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计算机
At which layers of the OSI model do WANs operate?
At which layers of the OSI model do WANs operate?
admin
2019-04-08
24
问题
At which layers of the OSI model do WANs operate?
选项
A、application layer
B、session layer
C、transport layer
D、physical layer
E、datalink layer
答案
D,E
解析
WAN是工作在一层和二层的,比如现在常用的Frame-relay,ATM等这些都是工作在OSI的二层的。
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