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Questions and Problems

Section 8-1

  1. What is the size of the IPv6 address?
  2. What is a datagram?
  3. How many bits are used to define the IPv4 source and destination address?
  4. How many bits are used to define the IPv6 source and destination address?
  5. Why is IPv6 faster than IPv4 for transferring packets?
  6. At what layer is error detection performed in IPv6?
  7. What is IPsec?
  8. How is IPsec enabled with IPv6?
  9. How are broadcasts handled in IPv6?
  10. Why is DHCP not required in IPv6?

Section 8-2

  1. How many bits are in an IPv6 address?
  2. IPv6 numbers are written in what format?
  3. Express the following IPv6 numbers using double-colon notation:

    1. 5355:4821:0000:0000:0000:1234:5678:FEDC
    2. 0000:0000:0000:1234:5678:FEDC:BA98:7654
    3. 1234:5678:ABCD:EF12:0000:0000:1122:3344
  4. Express the IPv4 IP address in IPv6 form using dotted decimal.
  5. Recover the following IPv6 address from the following double-colon notation:

    • 1234:5678::AFBC
  6. Define the structure of the 6to4 prefix.
  7. What is the purpose of the 6to4 relay router?
  8. What does it mean to have a full IPv6 address?
  9. What is the network prefix for the following IPv6 address and how big is the network prefix?

    • 2001:1234:ABCD:5678::10/64
  10. What is the length of the interface identifier in IPv6?
  11. These types of addresses started with FF00::/8:

    1. Anycast
    2. Multicast
    3. Global unicast
    4. Link-local
    5. None of these answers are correct
  12. This address is only deliverable to the nearest node.

    1. Anycast
    2. Multicast
    3. Global unicast
    4. Link-local
    5. None of these answers are correct
  13. The range of these addresses starts with 2000::/3.

    1. Anycast
    2. Multicast
    3. Global unicast
    4. Link-local
    5. None of these answers are correct
  14. The network prefix for this address is FE80::/10.

    1. Anycast
    2. Multicast
    3. Global unicast
    4. Link-local
    5. None of these answers are correct
  15. The IPv6 addresses are equivalent to public addresses in IPv4.

    1. Anycast
    2. Multicast
    3. Global unicast
    4. Link-local
    5. None of these answers are correct
  16. This type of address can be thought of as a cross between unicast and multicast addresses.

    1. Anycast
    2. Multicast
    3. Global unicast
    4. Link-local
    5. None of these answers are correct
  17. Every IPv6 interface will have at least one of these addresses.

    1. Anycast
    2. Multicast
    3. Global unicast
    4. Link-local
    5. None of these answers are correct
  18. These types of IPv6 addresses can be thought of as private addresses in IPv4.

    1. Anycast
    2. Multicast
    3. Global unicast
    4. Link-local
    5. None of these answers are correct
  19. The 001 of this address indicates it is what type of address?

    1. Anycast
    2. Multicast
    3. Global unicast
    4. Link-local
    5. None of these answers are correct
  20. These types of IDs are administered by IANA.

    1. FP ID
    2. SLA ID
    3. LA ID
    4. Interface ID
    5. None of these answers are correct
  21. This type of ID is used to indicate an interface on a specific subnet.

    1. FP ID
    2. SLA ID
    3. TLA ID
    4. Interface ID
    5. None of these answers are correct
  22. This ID is used to identify subnet within the site.

    1. FP ID
    2. SLA ID
    3. TLA ID
    4. Interface ID
    5. None of these answers are correct

Section 8-3

  1. This type of operating system has no manual configuration mode for assigning the IPv6 address.
  2. In regard to subnet address length in IPv6, the default value for unicast addresses is

    1. 32
    2. 64
    3. 128
    4. None of these answers are correct
  3. All the machines in a network are running IPv6 enabled in the automatic configuration mode. What mode is this, and what does this mean?
  4. Which of the following types of IPv6 address is self-configured?

    1. Anycast
    2. Multicast
    3. Global unicast
    4. Link-local
    5. None of these answers are correct
  5. How many DNS root servers are there in the world?
  6. Why does a computer issue a neighbor solicitation message?

