IP Routing problems
- 1. You type debug ip rip on your router console and see that 172.16.10.0 is being advertised to you with a metric of 16. What does this mean?
Options- 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. Discuss
Correct Answer: The route is inaccessible.
Explanation:
You cannot have 16 hops on a RIP network by default. If you receive a route advertised with a metric of 16, this means it is inaccessible.
- 2. What does RIPv2 use to prevent routing loops?
- CIDR
- Split horizon
- Authentication
- Classless masking
- Holddown timers
Options- A. 1 and 3
- B. 2, 3 and 5
- C. 2 and 5
- D. 3 and 4 Discuss
Correct Answer: 2 and 5
Explanation:
RIPv2 uses the same timers and loop-avoidance schemes as RIPv1. Split horizon is used to stop an update from being sent out the same interface it was received on. Holddown timers allow time for a network to become stable in the case of a flapping link.
- 3. IGRP uses which of the following as default parameters for finding the best path to a remote network?
- Hop count
- MTU
- Cumulative interface delay
- STP
- Path bandwidth value
Options- A. 1 and 3
- B. 3 and 5
- C. 2, 3 and 5
- D. All of the above Discuss
Correct Answer: 3 and 5
Explanation:
IGRP uses bandwidth and delay of the line, by default, to determine the best path to a remote network. Delay of the line can sometimes be called the cumulative interface delay.
- 4. Which command displays RIP routing updates?
Options- A. show ip route
- B. debug ip rip
- C. show protocols
- D. debug ip route Discuss
Correct Answer: debug ip rip
Explanation:
The
debug ip rip command is used to show the Internet Protocol (IP) Routing Information Protocol (RIP) updates being sent and received on the router.
- 5. Which statement is true regarding classless routing protocols?
- The use of discontiguous networks is not allowed.
- The use of variable length subnet masks is permitted.
- RIPv1 is a classless routing protocol.
- IGRP supports classless routing within the same autonomous system.
- RIPv2 supports classless routing.
Options- A. 1, 3 and 5
- B. 3 and 4
- C. 2 and 5
- D. None of the above Discuss
Correct Answer: 2 and 5
Explanation:
Classful routing means that all hosts in the internetwork use the same mask. Classless routing means that you can use Variable Length Subnet Masks (VLSMs) and can also support discontiguous networking.
- 6. The Corporate router receives an IP packet with a source IP address of 192.168.214.20 and a destination address of 192.168.22.3. Looking at the output from the Corporate router, what will the router do with this packet?
Corp#sh ip route [output cut] R 192.168.215.0 [120/2] via 192.168.20.2, 00:00:23, Serial0/0 R 192.168.115.0 [120/1] via 192.168.20.2, 00:00:23, Serial0/0 R 192.168.30.0 [120/1] via 192.168.20.2, 00:00:23, Serial0/0 C 192.168.20.0 is directly connected, Serial0/0 C 192.168.214.0 is directly connected, FastEthernet0/0
Options- A. The packet will be discarded.
- B. The packet will be routed out the S0/0 interface.
- C. The router will broadcast looking for the destination.
- D. The packet will be routed out the Fa0/0 interface. Discuss
Correct Answer: The packet will be discarded.
Explanation:
Since the routing table shows no route to the 192.168.22.0 network, the router will discard the packet and send an ICMP destination unreachable message out interface FastEthernet 0/0, which is the source LAN where the packet originated from.
- 7. Which of the following statements are true regarding the command ip route 172.16.4.0 255.255.255.0 192.168.4.2?
- The command is used to establish a static route.
- The default administrative distance is used.
- The command is used to configure the default route.
- The subnet mask for the source address is 255.255.255.0.
Options- A. 1 and 2
- B. 2 and 4
- C. 3 and 4
- D. All of the above Discuss
Correct Answer: 1 and 2
Explanation:
Although answer D almost seems right, it is not; the mask is the mask used on the remote network, not the source network. Since there is no number at the end of the static route, it is using the default administrative distance of 1.
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