TCP/IP协议分为四层,分别为应用层、传输层、网络层和网络接口层。不属于应用层协议的是( )。
- A.SNMP
- B.UDP
- C.TELNET
- D.FTP
正确答案及解析
正确答案
解析
根据OSI模型,把网络通信的工作分为七层。一至四层被认为是低层,这些层与数据移动密切相关;五至七层是高层,包含应用程序级的数据,每一层负责一项具体的工作,然后把数据传送到下一层。由低到高具体分为:物理层,数据链路层,网络层,传输层,会话层,表示层和应用层。
7应用层(Application Layer)向应用程序提供服务,如电子邮件、文件传输等。
6表示层(Presentqtion Layer)进行数据加密、压缩和翻译等。
5会话层(Session Layer)负责建立、管理、终止服务间的会话。
4传输层(Transport Layer)将数据进行分组和把分组重新组合成数据流。
3网络层(Network Layer)提供不同网段之间的路径选择和连接。
2数据链路层(Datalink Layer)进行差错控制和流量控制。
1物理层(Physical Layer)发送和接收原始的数据比特流。
UDP协议位于传输层,IP协议位于网络层。
参考答案:B
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