Exercise: Ip Routing

Questions for: Ip Routing

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
A:
1 only
B:
3 only
C:
1, 2 and 4
D:
1 and 4
Answer: D
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.
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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
A:
1 and 3
B:
3 and 5
C:
2, 3 and 5
D:
All of the above
Answer: B
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.
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Which two of the following are true regarding the distance-vector and link-state routing protocols?
  1. Link state sends its complete routing table out all active interfaces on periodic time intervals.
  2. Distance vector sends its complete routing table out all active interfaces on periodic time intervals.
  3. Link state sends updates containing the state of its own links to all routers in the internetwork.
  4. Distance vector sends updates containing the state of its own links to all routers in the internetwork.
A:
1 only
B:
3 only
C:
2 and 3 only
D:
None of the above
Answer: C
The distance-vector routing protocol sends its complete routing table out all active interfaces at periodic time intervals. Link-state routing protocols send updates containing the state of its own links to all routers in the internetwork.
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What does RIPv2 use to prevent routing loops?
  1. CIDR
  2. Split horizon
  3. Authentication
  4. Classless masking
  5. Holddown timers
A:
1 and 3
B:
2, 3 and 5
C:
2 and 5
D:
3 and 4
Answer: C
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.
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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?
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.
Answer: B
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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