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Cisco Self-Study: Implementing Cisco IPv6 Networks (IPV6)

Chapter Description

Discover the ins and outs of the new IPv6 header format. You will also learn different configuration processes of IPv6 in relation to Cisco.

Review Questions

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

 

  1. For each of the fields in the following table, give the field's length and indicate whether it is used in the IPv4 header or IPv6 header.

    Field

    Length in Bits

    IPv4 Header

    IPv6 Header

    Type of Service

     

     

     

    Identification

     

     

     

    Version

     

     

     

    Time to live

     

     

     

    Header checksum

     

     

     

    Header length

     

     

     

    Traffic Class

     

     

     

    Total Length

     

     

     

    Flow Label

     

     

     

    Flags

     

     

     

    Padding

     

     

     

    Extension header

     

     

     

    Payload Length

     

     

     

    Protocol Number

     

     

     

    Hop Limit

     

     

     

    Source Address

     

     

     

    Destination Address

     

     

     

    Options

     

     

     

    Next Header

     

     

     

    Fragment Offset

     

     

     


  2. List the fields removed from the IPv4 header.

  3. What new field is added in the IPv6 header?

  4. Describe the use of the Next Header field in the IPv6 header.

  5. List the extension headers that may be placed after the basic IPv6 header, and place them in the order they must appear.

  6. What is mandatory with UDP when used over IPv6?

  7. What is recommended as a mechanism for nodes in IPv6 to avoid fragmentation?

  8. What are IPv6's minimum MTU and recommended minimum MTU?

  9. What are the three representations of IPv6 addresses?

  10. Compress the following IPv6 addresses into the shortest form possible.

    Preferred Representation

    Compressed Representation

    A0B0:10F0:A110:1001:5000:0000:0000:0001

     

    0000:0000:0000:0000:0000:0000:0000:0001

     

    2001:0000:0000:1234:0000:0000:0000:45FF

     

    3ffe:0000:0010:0000:1010:2a2a:0000:1001

     

    3FFE:0B00:0C18:0001:0000:1234:AB34:0002

     

    FEC0:0000:0000:1000:1000:0000:0000:0009

     

    FF80:0000:0000:0000:0250:FFFF:FFFF:FFFF

     


  11. Describe the IPv6 address representation for URL.

  12. List the three kinds of addresses in the IPv6 addressing architecture.

  13. For each of the following address types, find the IPv6 prefix and write the address in the compressed representation.

    Unspecified
    Loopback
    IPv4-compatible IPv6
    Link-local
    Site-local
    Multicast
    Solicited-node multicast
    Aggregatable global unicast

  14. What is a link-local address?

  15. What is similar to the site-local address in IPv4?

  16. In the following table, list the solicited-node multicast address that corresponds to each unicast address.

    Unicast Address

    Solicited-Node Multicast Address

    A0B0:10F0:A110:1001:5000:0000:0000:0001

     

    2001:0000:0000:1234:0000:0000:0000:45FF

     

    3ffe:0000:0010:0000:1010:2a2a:0000:1001

     

    3FFE:0B00:0C18:0001:0000:1234:AB34:0002

     

    FEC0:0000:0000:1000:1000:0000:0000:0009

     


  17. Give the length in bits of the host and site parts of an aggregatable global unicast IPv6 address.

  18. What three prefixes are assigned by IANA and are available as public addresses in IPv6?

  19. What is the Cisco IOS Software command to enable IPv6 on a Cisco router?

  20. What protocol ID is used for IPv6 in Ethernet frames?

  21. Explain how IPv6 multicast addresses are mapped over Ethernet.

  22. Generate IPv6 interface IDs (in EUI-64 format) from the following Ethernet link-layer addresses.

    Ethernet Link-Layer Address

    IPv6 Interface ID

    00:90:27:3a:9e:9a

     

    00:90:27:3a:8d:c3

     

    00:00:86:4b:fe:ce

     


  23. What command assigns one IPv6 address to an interface using EUI-64 format?

  24. What is the goal of the path MTU discovery mechanism?

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