【测试】ccna题库
1. The accompanying graphic shows an extended IP access-list configuration.Router#show access-list
Extended IP access list 105
deny tcp any 172.30.24.64 0. 0. 0.63 eq smtp
deny tcp any any eq telnet
Router#show ip interface eo
Etherneto is up, line protoco1 is up
Internet address is 172.18.9.60/24
Broadcast address is 255.255.255.255
Address determined by setup command
Mtu is 1500 bytes
Helper address is not set
Directed broadcast forwarding is enabled
Outgoing access list is 105
Inbound access list is not set
Proxy arp is enabled
Security level is default
Split horizon is enabled
_________________________________________
Rest of configuration omitted
_________________________________________
What is the result of applying the access-list to Ethernet 0?
A. Only e-mail and telnet access will be permitted out of Ethernet 0.
B. All hosts on the 172.30.24.64 network will be permitted e-mail and telnet access.
C. All TCP protocols will be permitted out of Ethernet 0 except e-mail and telnet.
D. All IP traffic out of Ethernet 0 will be denied.
E. The access-list is numbered incorrectly and will fail.
Answer: D
2. Which of the following commands applies an access control list to a router interface?
A. permit access-list 101 out
B. ip access-group 101 out
C. apply access-list 101 out
D. access-class 101 out
E. ip access-list e0 out
Answer: B
3. Which command is used to display the placement and direction of an IP access control list on a
router?
A. show access-list
B. show ip route 1
C. show ip interface
D. show interface
E. show interface list
F. show ip interface brief
Answer: C
4. Which command displays the configuration register setting?
A. show register
B. show flash
C. show boot
D. show version
Answer: D
5. Which command successfully pings an individual IP address?
A. Router> ping 192.5.5.0
B. Router# ping 192.5.5.30
C. Router> ping 192.5.5.256
D. Router# ping 192.5.5.255
Answer: B
6. Which command will provide you with information regarding the Layer 3 configuration of directly
connected router interfaces?
A. show ip interface
B. show cdp neighbors
C. show cdp neighbors detail
D. show ip route
E. show ip link status
F. telnet
Answer: C
7. Which command loads a new version of the Cisco IOS into a router?
A. copy flash ftp
B. copy ftp flash
C. copy flash tftp
D. copy tftp flash
Answer: D
8. You are the network administrator of the Tasti-Treats Cereal Company. You receive a call from a user
who is unable to reach a server at a remote site. After further review, you discover the following
information:
local PC C 10.0.3.35/24
default gateway C 10.0.3.1
remote server C 10.0.5.250/24
You then conduct the following tests from the offending local PC:
ping 127.0.0.1 C successful
ping 10.0.3.35 C successful
ping 10.0.3.1 C successful
ping 10.0.5.250 C unsuccessful
Which of the following problems would create the test results listed above?
A. TCP/IP not correctly installed
B. local physical layer problem
C. local NIC not functioning.
D. Remote physical layer problem
Answer: D
9. RouterA(config)#router igrp 100
RouterA(config-router)#network 192.168.3.0
RouterA(config-router)#network 192.168.4.0
RouterA(config-router)#network 192.168.5.0
RouterA(config-router)#network 172.16.0.0
RouterB(config)#router igrp 101
RouterB(config-router)#network 192.168.3.0
RouterB(config-router)#network 192.168.6.0
RouterB(config-router)#network 192.168.7.0
Given the router configurations shown, which networks will be found in RouterB’s routing table,
assuming a properly configured network?
A. 192.168.3.0
192.168.4.0
192.168.5.0
192.168.6.0
192.168.7.0
172.16.0.0
B. 192.168.3.0
192.168.6.0
192.168.7.0
C. 192.168.3.0
192.168.4.0
192.168.5.0
192.168.6.0
192.168.7.0
D. 172.16.0.0
E. 192.168.3.0
192.168.4.0
192.168.5.0
Answer: B
10. Your Ethernet network, 172.30.1.0, shuts down. Which update message is seen in your router’s
debug ip rip output regarding that network?
A. subnet 172.30.1.0, metric 0
B. subnet 172.30.1.0, metric 1
C. subnet 172.30.1.0, metric 15
D. subnet 172.30.1.0, metric 16
Answer: D
11. Which of the following protocols utilizes features of both distance-vector and link-state routing?
A. RIP
B. OSPF
C. EIGRP
D. IGRP
Answer: C
12. You telnet to a host on a remote network. Which MAC address will be present in the ARP table
when you issue the show arp command?
