单项选择题
A. Executing password recovery is required.
B. The virtual terminal lines are misconfigured.
C. Use Telnet to connect to RouterA and then to NewSwitch to correct the error.
D. Power cycle of NewSwitch will return it to a default configuration.
单项选择题 A host is attempting to send data to another host on a different network. What is the first action that the sending host will take?（）
单项选择题 When two hosts are trying to communicate across a network, how does the host originating the communication determine the hardware address of the host that it wants to "talk" to?（）
单项选择题 Which network protocol does DNS use?（）