagram of a successful TCP termination showing the four handshakes is shown below: Lets discuss the TCP termination process with the help of six steps that includes the sent requests and the waiting states. The steps are as follows:
Step 1: FIN
FIN refers to the termination request sent by the client to the server. The first FIN termination request is sent by the client to the server. It depicts the start of the termination process between the client and server.
Step 2: FIN_ACK_WAIT
The client waits for the ACK of the FIN termination request from the server. It is a waiting state for the client.
Step 3: ACK
The server sends the ACK (Acknowledgement) segment when it receives the FIN termination request. It depicts that the server is ready to close and terminate the connection.
Step 4: FIN _WAIT_2
The client waits for the FIN segment from the server. It is a type of approved signal sent by the server that shows that the server is ready to terminate the connection.
Step 5: FIN
The FIN segment is now sent by the server to the client. It is a confirmation signal that the server sends to the client. It depicts the successful approval for the termination.
Step 6: ACK
The client now sends the ACK (Acknowledgement) segment to the server that it has received the FIN signal, which is a signal from the server to terminate the connection. As soon as the server receives the ACK segment, it terminates the connection. 中文总结 TCP连接建立三次握手 SYN同步序列号客户端向服务器发送连接请求。 SYN-ACK服务器回应确认收到请求并准备连接。 ACK确认客户端确认服务器的响应连接建立。 TCP连接的特点 使用PARPositive Acknowledgement with Retransmission来确保可靠通信。 连接是双向的全双工数据可以同时双向传输。 TCP连接终止四次握手 FIN终止请求客户端发出终止连接的请求。 FIN_ACK_WAIT客户端等待服务器的ACK。 ACK服务器确认收到FIN请求。 FIN_WAIT_2客户端等待服务器的FIN信号。 FIN服务器发送FIN信号表示准备终止连接。 ACK客户端确认收到FIN连接终止。
