单项选择题
A.201.57.78.33
B.201.57.78.64
C.201.57.78.97
D.201.56.78.97
E.201.57.78.159
F.201.57.78.254
单项选择题 Which command is required for connectivity in a Frame Relay network if Inverse ARP is not operational? （）
多项选择题 Identify three valid host addresses in the 192.168.27.0 network with a subnet mask of 255.255.255.240. （）
单项选择题 You are upgrading your Cisco router IOS from a TFTP server over the network. The upgrade procedure is stopped and you are prompted to erase the current flash contents before continuing. What is most plausible reason for this? （）