题目详情

TCP三次握手协议用于(  )。

  • A.数据链路层流量控制
  • B.网络层路由选择
  • C.传输层连接建立
  • D.传输层流量控制

正确答案及解析

正确答案
C
解析

本题考查TCP三次握手。

TCP三次握手过程:

在TCP/IP协议中,TCP协议提供可靠的连接服务,采用三次握手建立一个连接。

第一次握手:建立连接时,客户端发送syn包(syn=j)到服务器,并进入SYN_SEND状态,等待服务器确认;

第二次握手:服务器收到syn包,必须确认客户的SYN(ack=j+1),同时自己也发送一个SYN包(syn=k),即SYN+ACK包,此时服务器进入SYN_RECV状态;

第三次握手:客户端收到服务器的SYN+ACK包,向服务器发送确认包ACK(ack=k+1),此包发送完毕,客户端和服务器进入ESTABLISHED状态,完成三次握手。

完成三次握手,客户端与服务器开始传送数据,传输层建立连接。

综合分析,本题选C。

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