题目内容

In network architecture, a protocol is a set of rules or conventions that allow peer layers to communicate()

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Internet originated from()

A. China
B. America
C. France
D. England

In network architecture, service is a “vertical” concept()

In network architecture, the place where adjacent layers interact is called service access point(SAP)()

In TCP/IP architecture, the PDU in network layer is()

A. bit
B. frame
C. packet
D. character

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