CISCO 真习题

1、CCNA、CCNP、CCIE模拟试题CCNA 1.Which of the following types of packets will be allowed entry when a serial interface's inbound access list has been configured to prohibit entry for TCP and UDP ports 21, 23 and 25 (Select three options.)A. SMTPB. STPC. FTPD. TelnetE. HTTPF. POP32.One of the trainees as

2、signed to you want to know which services use TCP. What can you tell him (Select three options.)A. DHCPB. SMTPC. SNMPD. FTPE. HTTPF. TFTP3.Which of the following network masks would you use to reduce any wastage of IP addresses in point-to- point WAN links on a network that supports VLSM?A. /38B. /3

3、0C. /27D. /23E. /18    4.How would you configure a router to avoid situations such as split horizon issues hampering routing updates on a Frame Relay network?A. Configure a separate sub-interface for each PVC with a unique DLCI and subnet assigned to the subinterface.B. Configure each

4、 Frame Relay circuit as a point-to-point line to support multicast and broadcast traffic.C. Configure one sub-interface to disperse into multiple PVC connections to multiple remote router interfaces.D. Configure as many as possible sub-interfaces on the same subnet.    5.With regard t

5、o ISDN, which of the following are true (Choose all that apply.)A. Legacy DDR can use port information to define interesting traffic.B. Legacy DDR can configure multiple dialer configurations on the same interface.C. Legacy DDR can use ACLs to define interesting traffic.D. HDLC or PPP can be used to

6、 encapsulate ISDN D channel information.E. The BRI interfaces on ISDN routers with dialer profiles configured cannot belong to multiple dialer pools.F. Dialer profiles cannot use ACLs to define interesting traffic.    CCNP    - BSCI    6.Which of the foll

7、owing is a characteristic of link-state protocols?A. A network topology change generates an update that is broadcast to every router onthe network.B. The periodic routing update interval is slightly different in each router on a subnet.C. Each router creates a routing table that only includes its di

8、rectly connected neighbors.D. Link-state protocols send routing updates only when there is a change in the networktopology.    7.What is the term associated with synchronizing the routing tables after a topology change occurs?A. floodingB. broadcastingC. convergenceD. summarization

9、60;   8.Which of the following must be determined first by the router in order to route the data?A. the distance metric of the dataB. the source address of the dataC. which routing protocol is used by the dataD. whether the protocol suite of the data is active    9.You are a

10、 technician at ABC. ABC has the subnet/mask of /26 set aside for small remote locations. Each location will have 5 IP devices connected to the network. Which VLSM mask will provide the minimum number of hosts you require?A. /27B. /28C. /29D. /30E. /31    10.You are a trainee tech

11、nician at ABC. Your instructor shows you the following route summarization entry:/22 Your instructor wants to know how many class C addresses are contained in this summarization. What would your reply be?A. 1B. 2C. 4D. 8E. 16    - BCMSN    11.Which command enables an Et

12、herChannel bundle on a Catalyst 2900XL switch?A. Port groupB. Set port channel onC. Port etherchannel enableD. Set etherchannel port enable    12.Which two statements about dynamic VLANs are true (Choose two)A. Each switch port is assigned to a specific VLAN.B. Dynamic VLANs require a

13、 VLAN Membership Policy Server.C. Devices are in the same VLAN regardless of which port they attach to.D. Dynamic VLAN assignment are made through the command interface.    13.Which statement is correct about 802.1Q trunking (Select all that apply)A. Both switches must be in the same

14、VTP domain.B. The encapsulation type of both ends of the trunk does not have to match.C. The native VLAN on both ends of the trunk must be VLAN 1.D. 802.1Q trunking can only be configured on a Layer 2 port.E. In 802.1Q trunking, all VLAN packets are tagged on the trunk link, except the native VLAN.&

15、#160;   14.You need to take advantage of FastEthernet ports. Which two actions avoid configuration problems that cause the port to be automatically disabled (Choose two)A. Allow some ports in a channel to be disabled.B. Configure the ports in a channel as dynamic VLAN ports.C. Configure al

