Section 55 – Review 13

Section 55 Tasks

  • Take the exam below
  • Complete the challenge lab
  • Review the subject of your choice
  • Write out the ICND2 cram guide (and the ICND1 cram guide, if taking the CCNA exam) from memory
  • Spend 15 minutes on the website

Section 55 Exam

  1. Name at least three reasons for EIGRP neighbour relationships not forming.
  2. Which command can you use to verify EIGRP K values?
  3. Which command can you use to verify EIGRP packets statistics?
  4. Name at least two common reasons for EIGRP route installation failures.
  5. The administrative distance concept is used to determine how reliable the route source is. True or false?
  6. By default, EIGRP automatically summarises at classful boundaries and creates a summary route pointing to the Null0 interface. True or false?
  7. Name the command you can use to debug FSM events.
  8. Which command can you use to see the originating router ID of a specific prefix?
  9. Which command can you use to show the EIGRP event log?
  10. What is the best command to use when debugging various routing issues?

Section 55 Answers

  1. The neighbour routers are not on a common subnet; mismatched primary and secondary
    subnets; mismatched K values; mismatched ASN; ACLs are filtering EIGRP packets; Physical
    Layer issues; Data Link Layer issues; and mismatched authentication parameters.
  2. The show ip protocols command.
  3. The show ip eigrp traffic command.
  4. The same route is received via another protocol with a lower administrative distance;
    EIGRP summarisation; duplicate router IDs are present within the EIGRP domain; and the
    routes do not meet the Feasibility Condition.
  5. True.
  6. True.
  7. The debug eigrp fsm command.
  8. The show ip eigrp topology x.x.x.x y.y.y.y command.
  9. The show ip eigrp events command.
  10. The debug ip routing command.

Section 55 Lab – OSPF and NAT



Connect three routers together with a serial or crossover cable:

  1. Add IP addresses to the routers and Loopback interfaces on Routers A, B, and C, according to the diagram
  2. Ping between Routers A and B and between Routers B and C to test the serial lines (remember clock rates)
  3. Now set the serial lines to use PPP with CHAP (also set usernames and passwords)
  4. Configure OSPF on all routers; put one Loopback on either end in a non-zero area, but do not add to OSPF
  5. Check the routing tables and make sure that you include both of the 192.168.1.x networks
  6. Create a NAT pool of to 10/24, inclusive, on Router A; set an ACL to match the subnet
  7. Set a static route on Router B for traffic destined to to next-hop
  8. Turn on NAT debugging on Router A, and do an extended ping from to Router B

Solution Hints and Commands

  • Use the ip address on interface command to set an IP address
  • CHAP: username and password for remote peer, ppp authentication chap on interfaces
  • Use the router ospf x command to enter Router Configuration mode
  • Define networks under the router ospf command with a network statement
  • Use the ip access-list command for named ACLs
  • Use the ip route command for static route configuration
  • debug ip nat

NOTE: The two networks on Router B are and


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