Which of the following describe router functions?（）

单项选择题A Class C network address has been subnetted with a 27 mask.Which of the following addresses is a broadcast address for one of the resulting subnets?（）

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? （）

A. frame-relay arp
B. frame-relay map
C. frame-relay interface-dlci
D. frame-relay lmi-type

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. （）

A.192.168.27.33
B.192.168.27.112
C.192.168.27.119
D.192.168.27.126
E.192.168.27.175
F.192.168.27.208

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? （）

A. There is insufficient room for more than one image.
B. The router has detected a copy of the current software image on the TFTP server.
C. The file can be relocated and not compressed.
D. The image to load is a binary executable file.

单项选择题At Layer 2 of the OSI model, which component connects a host to the network media?（）

A. Hub
B. Switch
C. Bridge
D. NIC
E. Transceiver