CCNA题库V总结

1、1. Refer to the exhibit. From RouterA, a network administrator is able to ping the serial interface of RouterB but unable to ping any of the subnets attached to RouterB. Based on the partial outputs in the exhibit, what could be the problem?A. EIGRP does not support VLSM.B. The EIGRP network stateme

2、nts are incorrectly configured.C. The IP addressing on the serial interface of RouterA is incorrect.D. The routing protocol has summarized on the classful boundary. E. EIGRP has been configured with an invalid autonomous system number.Answer: D2. Refer to the exhibit. A junior network engineer has p

3、repared the exhibited configuration file. What two statements are true of the planned configuration for interface fa0/1? (Choose two.)A. The two FastEthernet interfaces will require NAT configured on two outside serial interfaces.B. Address translation on fa0/1 is not required for DMZ Devices to acc

4、ess the Internet.C. The fa0/1 IP address overlaps with the space used by s0/0.D. The fa0/1 IP address is invalid for the IP subnet on which it resides.E. Internet hosts may not initiate connections to DMZ Devices through the configuration that is shown.Answer: BE3 Refer to the exhibit. The following

5、 commands are executed on interface fa0/1 of 2950Switch.2950Switch(config-if)# switchport port-security2950Switch(config-if)# switchport port-security mac-address sticky2950Switch(config-if)# switchport port-security maximum 1The Ethernet frame that is shown arrives on interface fa0/1. What two func

6、tions will occur when this frame is received by 2950Switch? (Choose two.)A. The MAC address table will now have an additional entry of fa0/1 FFFF.FFFF.FFFF. B. Only host A will be allowed to transmit frames on fa0/1.C. This frame will be discarded when it is received by 2950Switch.D. All frames arri

7、ving on 2950Switch with a destination of 0000.00aa.aaaa will be forwarded out fa0/1.E. Hosts B and C may forward frames out fa0/1 but frames arriving from other switches will not be forwarded out fa0/1.F. Only frames from source 0000.00bb.bbbb, the first learned MAC address of 2950Switch, will be fo

8、rwarded out fa0/1.Answer: BD 4. Refer to the exhibit. What will Router1 do when it receives the data frame shown? (Choose three.)A. Router1 will strip off the source MAC address and replace it with the MAC address 0000.0c36.6965.B. Router1 will strip off the source IP address and replace it with the

9、 IP address 192.168.40.1.C. Router1 will strip off the destination MAC address and replace it with the MAC address 0000.0c07.4320.D. Router1 will strip off the destination IP address and replace it with the IP address of 192.168.40.1. E. Router1 will forward the data packet out interface FastEtherne

10、t0/1.F. Router1 will forward the data packet out interface FastEthernet0/2.Answer: ACF5. A router has been configured to provide the nine users on the branch office LAN with Internet access,as shown in the diagram. It is found that some of the users on the LAN cannot reach the Internet. Based on the

11、 topology and router output shown, which command should be issued on the router to correct the problem?A: Branch(config-if)# no shutdownB: Branch(config-if)# duplex fullC: Branch(config-if)# no keepaliveD: Branch(config-if)# ip address 192.168.10.30 255.255.255.240E: Branch(config-if)# bandwidth 100

12、F: Branch(config-if)# encapsulation 802.3Answer: D6. Refer to the exhibit. When the hosts boot, hosts that are connected to the switches are having trouble getting a DHCP address from the DHCP server. Which STP feature could minimize the effects of STP convergence for the hosts?A: port priorityB: Po

13、rtFastC: BIDD: path costE: hold-down timerAnswer: B7. Refer to the exhibit. The partial frame in the graphic represents select header information within a frame arriving at a destination host. What can be determined from this information?A: The source host is a Telnet server.B: This frame contains t

14、he first segment in a Telnet session.C: The Layer 2 address of the source host is 192.168.14.2.D: The local host has received 42,335 bytes from the remote host as a part of this conversation.Answer: B8. A network administrator wants to control which user hosts can access the network based on their M

15、AC address.What will prevent workstations with unauthorized MAC addresses from connecting to the network through a switch?A: BPDUB: port securityC: RSTPD: STPE: VTPF: blocking modeAnswer: B9. Refer to the exhibit. Workstation A must be able to telnet to switch SW-A through router RTA for management

