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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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

单项选择题

There are many page replacement algorithms in the page management. Most frequently used algorithm is

A．FIFO
B．PPT
C．OPT
D．LRU

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