A. MAC address of the destination host Ethernet port
B. MAC address of the local router Ethernet port
C. MAC address of the destination router Serial port
D. MAC address of the local router Serial port
Answer: B
13. Which parameter must be supplied when initializing the IGRP routing process?
A. connected network numbers
B. IP address mask
C. metric weights
D. autonomous system number
E. registered administrative id
Answer: D
14. A routing table contains static, RIP, and IGRP routes for the same destination network. Which
route would normally be used to forward data?
A. The IGRP route
B. The static route
C. The RIP route
D. All three will load balance
Answer: B
15. Which method does a Cisco Catalyst switch use to identify the VLAN membership of a frame over
trunked links?
A. Frame filtering with VLAN ID
B. Frame tagging with VLAN ID
C. Frame tagging with trunk ID
D. Frame filtering with trunk ID
E. Frame filtering with VTP port ID
Answer: B
16. Given the following routing table entry, which of the following are used by default in calculation of
the number 1200?(Choose 2)
172.16.0.0[100/1200]via 192.168.16.3, 00:00:55, Ethernet 1
A. MTU
B. Bandwidth
C. Administrative distance
D. Hop count
E. Metric
F. Delay
Answer: B F
17. Which route will not be entered into the routing table of the receiving router?
Router_B#show ip route
Codes:C-connected,s-static,I-IGRP,R-RIP,M-mobile,B-BGP,D-EIGRP,EX-EIGRP external,
O-OSPF,IA-OSPF inter area,EI-OSPF external type1,E2-OSPF external
type2,E-EGP,
I-IS_IS,L1-IS_IS LeveL-1,L2-IS_IS Level-2,*-candidate default,U-per-user static
route
Gateway of last resort is not set
R 192.168.8.0/24[120/1] via 192.168.2.2, 00:00:10, Serial 0
C 192.168.9.0/24 is directly connected,Serial 1
R 192.168.10.0/24[120/7] via 192.168.9.1, 00:00:02, Serial 1
R 192.168.11.0/24[120/7] via 192.168.9.1, 00:00:03, Serial 1
C 192.168.1.0/24 is directly connected,Ethernet 0
C 192.168.2.0/24 is directly connected,Serial 0
R 192.168.3.0/24[120/1] via 192.168.2.2, 00:00:10, Serial 0
R 192.168.4.0/24[120/15] via 192.168.2.2, 00:00:10, Serial 0
R 192.168.5.0/24[120/15] via 192.168.2.2, 00:00:10, Serial 0
R 192.168.6.0/24[120/15] via 192.168.2.2, 00:00:10, Serial 0
R 192.168.7.0/24[120/1] via 192.168.2.2, 00:00:10, Serial 0
A. R 192.168.8.0/24[120/1]via 192.168.2.2,00:00:10,Serial 0
B. R 192.168.11.0/24[120/7]via 192.168.9.1,00:00:03,Serial 1
C. C 192.168.1.0/24[120/7] is directly connected, Ethernet0
D. R 192.168.5.0/24[120/15]via 192.168.2.2,00:00:10,Serial 0
Answer : D
18. Given the network 199.141.27.0 with a subnet mask of 255.255.255.240, identify the valid host
addresses.( Choose three.)
A. 199.141.27.33
B. 199.141.27.112
C. 199.141.27.119
D. 199.141.27.126
E. 199.141.27.175
F. 199.141.27.208
Answer: A C D
19. Users on network 192.168.69.0/28 are complaining that they can not access the corporate intranet
server at [url]www.inhouse.com[/url]. In troubleshooting this problem, you find that you are able to telnet from a
workstation on this network to the internal webserver via its IP address. What is the most likely cause of
this problem?
A. TCP/IP failure
B. DNS failure
C. FTP failure
D. SNMP failure
Answer: B
20. IPX traffic using different encapsulation type can go over the same data link
A. true
B. false
Answer: A
21. ICMP(reffered to in RFC 1700) is implemented by all TCP/IP hosts
A. true
B. false
Answer: A
22. Calculate the number of usable networks and usable hosts for the network 210.106.14.0/24.
A. 1 network with 254 hosts
B. 2 networks with 128 hosts
C. 4 networks with 64 hosts
D. 6 networks with 30 hosts
Answer: A
23. If window size is changed from 3000 to 4000 during the data transfer stage of a TCP session, what
can a sending host do?
A. Transmit 3000 bytes before waiting for an acknowledgement.
B. Transmit 4000 packets before waiting for an acknowledgement.
C. Transmit 4000 bytes before waiting for an acknowledgement
D. Transmit 4000 segments before waiting for an acknowledgement.
E. Transmit 3000 frames before waiting for an acknowledgement
F. Transmit 3000 packets before waiting for an acknowledgement
Answer: C
24. Which command displays all routed protocols and the interfaces on which the protocol is enabled?
A. show protocols
B. show protocol brief
C. show interfaces protocol
D. show interfaces
E. show routed
F. show routed interfaces
Answer: D
25. Which of the following are true concerning distance vector and link state routing protocols? (Choose
two.)
