TCP/IP(71)layer protocols provide services to the application(72)running on a computer. The application layer does not define th

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问题 TCP/IP(71)layer protocols provide services to the application(72)running on a computer. The application layer does not define the application itself, but rather it defines(73)that applications need — like the ability to transfer a file in the case of HTTP. In short, the application layer provides an(74)between software running on a computer and the network itself. The TCP/IP application layer includes a relatively large number of protocols, with HTTP being only one of those. The TCP/IP(75)layer consists of two main protocol options — the Transmission Control Protocol(TCP)and the User Datagram Protocol(UDP).

选项 A、application
B、session
C、physical
D、transport

答案D

解析 TCP/IP传输层协议为运行在计算机上的应用软件提供服务。应用层没有定义应用本身,而是定义了应用需要的服务,例如采用HTTP可以传输文件。简而言之,应用层提供了运行在计算机上的软件与网络之间的接口。TCP/IP应用层包括了很多的协议,HTTP仅是其中之一。TCP/IP传输层主要由两个可选的协议组成——传输控制协议(TCP)和用户数据报协议(UDP)。
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