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Configuring the Enhanced Interior Gateway Routing Protocol

  • Sample Chapter is provided courtesy of Cisco Press.
  • Date: Dec 25, 2006.

Review Questions

Answer the following questions, and then refer to Appendix A, "Answers to Review Questions," for the answers.

  1. What are some features of EIGRP?
  2. Is EIGRP operational traffic multicast or broadcast?
  3. What are the four key technologies employed by EIGRP?
  4. How do IGRP and EIGRP differ in their metric calculation?
  5. Which of the following best describes the EIGRP topology table?
    1. It is populated as a result of receiving hello packets.
    2. It contains all learned routes to a destination.
    3. It contains only the best routes to a destination.
  6. Describe the five types of EIGRP packets.
  7. True or false: EIGRP hello packets are sent every 5 seconds on LAN links.
  8. What is the difference between the hold time and the hello interval?
  9. Which of the following statements are true?
    1. A route is considered passive when the router is not performing recomputation on that route.
    2. A route is passive when it is undergoing recomputation.
    3. A route is active when it is undergoing recomputation.
    4. A route is considered active when the router is not performing recomputation on that route.
    5. Passive is the operational state for a route.
    6. Active is the operational state for a route.
  10. Which command is used to see the RTO and hold time?
    1. show ip eigrp traffic
    2. show ip eigrp timers
    3. show ip eigrp route
    4. show ip eigrp neighbors
  11. Why are EIGRP routing updates described as reliable?
  12. What units are the bandwidth and delay parameters in the EIGRP metric calculation?
  13. Which of the following statements are true regarding AD and FD?
    1. The AD is the EIGRP metric for a neighbor router to reach a particular network.
    2. The AD is the EIGRP metric for this router to reach a particular network.
    3. The FD is the EIGRP metric for this router to reach a particular network.
    4. The FD is the EIGRP metric for the neighbor router to reach a particular network.
  14. What does it mean when a route is marked as an FS?
  15. In the following table, place the letter of the description next to the term the description describes. The descriptions may be used more than once.


    1. A network protocol that EIGRP supports.
    2. A table that contains FS information.
    3. The administrative distance determines routing information that is included in this table.
    4. A neighbor router that has the best path to a destination.
    5. A neighbor router that has a loop-free alternative path to a destination.
    6. An algorithm used by EIGRP that ensures fast convergence.
    7. A multicast packet used to discover neighbors.
    8. A packet sent by EIGRP routers when a new neighbor is discovered and when a change occurs.


    Description Letter


    Feasible successor


    Topology table




    Routing table



  16. Answer true or false to the following statements.
    1. EIGRP performs autosummarization.
    2. EIGRP autosummarization cannot be turned off.
    3. EIGRP supports VLSM.
    4. EIGRP can maintain three independent routing tables.
    5. The EIGRP hello interval is an unchangeable fixed value.
  17. Which of the following are true?
    1. For Frame Relay point-to-point interfaces, set the bandwidth to the CIR.
    2. For Frame Relay point-to-point interfaces set the bandwidth to the sum of all CIRs.
    3. For Frame Relay multipoint connections, set the bandwidth to the sum of all CIRs.
    4. For generic serial interfaces such as PPP and HDLC, set the bandwidth to match the line speed.
    5. For Frame Relay multipoint connections, set the bandwidth to the CIR.
  18. Router A has three interfaces with IP addresses,, and What commands would be used to configure EIGRP to run in autonomous system 100 on only the interfaces with addresses and
  19. Routers A and B are connected and are running EIGRP on all their interfaces. Router A has four interfaces, with IP addresses,,, and Router B has two interfaces, with IP addresses and There are other routers in the network that are connected on each of the interfaces of these two routers that are also running EIGRP. Which summary routes does Router A generate automatically?
  20. Router A has four EIGRP paths to a destination with the following EIGRP metrics. Assuming no potential routing loops exist and the command variance 3 is configured on Router A, which paths are included for load balancing?
    1. Path 1: 1100
    2. Path 2: 1200
    3. Path 3: 2000
    4. Path 4: 4000
  21. Router A has the following configuration:

    interface s0
      ip bandwidth-percent eigrp 100 40
      bandwidth 256
    router eigrp 100

    What is the maximum bandwidth that EIGRP uses on the S0 interface?

    1. 100
    2. 40
    3. 256
    4. 102
    5. 10
    6. 47
  22. What is the default EIGRP authentication?
    1. Simple password
    2. MD5
    3. None
    4. IPsec
  23. True or false: When configuring EIGRP authentication, each router must have a unique password configured.
  24. What does the accept-lifetime command do for EIGRP authentication?
  25. What command is used to troubleshoot EIGRP authentication?
    1. debug eigrp authentication
    2. debug ip eigrp packets
    3. debug eigrp packets
    4. debug ip eigrp authentication
  26. What is the default EIGRP stuck-in-active timer?
  27. With the EIGRP active process enhancement, when does the SIA-Query get sent?
  28. How does EIGRP summarization limit the query range?
  29. How does the EIGRP stub feature limit the query range?
  30. What does the eigrp stub receive-only command do?
  31. True or false: Goodbye messages are sent in hello packets.
  32. The following is part of the output of the show ip eigrp topology command:

    P, 1 successors, FD is 10514432
             via (10514432/28160), Serial0/0/0

    What are the two numbers in parentheses?

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