51CTO下载-CCNA作业5

1. You are not able to ping a server on the 19

2.168.50.0 network as shown in the following graphic from the Lab_A router. However, from the console of the Lab_B router, you can ping the server on the 192.168.50.0 network. Looking at the following routing table, what could the problem be?

Lab_B>

Codes: C - connected, S - static, I - IGRP, R - RIP, M - mobile, B - BGP D - EIGRP, EX - EIGRP external, O - OSPF,

IA - OSPF inter area N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2 E1 - OSPF external type 1, E2 - OSPF external type 2, E - EGP i - ISIS,

L1 - IS-IS level-1, L2 - IS-IS level-2, ia - IS-IS inter area

* - candidate default, U - per-user static route, o - ODR

P - periodic downloaded static route

Gateway of last resort is 10.1.1.1 to network 0.0.0.0

C 192.168.30.0/24 is directly connected, Ethernet0

C 192.168.40.0/24 is directly connected, Serial0

172.16.0.0/24 is subnetted, 1 subnets

C 172.16.20.0 is directly connected, Loopback0

C 192.168.20.0/24 is directly connected, Serial0

R 10.0.0.0/8 [120/1] via 192.168.20.1, 00:00:16, Serial1

R 192.168.50.0/24 [120/1] via 192.168.40.2, 00:00:00, Serial0

R 192.168.3.0/24 [120/2] via 192.168.20.1, 00:00:16, Serial1

S* 0.0.0.0 [1/0] via 10.1.1.1

Lab_B>

A. The routing tables have not converged.

B. The RIP configuration is incorrect.

C. The static route is incorrect.

D. The LAN interface on Lab_C is shut down.

2. What command is used to stop RIP routing updates from exiting out an interface but still receive RIP route updates?

A. Router(config-if)#no routing

B. Router(config-if)#passive-interface

C. Router(config-router)#passive-interface s0

D. Router(config-router)#no routing updates

3. Which is true regarding how RIP routers share routing information? Please refer to the figure in

question 1. (Choose two.)

A. Lab_A exchanges routing tables with Lab_C.

B. Lab_A exchanges routing tables with Lab_B.

C. Lab_B exchanges only with Lab_A.

D. Lab_C exchanges with Lab_B.

E. Lab_C exchanges with Lab_A.

4. In the following routing table, what does the [120/3] mean?

R 192.168.30.0/24 [120/1] via 192.168.40.1, 00:00:23, Serial0/0

C 192.168.40.0/24 is directly connected, Serial0/0

R 192.168.20.0/24 [120/1] via 192.168.40.1, 00:00:23, Serial/0

R 10.0.0.0/8 [120/2] via 192.168.40.1, 00:00:23, Serial0/0

C 192.168.50.0/24 is directly connected, FastEthernet0

R 192.168.3.0/24 [120/3] via 192.168.40.1, 00:00:23, Serial0/0

A. The IP port number and packets sent

B. The administrative distance and metric

C. The metric and hop count

D. The bandwidth and update timer

5. Which of the following is true regarding the following output? (Choose two.)

04:06:16: RIP: received v1 update from 192.168.40.2 on Serial0/1

04:06:16: 192.168.50.0 in 16 hops (inaccessible)

04:06:40: RIP: sending v1 update to 255.255.255.255 via FastEthernet0/0

(192.168.30.1)

04:06:40: RIP: build update entries

04:06:40: network 192.168.20.0 metric 1

04:06:40: network 192.168.40.0 metric 1

04:06:40: network 192.168.50.0 metric 2

04:06:40: RIP: sending v1 update to 255.255.255.255 via Serial0/1

(192.168.40.1)

A. There are three interfaces on the router participating in this update.

B. A ping to 192.168.50.1 will be successful.

C. There are at least two routers exchanging information.

D. A ping to 192.168.40.2 will be successful.

6. What is split horizon?

A. Information about a route should not be sent back in the direction from which the original

update came.

B. It splits the traffic when you have a large bus (horizon) physical network.

C. It holds the regular updates from broadcasting to a downed link.

D. It prevents regular update messages from reinstating a route that has gone down.

7. What is poison reverse?

A. It sends back the protocol received from a router as a poison pill, which stops the regular

updates.

B. It is information received from a router that can’t be sent back to the originating router.

C. It prevents regular update messages from reinstating a route that has just come up.

D. It describes when a router sets the metric for a downed link to infinity.

8. Which Cisco IOS command can you use to see the IP routing table?

A. sh ip config

B. sh ip arp

C. sh ip route

D. sh ip table

9. Which two of the following are true regarding the distance-vector and link-state routing protocols?

(Choose two.)

