Telnet是TCP/IP协议层次中______提供服务。
- A.网络层
- B.应用层
- C.传输层
- D.网络接口层
正确答案及解析
正确答案
解析
本题考查TCP/IP协议基本知识。TCP/IP协议由四个层次组成：网络接口层、网络层、传输层、应用层。网络接口层(又称数据链路层)(Network Interface Layer)提供了TCP/IP与各种物理网络接口，把IP数据报封装成能在网络中传输数据帧，为数据报传送和校验提供了可能。数据链路层最终将数据报传递到目主机或其他网络。网络接口层常见协议包括：Ethernet 802.3、Token Ring 802.5、X.25、Frame relay、HDLC、PPPATM等。网络层(Network Layer。)负责网络之间数据传输。接收传输层发送数据分组，并将分组封装成IP数据报，然后将数据报发往适当网络接口；并处理路径、流控、拥塞等问题。网络层常见协议包括：IP协议、ICMP协议、ARP协议、RARP协议等。传输层(Transport Layer。)主要服务功能是建立、提供端到端通信连接，它可以同时从应用层几个应用程序接收数据并发送给下一层(IP)。传输层主要协议包括：TCP(传输控制协议)和UDP(用户报文协议)。应用层(Application Layer)应用层根据不同用户各种需求，向用户提供所需网络应用程序服务。应用层提供服务包括：FTP(文件传输协议)，Telnet(用户远程登录服务)，DNS(域名解析服务)，SMTP(简单邮件传输协议)，用来控制邮件发送、周转。POP3(接收邮件协议)。
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