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单选题

Together with the network layer,the transport layer is the heart of the protocol ( 请作答此空).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
transport
B
network
C
hierarchy
D
service
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答案:

C

解析:

根据题目描述,该空需要填入一个词来描述网络层与传输层之间的关系。从句子结构和语境来看,这里强调的是协议中的层次结构,即传输层与网络层作为协议的核心,共同构成了协议的“心脏”,而这个“心脏”就是协议的层次结构(hierarchy)。因此,正确答案是C,即“hierarchy”。

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