单项选择题

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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
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
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