Testing for Understanding

To test your understanding of IPv6 ND, answer the following questions. See Appendix D to check your answers.

  1. List the IPv4 facilities that are replaced by the IPv6 ND protocol.
  2. List the capabilities of the IPv6 ND protocol that are not present in IPv4.
  3. List the five different ND messages and the options that can be included with them.
  4. Describe the interpretation of the Length field in ND options.
  5. What is the value of the Length field for a maximum-sized Redirected Header option (assuming no IPv6 extension headers are present)?
  6. Describe how you would use the MTU option to provide seamless connectivity between Ethernet nodes and ATM nodes on a transparently bridged link.
  7. Why is the Source Link-Layer Address option not included in the Neighbor Solicitation message sent during duplicate address detection?
  8. Describe the configuration parameters and their corresponding fields sent in the Router Advertisement message (not including options). Describe the configuration parameters and their corresponding fields sent in the Prefix Information option.
  9. Under what circumstances is an unsolicited Neighbor Advertisement message sent?
  10. What are the differences in address resolution and duplicate address detection node behavior for anycast addresses?
  11. Why is the response to a duplicate address detection sent as multicast? Who sends the response, the offending or defending node?
  12. Why is the value of the Hop Limit field set to 255 for all ND messages?
  13. Describe the purpose of each of the host data structures described in RFC 2461.
  14. What field in the Redirect message contains the next-hop address of the better router to use for packets addressed to a specific destination? Describe how the contents of that field are used to update the conceptual host data structures for subsequent data sent to the destination.
  15. Under what circumstances does a router send a Router Advertisement?
  16. For Host A and Host B on the same link, why is the exchange of a Neighbor Solicitation message (sent by Host A to Host B) and a Neighbor Advertisement message (sent by Host B to Host A) not considered by Host B as proof that Host A is reachable?
  17. What is the next-hop address of a destination set to for a host that does not have a prefix matching the destination address or a default router?

Understanding IPv6
Understanding Ipv6
ISBN: 0735612455
EAN: 2147483647
Year: 2005
Pages: 124
Authors: Joseph Davies

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