16、purposes. What must be configured for this connection to be successful?A: VLAN 1 on RTAB: default gateway on SW-AC: IP routing on SW-AD: cross-over cable connecting SW-A and RTAAnswer: B10. Which function does the Frame Relay DLCI provide with respect to RouterA?A: defines the signaling standard bet

17、ween RouterA and the frame switchB: identifies the circuit between RouterA and the frame switchC: identifies the circuit between RouterB and the frame switchD: identifies the encapsulation used between RouterA and RouterBE: defines the signaling standard between RouterB and the frame switchAnswer: B

18、11. Refer to the exhibit. Given the partial configuration shown in the exhibit, why do internal workstations on the 192.168.1.0 network fail to access the Internet?A: A NAT pool has not been defined.B: The wrong interface is overloaded.C: NAT has not been applied to the inside and outside interfaces

19、.D: The access list has not been applied to the proper interface to allow traffic out of the internal network.Answer: C12. In a Frame Relay environment, what is the function of the DE bit?A: the activation of the LMI protocolB: the identification of the virtual circuitC: the identification of what r

20、outing updates to blockD: the identification of frames that are transmitted above the CIRE: the notification to the destination switch of network congestionAnswer: D13. The access control list shown in the graphic has been applied to the Ethernet interface of router R1 using the ip access-group 101

21、in command. Which of the following Telnet sessions will be blocked by this ACL? (Choose two.)A: from host A to host 5.1.1.10B: from host A to host 5.1.3.10C: from host B to host 5.1.2.10D: from host B to host 5.1.3.8E: from host C to host 5.1.3.10F: from host F to host 5.1.1.10Answer: BD14. A networ

22、k administrator is designing a new corporate internetwork. The corporation is concerned aboutdowntime due to link failure and also about link costs. Which topology will provide some redundancy toincrease reliability for all sites but will cost less than a fully redundant topology?Answer: B15. You ha

23、ve finished physically installing an access point on the ceiling at your office. At a minimum, which parameter must be configured on the access point in order to allow a wireless client to operate on it?A: AESB: PSKC: SSIDD: TKIPE: WEPAnswer: C16. What does a Layer 2 switch use to decide where to fo

24、rward a received frame?A: source MAC addressB: source IP addressC: source switch portD: destination IP addressE: destination port addressF: destination MAC addressAnswer: F17. The exhibited network is stable and operating properly. Assuming that default STP configurations are running on both switche

25、s, which port will be in blocking mode?A: Port Fa0/1 on Switch1B: Port Fa0/2 on Switch1C: Port Fa0/1 on Switch2D: Port Fa0/2 on Switch2Answer: A18. What Frame Relay mechanism is used to build the map illustrated in the accompanying graphic?A: ARPB: Inverse ARPC: inverse multiplexingD: LMI mappingE:

26、proxy ARPAnswer: B19. The system LED is amber on a Cisco Catalyst 2950 series switch. What does this indicate?A: The system is malfunctioning.B: The system is not powered up.C: The system is powered up and operational.D: The system is forwarding traffic.E: The system is sensing excessive collisions.

27、Answer: A20. Refer to the exhibit. The network administrator is configuring RTA to connect to a non-Cisco network. Which two commands would be applied to the S0/0 WAN interface, but not to the Fa0/0 LAN interface?(Choose two.)A:speedB:no shutdownC:ip addressD:authentication papE:encapsulation pppAns

28、wer: DE21. Which two of these are characteristics of the 802.1Q protocol? (Choose two.)A:It is used exclusively for tagging VLAN frames and does not address network reconvergence followingswitched network topology changes.B:It modifies the 802.3 frame header, and thus requires that the FCS be recomp

29、uted.C:It is a Layer 2 messaging protocol which maintains VLAN configurations across networks.D:It includes an 8-bit field which specifies the priority of a frame.E:It is a trunking protocol capable of carrying untagged frames.Answer: BE22. The network administrator has configured NAT as shown in th

30、e graphic. Some clients can access the Internet while others cannot. What should the network administrator do to resolve this problem?A: Configure an IP NAT pool.B: Properly configure the ACL.C: Apply the ACL to the S0 interface.D: Configure another interface with the ip nat outside command.Answer: B23. Refer to the exhibit. When running OSPF, what would cause router A not to form an adjacency with router B?A: The loopback addresses are on different subnets.B: The values of the dead timers on the routers are different.C: Route su