16、l ports in a channel to operate at the same speed and duplex mode.D. Assign all ports in a channel to the same VLAN or configure them as trunk ports.15.What is the cause of jitter?A. Variable queue delaysB. Packet dropsC. Transmitting too many small packetsD. Compression    - BCRAN

17、60;   16.Regarding DHCP, DHCP relay and DHCP server are mutually exclusive.A. None of the choices.B. TrueC. False only for certain IOS versionD. FalseE. False only for IOS version below V10    17.A LAPD Address field can be 1 or 2 bytes long.A. TrueB. FalseC. True only in th

18、e USD. True only in AsiaE. True only in Europe    18.Which of the following are valid functions of the lock DTE modem attribute (Choose all that apply)A. Disable UART.B. Enable UART.C. Locks the data speed between the computer motherboard and the RS232 port.D. Locks the data speed bet

19、ween the modem and the DTE device.    19.Which of the following are not the valid types of ATM addresses (Choose all that apply)A. DCCB. GCTC. BSPD. ICDE. NSAPF. AED    20.Which of the following are NOT the valid types of X.25 PLP packet fields (Choose all that apply)A.

20、 User DataB. LCIC. GFID. PTIE. None of the choices.    - CIT    21.You are a technician at ABC.com. Your newly appointed ABC trainee wants to know what the similarities between Topology Diagrams and Network Configuration Tables are.What would your reply be (Choose all t

21、hat apply.)A. Both share few components.B. Both share many of the same components.C. Both define physical memory components.D. Both are used for troubleshooting.E. Both use lines and symbols to represent network components.    22.You are a technician at ABC.com. Your newly appointed A

22、BC trainee wants to know what the default action for the output of debug and system error messages is. What would your reply be?A. Output goes to the remote console if logging is off.B. Output is sent to the console terminal.C. Error logging automatically invokes debug output to the designated TFTP

23、server.D. Output configuration requires a TFTP server to write filesE. Output is written to a Syslog server.    23.You are the network administrator at ABC.com. ABC has a switched network. You want to control the designation of the spanning-tree root bridge in the ABC network. What sh

24、ould you do?A. By enabling uplink-fast on the ports of the desired switch.B. By lowering the bridge priority on the desired switch.C. By setting a lower MAC address on the designated switch.D. By raising the bridge ID on one switch.   24.You are a technician at ABC. You receive a report fr

25、om several ABC users who complain that they get slow responses when sending and receiving email, especially when browsing the Internet. You investigate the complaint by checking the output of a ping command issued from her computer and find that it indicates intermitted success and failures messages

26、, when attempting to contact the email server. A tracert to the corporate Internet gateway router shows high latency and occasional time out messages.What would be the most effective troubleshooting approach if you are to determine the cause of the slow response time?A. Bottom-up approachB. Random a

27、ccess approachC. Divide and conquer approachD. Top-down approachE. Top-down rule-out approach    25.You are a technician at ABC.com. Your newly appointed ABC trainee wants to know what features make OSPF more suitable than RP in large network installations. What would your reply be (C

28、hoose all that apply.)A. Diffusing Update AlgorithmB. No hop count limitationC. Higher routing update overheadD. Faster convergenceE. Lower routing update overhead    CCIE    26.You are the network administrator at ABC. You are troubleshooting a network problem. You wan

29、t to trace the route to a Unix workstation that you want to reach through the Internet. However, Traceroute does not work.Currently, there is an inbound access-list applied to the serial interface on Router 1. An entry in the access-list states "access-list 101 permit tcp any any". What ac

30、cess-list entry may you need to be added to the access-list in order to get traceroute to work?A. access-list 101 permit udp any anyB. access-list 101 permit icmp any any time-exceeded access-list 101 permit icmp any any port-unreachableC. access-list 101 permit icmp any any time-exceeded access-lis

31、t 101 permit icmp any any net-unreachableD. access-list 101 permit icmp any any echo access-list 101 permit icmp any any net-unreachableE. access-list 101 permit udp any any access-list 101 permit icmp any any protocol-unreachable    27.What does the BGP backdoor command do?A. It changes the distance of an iBGP route to 20.B. It changes the distance of an eBGP route to 200.C. It changes the distance of an IGP route to 20.D. It does not effect any changes