Chapter 17: Quiz – Troubleshooting Redistribution (Answers) CCNPv8 ENARSI

1. A network engineer is implementing redistribution of two routing protocols across a network topology. Under which situation would there be minimal concern of network visibility being hidden from the destination routing source?

  • when there is only one point of redistribution between two sources
  • while performing multipoint redistribution between multiple protocols
  • while performing multipoint redistribution between a single routing protocol of varying process-id or autonomous-system number
  • when there are at least two points of redistribution in the network

Explanation: While performing redistribution between varying routing protocols, network visibility is lost or hidden from the destination routing source. However, this is not an issue when there is only one point of redistribution between two sources.

2. A boundary router is running both OSPF and BGP. What is required for the redistribution process to successfully redistribute source information into the BGP process?

  • The BGP process must have a route-map configured in order to set a metric for successful redistribution.
  • The OSPF process must use a default metric as the routing source redistributing information into the BGP process.
  • The source information must be filtered using an ACL to specify only NSSA routes during the redistribution process for BGP.
  • The route to be redistributed must have a current entry in the routing table from the source routing protocol.

Explanation: In order for any source information to be redistributed into a destination routing process, that information must currently exist within the source routing protocol RIB. If the route is removed from the source routing protocol RIB, the information is no longer able to be redistributed into the destination routing process.

3. Refer to the exhibit. A network engineer has issued the exhibited commands on a boundary router. What is the result of these commands?

Chapter 17: Quiz - Troubleshooting Redistribution (Answers) CCNPv8 ENARSI 3

  • The internal administrative distance for EIGRP AS 100 has been changed to 255.
  • The default seed metric for EIGRP AS 100 has been changed to 255.
  • The external administrative distance for EIGRP AS 100 has been configured to not install external routes in the RIB.
  • The EIGRP AS 100 process has been configured to install external routes in the RIB with a metric between 100 and 255.

Explanation: The EIGRP configuration command distance eigrp ad-internal ad-external is used to modify the default administrative distance on IOS routers. The valid values for the AD are between 1 and 255; a value of 255 stops the installation of the route into the routing information base (RIB).

4. Which two statements define the behavior of a seed metric between dissimilar routing protocols? (Choose two.)

  • It creates a distribute-list in global configuration mode.
  • It uses the default-metric command.
  • It creates an access-list in global configuration mode.
  • It defines a prefix list in global configuration mode.
  • It applies a route map configuration to the redistribute command.

Explanation: There are three ways to define a seed metric when working with dissimilar routing protocols:

  • Uses the default-metric command.
  • Uses the metric parameter with the redistribute command.
  • Applies a route map configuration to the redistribute command.

5. Which keyword is not supported when redistributing IPv6 from a source to a destination routing protocol?

  • match
  • route-map
  • subnets
  • metric

Explanation: The subnets keyword is not an option with IPv6 routing protocols because the concepts classful and classless do not exist with IPv6.

6. A network engineer is troubleshooting suboptimal routing on a network that may utilize redundant route redistribution. What should the engineer verify first?

  • The engineer should verify the route tags being implemented within the redistribution process on the boundary router.
  • The engineer should verify the default seed metrics being used within the redistribution process.
  • The engineer should verify the subnets keyword being used within the redistribution process.
  • The engineer should verify that mutual redistribution is occurring at multiple points in the network.

Explanation: When troubleshooting suboptimal routing caused by redistribution, a network engineer must be able to recognize that mutual redistribution is occurring at multiple points in the network.

7. A network engineer is reviewing the network topology and verifying route entries of a specific boundary router. What is the administrative distance of a route that was sourced as a directly connected network, advertised locally through RIP, redistributed into EIGRP, and then redistributed into OSPF?

  • 170
  • 90
  • 110
  • 120
  • 1

Explanation: If there is no manual configuration using a distance command or route-map, the AD value of a source route will be modified by the destination routing process according to the default AD used by that routing process. OSPF is the last routing protocol to have source information redistributed into it and it has a single AD value of 110.

8. While implementing redistribution in a network topology, what is the function of the boundary router?

  • to keep broadcasts contained within a layer 2 segment
  • to separate the public resources from the private resources
  • to connect two or more routing domains
  • to limit end-to-end connectivity by modifying IP headers in outgoing packets

Explanation: While utilizing redistribution in a network topology, a boundary router is the router that connects two or more routing domains and this router will be the point of redistribution.

9. Refer to the exhibit. A network engineer is troubleshooting a configuration for EIGRP and OSPF redistribution. Why is the OSPF process not receiving the redistributed EIGRP routes?

Chapter 17: Quiz - Troubleshooting Redistribution (Answers) CCNPv8 ENARSI 4

  • The EIGRP routing protocol is not activated on interface Gi0/0/1.
  • The OSPF routing protocol is using an unreachable metric.
  • The EIGRP routing protocol is not configured for mutual redistribution.
  • The OSPF routing protocol has an incorrect administrative distance configured.

Explanation: When troubleshooting redistribution, it is important to verify that the source routing protocol is configured correctly and has learned the routes before attempting to redistribute them. Because of a typo in the EIGRP 100 network command, EIGRP is not activated on the Gig0/0/1 interface.

10. A network engineer is verifying the successful redistribution of EIGRP routes into an OSPF routing process. What should the engineer do on the boundary router to verify the reachable IPv4 addresses on the neighbor EIGRP routers?

  • Issue the show ip eigrp neighbors command.
  • Issue the show cdp neighbors command.
  • Issue the show cdp neighbors detail command.
  • Issue the show ipv6 eigrp topology command.

Explanation: When troubleshooting EIGRP and OSPF mutual redistribution, it is important to verify that the source routing protocol is configured correctly. In order to verify the IP addresses configured on the physical interfaces of a neighboring router, the show cdp neighbors detail command should be used.

11. A reachability issue is reported by users in a network topology that utilizes OSPFv2 and redistribution. What is the first step that a junior administrator should take in troubleshooting this issue?

  • Verify the loss of reachability using a ping with a source IP and destination IP set.
  • Verify the loss of the destination network in the routing table of the boundary router.
  • Verify the loss of the network entry in the OSPF database on the boundary router.
  • Verify the OSPF neighbor adjacencies that exist on the boundary router.

Explanation: The first step that should be taken when approached with a user ticket is to verify the problem exists and attempt to locate the point of failure. A ping or traceroute is the best way to start troubleshooting connectivity concerns.


Related Articles

guest
0 Comments
Inline Feedbacks
View all comments