A. Distance vector protocols send the entire routing table to directly connected neighbors.
B. Link state protocols send the entire routing table to all routers in the network.
C. Distance vector protocols send updates about directly connected neighbors to all networks listed in
the routing table.
D. Link state protocols send updates containing the state of their own links to all other routers on the
network.
Answer: A D
26. Choose the correct cable to connect an Ethernet switch to another Ethernet switch.
A. Cable #1
B. Cable #2
C. Cable #3
D. Cable #4
Answer: B
27. Choose the correct cable to directly connect a router to another router over Ethernet.
A. Cable #1
B. Cable #2
C. Cable #3
D. Cable #4
Answer: B
28. From the DOS command prompt, you are able to ping a router but are unable to telnet to it. What is
the most likely cause of the problem?
A. The PC has a bad network interface card
B. The IP address of the router is on a different subnet
C. No password has been set on the router vty lines
D. The default gateway is not set on the PC
E. The IP address of the workstation is incorrect
Answer: C
29. Which Layer 2 component connects the network media to the host?
A. hub
B. switch
C. bridge
D. NIC
E. transceiver
Answer: D
30. Which of the following are unique characteristics of half-duplex Ethernet as compared to full duplex
Ethernet?(Choose two)
A. Shared collision domain
B. Private collision domain
C. Higher effective throughput
D. Lower effective throughput
E. Private broadcast domain
Answer: A D
31. Modern networks are often described as using 100Base-TX components. What is meant by the
term ‘Base’ in this definition?
A. It describes the signaling method for communication on the network.
B. It refers to the type of media used in the network.
C. It relates to the speed of transmission of the network signals.
D. It defines the allowable length of media that can be used.
E. It defines half-duplex or full-duplex operation.
Answer: A
32. What are the effects of sustained, heavy collisions in CSMA/CD LANs? ( Choose 3.)
A. increased broadcast traffic
B. delay
C. low throughput
D. high throughput
E. congestion
F. higher bandwidth
Answer: B C E
33. What is the result of segmenting a network with a router into segments 1 and 2?
A. It increases the number of collisions.
B. It decreases the number of broadcast domains.
C. It connects segment 1’s and broadcasts to segment 2.
D. It prevents segment 1’s broadcasts from getting to segment 2.
Answer: D
34. Which commands could be used at the command line interface to troubleshoot LAN connectivity
problems on a router?(Choose three)
A. ping
B. tracert
C. ipconfig
D. show ip route
E. winipcfp
F. show interfaces
Answer: A D F
35. At what point in the frame shown in the diagram is the store-and-forward switching decision made?
A. A
B. B
C. C
D. D
Answer: D
36. You need to add a new VLAN, named ACCOUNTS, to your switched network. Which of the
following are true regarding configuration of this VLAN?(Choose three)
A. The VLAN must be created.
B. The VLAN must be named.
C. An IP address must be configured for the ACCOUNTS VLAN.
D. The desired ports must be added to the new VLAN.
E. The VLAN must be added to the STP domain.
Answer: A B D
37. Which two statements about the store and forward switching method are true? (Choose two)
A. Latency remains constant regardless of frame size.
B. Latency through the switch varies with frame length.
C. The switch receives the complete frame before beginning to forward it.
D. The switch checks the destination address as soon as it receives the header and begins forwarding
the frame immediately.
Answer: B C
38. Which of the following statements are true regarding bridges and switches? (Choose 3)
A. Switches are primarily software based while bridges are hardware based.
B. Both bridges and switches forward Layer 2 broadcasts.
C. Bridges are frequently faster than switches.
D. Switches have a higher number of ports than most bridges.
E. Bridges define broadcast domains while switches define collision domains.
F. Both bridges and switches make forwarding decisions based on Layer 2 addresses.
Answer: B D F
39. Given the network diagram, assume that ports 1 through 3 are assigned to VLAN1 and ports 4 through
6 are assigned to VLAN2 on each switch. The switches are interconnected over a trunked link. Which of
the following conditions would verify proper VLAN and trunk operation? (Choose three.)
