There is no difference between a host and an end system.
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A host doesn't process network-layer in the Internet protocol stack.
A. 对
B. 错
The full text in English of RFC is request for comments.
A. 对
B. 错
All communication activity in Internet governed by protocols.
A. 对
B. 错
Packet switching is commonly used in traditional telephone networks
A. 对
B. 错
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