70TCP是互联网中的(请作答此空)协议,使用( )次握手协议建立连接。
- A.传输层
- B.网络层
- C.会话层
- D.应用层
正确答案及解析
正确答案
解析
TCP即传输控制协议,是整个TCP/IP协议族中最重要的协议之一,它在IP协议提供的不可靠数据服务的基础上,采用了重发技术,为应用程序提供了一个可靠的、面向连接的、全双工的数据传输服务。TCP协议传输层的协议,一般用于传输数据量比较少,且对可靠性要求高的应用。
TCP使用3次握手来建立连接,三次握手的过程如下:
首先,主机A发送特有SYN的连接建立请求,其中包含了顺序号x;
然后,当主机B接收到这个请求后,将回复连接请求,它将向主机A发送带有SYN确认TCP段,其中加入了主机B的顺序号y和确认后希望收到的顺序号为x+1的TCP段;
接着,当主机A收到该回复后将再次发送一个确认段,此时就已经没有SYN标志,而顺序号为x+1,确认码为y+1,表示期望接收到主机B发来的顺序号为y+1的数据。
至此,在主机A和主机B之间已经建立起一个TCP连接,双方可以开始进行通信了。
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