单项选择题
At which of the following layers does the ICMP protocol operate?()
A.Layer 1
B.Layer 3
C.Layer 4
D.Layer 5
点击查看答案&解析
相关考题

单项选择题
A.Layer 1
B.Layer 3
C.Layer 4
D.Layer 5
微信扫一扫,加关注免费搜题