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Border Gateway Protocol, Route Manipulation, and IP Multicast

Chapter Description

Anthony Bruno and Steve Jordan covers the Border Gateway Protocol (BGP), route summarization and redistribution of route information between routing protocols, policy-based routing (PBR), and IP multicast protocols for use in preparation for the CCDA exam.

Q&A

As mentioned in the Introduction, you have two choices for review questions: here in the book or the exam questions on the CD-ROM. The answers to these questions appear in Appendix A.

For more practice with exam format questions, use the exam engine on the CD-ROM.

  1. True or false: You use iBGP to exchange routes between different autonomous systems.

  2. True or false: BGP Version 4 includes support for CIDR.

  3. True or false: eBGP and iBGP redistribute automatically on a router if the BGP peers are configured with the same AS number.

  4. Use _______ to modify the next hop of packets based on source IP address.

  5. eBGP routes have an administrative distance of ____, and iBGP routes have an administrative distance of ____.

  6. True or false: IGMP snooping and CGMP are methods to reduce the multicast traffic at Layer 2.

  7. True or false: PIM has a 32 hop-count limit.

  8. True or false: PIM-SM routers use the multicast 224.0.0.13 address to request a multicast group to the RP.

  9. True or false: AS path is the only attribute BGP uses to determine the best path to the destination.

  10. List three IP routing protocols that use multicast addresses to communicate with their neighbors.

  11. What IPv6 multicast address does EIGRP use for IPv6?

  12. Match the IP multicast address with its description:

    1. 224.0.0.1
    2. 224.0.0.2
    3. 224.0.0.5
    4. 224.0.0.10
    1. All OSPF routers
    2. All routers
    3. EIGRP routers
    4. All hosts
  13. Match the BGP attribute with its description:

    1. Local preference
    2. MED
    3. AS path
    4. Next hop
    1. IP address
    2. Indicates the path used to exit the AS
    3. Tells external BGP peers the preferred path into the AS
    4. List of AS numbers
  14. Which Cisco feature can you use instead of local preference to influence the selected path to external BGP routers?

  15. What is the purpose of route reflectors?

  16. When BGP confederations are used, which number do external peers see?

  17. With ___________ all routers peer with each other within the private AS, and with __________ client routers peer only with the reflector.

  18. Which of the following shows the correct order that BGP uses to select a best path?

    1. Origin, lowest IP, AS path, weight, local preference, MED
    2. Weight, local preference, AS path, origin, MED, lowest IP
    3. Lowest IP, AS path, origin, weight, MED, local preference
    4. Weight, origin, local preference, AS path, MED, lowest IP
  19. What feature did BGPv4 implement to provide forwarding of packets based on IP prefixes?

  20. What route should be used to summarize the following networks?

    10.150.80.0/23, 10.150.82.0/24, 10.150.83.0/24, 10.150.84.0/22

    1. 10.150.80.0/23, 10.150.82.0/23, and 10.150.84.0/22
    2. 10.150.80.0/22 and 10.150.84/22
    3. 10.150.80.0/21
    4. 10.150.80.0/20
  21. Match the IPv6 multicast address with its description:

    1. FF02::1
    2. FF02::2
    3. FF02::5
    4. FF02::9
    5. FF02::A
    1. OSPFv3 routers
    2. RIPng routers
    3. All routers
    4. EIGRP routers
    5. All nodes
  22. Route summarization and redistribution occur in which layer of the hierarchical model?

    1. Building access
    2. Distribution
    3. Core
    4. Server access
  23. Which of the following best describes route summarization?

    1. Grouping contiguous addresses to advertise a large Class A network
    2. Grouping noncontiguous addresses to advertise a larger network
    3. Grouping contiguous addresses to advertise a larger network
    4. Grouping Internet addresses

    Refer to Figure 12-17 to answer the following questions.

    Figure 12-17

    Figure 12-17 Network Scenario

  24. Where should you configure BGP?

    1. Routers A and B
    2. Routers C and D
    3. Answers A and B
    4. Routers A and C
  25. On which router should you configure redistribution for OSPF and EIGRP?

    1. Router A only
    2. Router B only
    3. Routers A and B
    4. Redistribution occurs automatically.
  26. To announce the networks from AS 100 to AS 500, which routing protocols should you redistribute into BGP?

    1. OSPF only
    2. EIGRP only
    3. OSPF and EIGRP
    4. iBGP
  27. Where should you use filters?

    1. Routers A and B
    2. Routers C and D
    3. Routers A and C
    4. Answers A and B