Together with the network layer,the transport layer is the heart of the protocol ( ).The network layer provides end-to-end (请作答此空) 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.

packet

data

command

record

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解析：

根据题目描述，该空需要填写的是与网络层一起构成协议核心的传输层所提供的传输类型。选项A中的packet（数据包）是网络层和传输层中常见的传输单位，因此是正确答案。其他选项如data（数据）、command（命令）和record（记录）虽然也可能在网络传输中出现，但在此处不如packet直接与问题相关。

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