Ip Routing(Networking ) Questions and Answers

Question 1. What is split horizon?
  1.    Information about a route should not be sent back in the direction from which the original update came.
  2.    It splits the traffic when you have a large bus (horizon) physical network.
  3.    It holds the regular updates from broadcasting to a downed link.
  4.    It prevents regular update messages from reinstating a route that has gone down.
Explanation:-
Answer: Option A. -> Information about a route should not be sent back in the direction from which the original update came.
A split horizon will not advertise a route back to the same router it learned the route from.
Question 2. Which of the following statements are true regarding the command ip route 172.16.4.0 255.255.255.0 192.168.4.2?
1. The command is used to establish a static route.
2. The default administrative distance is used.
3. The command is used to configure the default route.
4. The subnet mask for the source address is 255.255.255.0.
  1.    1 and 2
  2.    2 and 4
  3.    3 and 4
  4.    All of the above
Explanation:-
Answer: Option A. -> 1 and 2
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.
Question 3. Which command displays RIP routing updates?
  1.    show ip route
  2.    debug ip rip
  3.    show protocols
  4.    debug ip route
Explanation:-
Answer: Option B. -> debug ip rip
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.
Question 4. Which statement is true regarding classless routing protocols?
1. The use of discontiguous networks is not allowed.
2. The use of variable length subnet masks is permitted.
3. RIPv1 is a classless routing protocol.
4. IGRP supports classless routing within the same autonomous system.
5. RIPv2 supports classless routing.
  1.    1, 3 and 5
  2.    3 and 4
  3.    2 and 5
  4.    None of the above
Explanation:-
Answer: Option C. -> 2 and 5
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.
Question 5. 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
  1.    172.16.30.0
  2.    192.168.30.0
  3.    10.0.0.0
  4.    All of them will be placed in the neighbor routing table
Explanation:-
Answer: Option C. -> 10.0.0.0
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.
Question 6. IGRP uses which of the following as default parameters for finding the best path to a remote network?
1. Hop count
2. MTU
3. Cumulative interface delay
4. STP
5. Path bandwidth value
  1.    1 and 3
  2.    3 and 5
  3.    2, 3 and 5
  4.    All of the above
Explanation:-
Answer: Option B. -> 3 and 5
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.
Question 7. 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?
1. Gateway (config) # ip route 0.0.0.0 0.0.0.0 206.143.5.2
2. Gateway (config) # router rip
3. Gateway (config-router) # network 206.143.5.0
4. Gateway (config-router) # network 206.143.5.0 default
  1.    1 only
  2.    3 only
  3.    1, 2 and 4
  4.    1 and 4
Explanation:-
Answer: Option D. -> 1 and 4
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.
Question 8. 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?
  1.    Any available route
  2.    RIP route
  3.    Static route
  4.    IGRP route
  5.    They will all load-balance.
Explanation:-
Answer: Option C. -> Static route
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.
Question 9. 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?
  1.    The route is 16 hops away.
  2.    The route has a delay of 16 microseconds.
  3.    The route is inaccessible.
  4.    The route is queued at 16 messages a second.
  5.    They will all load-balance.
Explanation:-
Answer: Option C. -> The route is inaccessible.
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.
Question 10. Two connected routers are configured with RIP routing. What will be the result when a router receives a routing update that contains a higher-cost path to a network already in its routing table?
  1.    The updated information will be added to the existing routing table.
  2.    The update will be ignored and no further action will occur.
  3.    The updated information will replace the existing routing table entry.
  4.    The existing routing table entry will be deleted from the routing table and all routers will exchange routing updates to reach convergence.
  5.    They will all load-balance.
Explanation:-
Answer: Option B. -> The update will be ignored and no further action will occur.
When a routing update is received by a router, the router first checks the administrative distance (AD) and always chooses the route with the lowest AD. However, if two routes are received and they both have the same AD, then the router will choose the one route with the lowest metrics, or in RIP's case, hop count.
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