多項選擇題Which of the following describe router functions?（）

A. Packet switching
B. Collision prevention on a LAN segment
C. Packet filtering
D. Broadcast domain enlargement
E. Broadcast forwarding
F. Internetwork communication


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1.單項選擇題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

2.單項選擇題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

3.多項選擇題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

4.單項選擇題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.

5.單項選擇題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