A. Link state sends its complete routing table out all active interfaces on periodic time intervals.

B. Distance vector sends its complete routing table out all active interfaces on periodic time intervals.

C. Link state sends updates containing the state of their own links to all routers in the internetwork.

D. Distance vector sends updates containing the state of their own links to all routers in the

internetwork.

10. Which command displays RIP routing updates?

A. show ip route

B. debug ip rip

C. show protocols

D. debug ip route

11. Which of the following shows the correct parameters for configuring IGRP on the Lab_B router?

A. router igrp 10

network 10.3.1.0

network 192.168.0.0

B. router igrp

network 10.0.0.0

C. router igrp 100

network 10.0.0.0

network 192.168.30.0

network 172.16.0.0

D. router igrp 100

network 10.0.0.0

network 192.168.30.0

network 172.16.40.0

12. What is the difference between routed and routing protocols? (Choose two.)

A. Routed protocols update the routing tables of a router.

B. Routing protocols determine the path of a packet through a network.

C. Routed protocols are assigned to a router interface and determine the method of packet delivery.

D. Routing protocols are assigned to a router interface and determine the method of packet delivery.

13. How is the 16300 calculated in the following? (Choose two.)

I 192.168.10.0 [100/16300] via 192.168.20.1

A. Maximum transmission unit

B. Bandwidth

C. Hop count

D. Delay

E. Administrative distance

14. If an IGRP advertised route has been determined to be invalid, when will the entry be removed

from the routing table?

A. 30 seconds

B. 90 seconds

C. 180 seconds

D. 360 seconds

E. 630 seconds

15. You type debug ip rip on your router console and see that 172.16.10.0 is being advertised with

a metric of 16. What does this mean?

A. The route is 16 hops away.

B. The route has a delay of 16 microseconds.

C. The route is inaccessible.

D. The route is queued at 16 messages a second.

16. IGRP uses which of the following as default parameters for finding the best path to a remote network?

(Choose two.)

A. Hop count

B. MTU

C. Cumulative interface delay

D. STP

E. Path bandwidth value

17. An administrator is connected to the Lab_B router and can ping the s0/0 interface of Lab_C but not the f0/0 interface. Using the output below and the figure shown in question 1, which of the following could be the problem? (Choose two.)

Lab_C#sh ip protocols

Routing Protocol is "rip"

Sending updates every 30 seconds, next due in 10 seconds

Invalid after 180 seconds, hold down 180, flushed after 240

Outgoing update filter list for all interfaces is

Incoming update filter list for all interfaces is

Redistributing: rip

Default version control: send version 1, receive any version

Interface Send Recv Triggered RIP Key-chain

Ethernet0 1 1 2

Serial 0 1 1 2

Automatic network summarization is in effect

Routing for Networks:

192.168.40.0

Routing Information Sources:

Gateway Distance Last Update

192.168.40.1 120 00:00:26

Distance: (default is 120)

A. The FastEthernet interface on the Lab_C router is shut down.

B. The Lab_C router does not have the 192.168.50.0 network in the RIP configuration.

C. RIP routing on the Lab_C router is not forwarding updates.

D. The clock rate command was not entered on the Lab_B s0/1 interface.

18. If your routing table has a static, a RIP, and an IGRP route to the same network, which route

will be used to route packets by default?

A. Any available route

B. RIP route

C. Static route

D. IGRP route

E. They will all load-balance.

19. You have the following routing table. Which of the following networks will not be placed in the neighbor routing table?

R 192.168.30.0/24 [120/1] via 192.168.40.1, 00:00:12, Serial0

C 192.168.40.0/24 is directly connected, Serial0

172.16.0.0/24 is subnetted, 1 subnets

C 172.16.30.0 is directly connected, Loopback0

R 192.168.20.0/24 [120/1] via 192.168.40.1, 00:00:12, Serial0

R 10.0.0.0/8 [120/15] via 192.168.40.1, 00:00:07, Serial0

C 192.168.50.0/24 is directly connected, Ethernet0

A. 172.16.30.0

B. 192.168.30.0

C. 10.0.0.0

D. All of them will be placed in the neighbors routing table.

20. What is the default administrative distance for IGRP?

A. 90

B. 100

C. 120

D. 220