A. Host 1-1 can ping Host 1-2
B. Host 1-1 can ping Host 4-2
C. Host 1-1 can not ping Host 1-2
D. Host 4-1 can not ping Host 1-2
E. Host 4-1 can ping Host 4-2.
Answer: A D E
40. Router#show interface serial 0
Serial0 is down, line protocol is down
Hardware is HD64570
Internet address is 172.22.5.1/30
MTU 1500 bytes, BW 1544 Kbit, DLY 20000 usec, rely 255/255, load 1/255
Encapsulation HDLC, loopback not set, keepalive set (10 sec)
Last input never, output 00:03:11, output hang never
Last clearing of "show interface" counters never
Input queue: 0/75/0 (size/max(drops): Total output drops: 0
Queuing strategy: weighted fair
Output queue: 0/1000/64/0 (size/max active/threshold/drops)
Conversations 0/2/256 (active/max active/max total)
Reserved Conversations 0/0 (allocated/max allocated)
5 minute input rate 0 bits/sec, 0 packets/sec
5 minute output rate 0 bits/sec, 0 packets/sec
0 packets input, 0 bytes, 0 no buffer
Received 0 broadcasts, 0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
11 packets output, 476 bytes, 0 underruns
0 output errors, 0 collisions, 27 interface resets
0 output buffer failures, 0 output buffers swapped out
11 carrier transitions
DCD=down DSR=down DTR=down RTS=down CTS=down
Based on the output of the show interface serial 0 command issued on a DTE router, which OSI layer
is the most likely source of the problem?
A. physical layer
B. data link layer
C. network layer
D. transport layer
Answer: A
41. A packet is the protocol data unit for which layer of the OSI model?
A. data link
B. session
C. presentation
D. network
E. transport
F. application
Answer: D
42. At which OSI layer does data translation and code formatting occur?
A. Physical
B. Data link
C. Network
D. Transport
E. Session
F. Presentation
Answer: F
43. Which devices operate at all seven layers of the OSI model? (Choose 3)
A. network host
B. network management station
C. transceiver
D. bridge
E. web server
F. switch
Answer: A B E
44. Router# show ipx interface e0
Ethernet0 is up. line protocol1 is up
IPX address is 6F2C.0000.0C5d.b36e. Novell_ETHER [up] line-up. RIPPQ: 0. SAPPQ: 0
Delay of this IPX network, in ticks is 1 throughput 0 link delay 0
IPXWAN processing not enabled on this interface.
IPX SAP update interval is 1 minute(s)
IPX type 20 propagation packed forwarding is disabled
Incoming access list is not set
Outgoing access list is not set
IPX helper access list is not set
SAP GNS processing enabled, delay 0 ms, output filter list is not set
SAP Input filter list is not set
SAP Output filter list is not set
SAP Router filter list is not set
Input filter list is not set
Output filter list is not set
Router filter list is not set
Netbios Input host access list is not set
Netbios Input bytes access list is not set
Netbios Output host access list is not set
Netbios Output bytes access list is not set
Updates each 60 seconds, aging multiples RIP: 3 SAP:3
SAP interpacket delay is 55 ms, maximum size is 480 bytes
RIP interpacket delay is 55 ms, maximum size is 432 bytes
IPX accounting is disabled
IPX fast switching is configured (enabled)
RIP packets received 0, RIP packets sent 1
SAP packets received 0, SAP packets sent 1
What is the Layer 2 address as shown in the output of the show ipx interface e0 command?
A. 6F2C
B. 0000.0C
C. 5d.b36e
D. 0c5d.b36e
E. 0000.0c5d.b36e
F. 6F2C.0000.0c5d.b36e
Answer: E
45. Which Frame Relay feature allows the point-to-point Frame Relay PVC between Router A and Router B
to be identified at Router A as 100 and at Router B as 200?
A. locally significant DLCI
B. globally significant DLCI
C. locally significant LMI
D. globally significant LMI
Answer: A
46. Exhibit:
Router A is connected to Router B, a non-Cisco router, through the network cloud. Using the command
output shown what must be configured on Router A’s interface s0 change the line protocol from down to
up?
A. no shutdown
B. encapsulation ppp
C. interface serial point-to-point
D. clock rate 56000
Answer: B
47. Use the partial BRI configuration and graphic shown. Which additional command must be issued on the
Central router before interesting traffic will be sent to the Remote router?
A. (config-if)# dialer-group 1
B. (config-if)# dialer-list 1
C. (config-if)# dialer map 1
D. (config-if)# dialer-route 1
Answer: A
48. Which IOS command is used to associate an ISDN phone number with the next hop router
address?
A. isdn destination number
B. dialer map
C. isdn spid1
D. isdn line number
Answer: B
49. When setting up Frame Relay for point-to-point subinterfaces, which of the following must not be
configured?
A. the Frame Relay encapsulation on the physical interface
B. the local DLCI on each subinterface
C. an IP address on the physical interface
D. the subinterface type as point-to-point
Answer: C
50. What is the bandwidth of an ISDN BRI B channel?
A. 16Kbps
B. 64Kbps
C. 128Kbps
D. 144Kbps
E. 192Kbps
Answer: B
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