问题
单项选择题
TCP means it is on the (74) layer and IP means it is on the (75) layer.
A．network
B．transport
C．data link
D．application
答案
参考答案：A
解析： 略
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TCP means it is on the (74) layer and IP means it is on the (75) layer.
A．network
B．transport
C．data link
D．application
参考答案：A
解析： 略