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? （）

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

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

单项选择题What will a router do during startup if a configuration file is not located in NVRAM?（）

A. it will search for the configuration file in the locations specified by boot system commands.
B. it will search for the configuration file in flash and if no configuration file is found there, it will enter the setup dialog.
C. it will search for the configuration file on a TFTP server and if no configuration file is found there, it will enter the setup dialog.
D. it will search for the configuration file in flash and if no configuration file is found there, it will load a limited configuration file from ROM.
E. it will search for the configuration file on a TFTP server and if no configuration file is found there, it will load a limited configuration file from ROM.

单项选择题A router leams about a remote network from EIGRP.OSPF. and a static route. Assuming all routing protocols are using their default administrative distance, which route will the router use to forward data to the remote network?（）

A. The router will use the static route.
B. The router will use the OSPF route.
C. The route will use the EIGRP route.
D. The router will load balance and use all three routes.