单项选择题

Every host and router on the Internet has an IP address, which encodes its

A．host number
B．host number and socket
C．network number
D．host number and network number
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单项选择题
Transport gateways connect byte streams in the transport layer. Application gateways allow interworking above
A．network layer
B．data link layer
C．transport layer
D．application layer
单项选择题
Layer n on one machine carries on a conversation with layer n on another machine. The rules and conventions used in this conversation are collectively known as the layer n
A．topology
B．protocol
C．service
D．peer
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