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- Question
What is route poisoning?
Options- 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.
- Correct Answer
- It describes when a router sets the metric for a downed link to infinity.
ExplanationAnother way to avoid problems caused by inconsistent updates and to stop network loops is route poisoning. When a network goes down, the distance-vector routing protocol initiates route poisoning by advertising the network with a metric of 16, or unreachable (sometimes referred to as infinite). - 1. What command is used to stop RIP routing updates from exiting out an interface but still allow the interface to receive RIP route updates?
Options- 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 Discuss
- 2. 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?
Options- A. Any available route
- B. RIP route
- C. Static route
- D. IGRP route
- E. They will all load-balance. Discuss
- 3. You need to find the broadcast address used on a LAN on your router. What command will you type into the router from user mode to find the broadcast address?
Options- A. show running-config
- B. show startup-config
- C. show interfaces
- D. show protocols Discuss
- 4. You type Router#sh ru and receive an % ambiguous command error. Why did you receive this message?
Options- A. The command requires additional options or parameters.
- B. There is more than one show command that starts with the letters ru.
- C. There is no show command that starts with ru.
- D. The command is being executed from the wrong router mode. Discuss
- 5. What command do you type to save the configuration stored in RAM to NVRAM?
Options- A. Router(config)#copy current to starting
- B. Router#copy starting to running
- C. Router(config)#copy running-config startup-config
- D. Router#copy run startup Discuss
- 6. Network 206.143.5.0 was assigned to the Acme Company to connect to its ISP. The administrator of Acme would like to configure one router with the commands to access the Internet. Which commands could be configured on the Gateway router to allow Internet access to the entire network?
- Gateway(config)# ip route 0.0.0.0 0.0.0.0 206.143.5.2
- Gateway(config)# router rip
- Gateway(config-router)# network 206.143.5.0
- Gateway(config-router)# network 206.143.5.0 default
Options- A. 1 only
- B. 3 only
- C. 1, 2 and 4
- D. 1 and 4 Discuss
- 7. Which of the following is true regarding RIPv2?
Options- A. It has a lower administrative distance than RIPv1.
- B. It converges faster than RIPv1.
- C. It has the same timers as RIPv1.
- D. It is harder to configure than RIPv1. Discuss
- 8. What is split horizon?
Options- 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. Discuss
- 9. 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
Options- A. 172.16.30.0
- B. 192.168.30.0
- C. 10.0.0.0
- D. All of them will be placed in the neighbor routing table. Discuss
- 10. A network administrator views the output from the show ip route command. A network that is advertised by both RIP and IGRP appears in the routing table flagged as an IGRP route. Why is the RIP route to this network not used in the routing table?
Options- A. IGRP has a faster update timer.
- B. IGRP has a lower administrative distance.
- C. RIP has a higher metric value for that route.
- D. The IGRP route has fewer hops. Discuss
IP Routing problems
Search Results
Correct Answer: Router(config-router)# passive-interface s0
Explanation:
The
(config-router)#passive-interface command stops updates from being sent out an interface, but route updates are still received.
Correct Answer: Static route
Explanation:
Static routes have an administrative distance of 1 by default. Unless you change this, a static route will always be used over any other found route. IGRP has an administrative distance of 100, and RIP has an administrative distance of 120, by default.
Correct Answer: show interfaces
Explanation:
The command
show ip protocols will actually show you the broadcast address for each interface - too bad it isn't a possible answer. Your best answer is
show interfaces, which will provide the IP address and mask for each interface.
Correct Answer: There is more than one show command that starts with the letters ru.
Explanation:
The
% ambiguous command error means that there is more then one possible command that starts with
ru. Use a question mark to find the correct command.
Correct Answer: Router#copy run startup
Explanation:
To copy the running-config to NVRAM so that it will be used if the router is restarted, use the
copy running-config startup-config command (
copy run start for short).
Correct Answer: 1 and 4
Explanation:
There are actually three different ways to configure the same default route, but only two are shown in the answer. First, you can set a default route with the
0.0.0.0 0.0.0.0 mask and then specify the next hop, as in option A. Or you can use
0.0.0.0 0.0.0.0 and use the exit interface instead of the next hop. Finally, you can use option D with the
ip default-network command.
Correct Answer: It has the same timers as RIPv1.
Explanation:
RIPv2 is pretty much just like RIPv1. It has the same administrative distance and timers and is configured just like RIPv1.
Correct Answer: Information about a route should not be sent back in the direction from which the original update came.
Explanation:
A split horizon will not advertise a route back to the same router it learned the route from.
Correct Answer: 10.0.0.0
Explanation:
The network 10.0.0.0 cannot be placed in the next router's routing table because it already is at 15 hops. One more hop would make the route 16 hops, and that is not valid in RIP networking.
Correct Answer: IGRP has a lower administrative distance.
Explanation:
RIP has an administrative distance (AD) of 120, while IGRP has an administrative distance of 100, so the router will discard any route with a higher AD than 100.
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