Exercise: Eigrp And Ospf

Questions for: Eigrp And Ospf

Which is true regarding EIGRP successor routes?
  1. A successor route is used by EIGRP to forward traffic to a destination.
  2. Successor routes are saved in the topology table to be used if the primary route fails.
  3. Successor routes are flagged as "active" in the routing table.
  4. A successor route may be backed up by a feasible successor route.
  5. Successor routes are stored in the neighbor table following the discovery process.
A:
1 and 3
B:
2 and 3
C:
1 and 4
D:
3, 4 and 5
Answer: C
Successor routes are the routes picked from the topology table as the best route to a remote network, so these are the routes that IP uses in the routing table to forward traffic to a remote destination. The topology table contains any route that is not as good as the successor route and is considered a feasible successor, or backup route. Remember that all routes are in the topology table, even successor routes.
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Which command will display all the EIGRP feasible successor routes known to a router?
A:
show ip routes *
B:
show ip eigrp summary
C:
show ip eigrp topology
D:
show ip eigrp adjacencies
Answer: C
Any secondary route to a remote network is considered a feasible successor, and those routes are only found in the topology table and used as backup routes in case of primary route failure. You can see the topology table with the show ip eigrp topology command.
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Where are EIGRP successor routes stored?
A:
In the routing table only
B:
In the neighbor table only
C:
In the topology table only
D:
In the routing table and the topology table
Answer: D
Successor routes are going to be in the routing table since they are the best path to a remote network. However, the topology table has a link to each and every network, so the best answer is topology table and routing table. Any secondary route to a remote network is considered a feasible successor, and those routes are only found in the topology table and used as backup routes in case of primary route failure.
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Your company is running IGRP using an AS of 10. You want to configure EIGRP on the network but want to migrate slowly to EIGRP and don't want to configure redistribution. What command would allow you to migrate over time to EIGRP without configuring redistribution?
A:
router eigrp 11
B:
router eigrp 10
C:
router eigrp 10 redistribute igrp
D:
router igrp combine eigrp 10
Answer: B
If you enable EIGRP on a router with the same autonomous system (AS) number, EIGRP will automatically redistribute IGRP into EIGRP. You will see the IGRP injected routes as external (EX) routes with an EIGRP AD of 170. This is a nice feature that lets you migrate slowly to EIGRP with no extra configuration.
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What is the administrative distance of OSPF?
A:
90
B:
100
C:
110
D:
120
Answer: C
The administrative distance (AD) is a very important parameter in a routing protocol. The lower the AD, the more trusted the route. If you have IGRP and OSPF running, by default IGRP routes would be placed in the routing table because IGRP has a lower AD of 100. OSPF has an AD of 110. RIPv1 and RIPv2 both have an AD of 120, and EIGRP is the lowest, at 90.
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