單項選擇題During startup, the router displays the following error message: boot: cannot open "flash:" What will the router do next?（）

A.Because of damaged flash memory， the router will fail the POST
B.It will attempt to locate the IOS from a TFTP server. If this fails， it will initiate the setup dialog.
C.It will attempt to locate the IOS from a TFTP server. If this fails， it will load a limited IOS from ROM
D.It will attempt to locate the configuration file from a TFTP server. If this fails， it will initiate the setup dialog.
E.It will attempt to locate the configuration file from a TFTP server. If this fails， it will load a limited configuration from ROM


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1.單項選擇題What does the "Inside Global" address represent in the configuration of NAT?（）

A.the summarized address for all of the internal subnetted addresses
B.the MAC address of the router used by inside hosts to connect to the Internet
C.a globally unique， private IP address assigned to a host on the inside network
D.a registered address that represents an inside host to an outside network

2.單項選擇題Which statement accurately describes a benefit provided by VTP?（）

A.VTP allows routing between VLANs.
B.VTP allows a single port to carry information to more than one VLAN
C.VTP allows physically redundant links while preventing switching loops.
D.VTP allows switches to share VLAN configuration information.

3.單項選擇題On which types of network will OSPF elect a backup designated router?（）

A.point-to-point and multiaccess
B.point-to-multipoint and multiaccess
C.point-to-point and point-to-multipoint
D.nonbroadcast and broadcast multipoint
E.nonbroadcast and broadcast multiaccess

4.單項選擇題Why would a network administrator configure port security on a switch?（）

A.to prevent unauthorized Telnet access to a switch port
B.to limit the number of Layer 2 broadcasts on a particular switch port
C.to prevent unauthorized hosts from accessing the LAN
D.to protect the IP and MAC address of the switch and associated ports
E.to block unauthorized access to the switch management interfaces over common TCP ports

5.單項選擇題What is the effect of the following access list condition?  access-list 101 permit ip 10.25.30.0 0.0.0.255 any（）。

A.permit all packets matching the first three octets of the source address to all destinations
B.permit all packets matching the last octet of the destination address and accept all source addresses
C.permit all packets from the third subnet of the network address to all destinations
D.permit all packets matching the host bits in the source address to all destinations
E.permit all packets to destinations matching the first three octets in the destination address