正确答案: C
物理层
题目:在OSI七层模型中,介质工作在哪一层()
解析:C
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学习资料的答案和解析:
[单选题]TCP23是()协议端口号;UDP69是()端口号;TCP80是()端口号。
TELNET TFTP HTTP
[单选题]交换机转发数据到目的地依靠()
MAC地址表
[单选题]路由器下,由一般用户模式进入特权用户模式的命令是:()
enable
[单选题]After working on a router, some problems arise and you wish to view the commands that you recently entered. Which IOS command opens the history buffer and displays the most recently entered commands?
Show history
解析:A 解析:Explanation: