单项选择题

TCP service is obtained by having both the sender and the receiver create end points,which are called（）

A.network address
B.supernet address
C.socket
D.IP address

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单项选择题
LANs can be connected by using bridges,which operate in the
A．physical layer
B．data link layer
C．network layer
D．transport layer
单项选择题
The following three concepts are essential to the OSI model:service,interface and
A．networks
B．applications
C．protocols
D．layers
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