單項選擇題

When upgrading the IOS image, the network administrator receives the exhibited error messagE.What could be the cause of this error?（）

A.The new IOS image is too large for the router flash memory.
B.The TFTP server is unreachable from the router.
C.The new IOS image is not correct for this router platform.
D.The IOS image on the TFTP server is corrupt.
E.There is not enough disk space on the TFTP server for the IOS image.


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1.單項選擇題Which statement is true， as relates to classful or classless routing？（）

A.Automatic summarization at classful boundries can cause problems on discontinuous subnets
B.EIGRP and OSPF are classful routing protocols and summarize routes by default
C.RIPv1 and OSPF are classless routing protocols
D.Classful routing protocols send the subnet mask in routing updates

2.多項選擇題For what two purposes does the Ethernet protocol use physical addresses？（）

A.to uniquely identify devices at Layer 2
B.to allow communication with devices on a different network
C.to differentiate a Layer 2 frame from a Layer 3 packet
D.to establish a priority system to determine which device gets to transmit first
E.to allow communication between different devices on the same network
F.to allow detection of a remote device when its physical address is unknown

3.多項選擇題What are three characteristics of the OSPF routing protocol？（）

A. It converges quickly.
B. OSPF is a classful routing protocol.
C. It uses cost to determine the best route.
D. It uses the DUAL algorithm to determine the best route.
E. OSPF routers send the complete routing table to all directly attached routers.
F. OSPF routers discover neighbors before exchanging routing information.

4.單項選擇題Which device might be installed at a branch office to enable and manage an IPsec site-to-site VPN？（）

A.Cisco IOS IPsec/SSL VPN client
B.Cisco VPN Clinet
C.ISDN terminal adapter
D.Cisco Adaptive Security Appliance

5.單項選擇題what is the cause of this problem?（）

A.The OSPF area is not configured properly.
B.The priority on R1 should be set higher.
C.The cost on R1 should be set higher.
D.The hello and dead timers are not configured properly.
E.A backup designated router needs to be added to the network.
F.The OSPF process ID numbers must match.

6.單項選擇題At which layer of the OSI model is RSTP used to prevent loops？（）

A.data link
B.network
C.physical
D.transport

8.多項選擇題Which three IP addresses can be assigned to hosts if the subnet mask is /27 and subnet zero is usable？（）

A. 10.15.32.17
B. 17.15.66.128
C. 66.55.128.1
D. 135.1.64.34
E. 129.33.192.192
F. 192.168.5.63

9.多項選擇題The network administrator has been asked to give reasons for moving from ipv4 to ipv6. what are two validreasons for adopting ipv6 over ipv4？（）

A.telnet access does not require a password
B.nat
C.no broadcast
D.chanage of destination address in the ipv6 header
E.chanage of source address in the ipv6 header
F.autoconfiguration

10.單項選擇題The network administrator has discovered that the power supply has failed on a switch in the company LAN and that the switch has stopped functioning. It has been replaced with a Cisco Catalyst 2950 series switch. What must be done to ensure that this new switch becomes the root bridge on the network？（）

A. Lower the bridge priority number.
B. Change the MAC address of the switch.
C. Increase the VTP revision number for the domain.
D. Lower the root path cost on the switch ports.
E. Assign the switch an IP address with the lowest value.