Together with the network layer,the tran

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问题 Together with the network layer,the transport layer is the heart of the protocol(  )The network layer provides end-to-end(  ) delivery using datagrams or virtual circuits.The transport layer builds on the network layer to provide data transport from a process on a(  )machine to a process on a destination machine with a desired level of reliability that is independent of the physical (  ) currently in use.It provides the abstractions that applications nedd to use the network..Without the(  ) layer,the whole concept of layered protocols would make little sense.A.connectionB.terminalC.sourceD.destination

选项 A.connection
B.terminal
C.source
D.destination

答案 C

解析 传输层与网络层都是协议层次的心脏。网络层通过数据报或虚电路提供了端到端的分组提交服务。传输层建立在网络层之上,提供从源主机进程到目标主机进程的数据传输,这种传输的可靠性级别与当前使用的物理网络无关。这对使用网络通信的应用是一种抽象。没有传输层,整个协议层次的概念就没有意义了。
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