    1. To discover the unicast address of another IPv6 node
    2. To discover the anycast address of another IPv6 node
    3. To discover the link-layer address of another IPv6 node
    4. To discover the global unicast address of another IPv6 node
  7. The process of detecting another machine with the same IPv6 address is called which of the following?

    1. Duplicate Address Detection
    2. Redundant Address Detection
    3. Stateless Address Detection
    4. Global Address Detection
  8. What is the benefit of the “Privacy Extensions for Stateless Address Autoconfiguration in IPv6?”

Section 8-4

  1. For multicast group management, IPv6 uses which of the following?

    1. Unicast Listener Discovery
    2. Stateless Listener Discovery
    3. Unicast Listener Discovery
    4. Multicast Listener Discovery
  2. What global command is used to enable IPv6 unicast packet forwarding on Cisco routers?
  3. To enable IPv6 on an interface, which of the following commands must be entered?

    1. ipv6 enable
    2. ipv6 configure
    3. ipv6 interface
    4. ipv6 routing
  4. The following information is displayed after entering the show running-config command:
    interface GigabitEthernet1/1
     no ip address
     ipv6 enable

    This information verifies which of the following? (Select all that apply.)

    1. IPv4 is configured.
    2. Interface ge1/1 is configured.
    3. IPv6 is enabled.
    4. Interface status is ip.
  5. The show ipv6 interface gigabitEthernet 3/1 command is entered on a router. The address GigabitEthernet3/1 FE80::217:DFFF:FEF5:1000 is listed. What type of address is this?
  6. The command ipv6 address 2001:DC21:2244:3311::1/64 is entered on a router. What is the network prefix of this address and what is its length? What is the command doing?
  7. What is the EUI option?
  8. What is the purpose of the network discovery protocol in IPv6?
  9. What is the purpose of the router solicitation message in IPv6?

Section 8-5

  1. What is the following command showing?
    Router(config)# ipv6 route 2001:0db8:ABCD::/32 FA0/0
  2. List the command to create a static route for 2001:0db8:1234::/32 that points to the global network 2001:0db8:ABCD::1.
  3. Create a static route for 2001:0db8:1234::/32 off the FA0/0 interface that gives the link-local next hop address, which is specified with the fe80::1 prefix.
  4. What is RIPng and what is it used for?
  5. What is the multicast address for RIPng?
  6. List the command that is used to enable RIPng on Cisco routers.
  7. What is the purpose of the rip tag?
  8. What version of OSPF is used with IPv6?
  9. What are the IPv6 link-local multicast addresses for routers and the link-local addresses for designated routers?
  10. What command is used to configure OSPF routing for IPv6, using a process ID of 50?
  11. What does the following command do?
    Router(config-if)# ipv6 ospf 50 area
  12. What is the IPv6 link-local multicast addresses for EIGRP? What is the link-local address used for in IPv6?
  13. What is the command for enabling EIGRP for IPv6 with a specified AS of 100?
  14. List the configuration for enabling ISIS for IPv6. List the router prompts and all commands required for enabling IS-IS on the Gig1/1 interface. Use a net address of 49.0002.b123.a456.0012.00.

Section 8-6

  1. What command is used to view the /TCP/IP setting in Windows?
  2. What command is used to view the /TCP/IP setting in Linux?
  3. What is the purpose of the ping6 command?
  4. What is the purpose of the traceroute6 or tracert6 command in IPv6?
  5. List three things that should be answered before troubleshooting IPv6 connectivity?

Critical Thinking

  1. Your boss read about IPv6 and wants to know if the network you oversee is ready for the transition. Prepare a response based on the networking and computer operating systems used in your facility.
  2. The show ipv6 interface command is issued to examine a router’s R1 interface. The interface has been configured with an IPv6 address. Where is the MAC address of the interface found?
    R1# sh ipv6 interface
    Serial0/0/0 is up, line protocol is up
    IPv6 is enabled, link-local address is
    No Virtual link-local address(es):
    Global unicast address(es):
    2001:C16C:0:1::1, subnet is 2001:C16C:0:1::/64
    Joined group address(es):
    MTU is 1500 bytes
    ICMP error messages limited to one every 100 milliseconds
    ICMP redirects are enabled
    ICMP unreachables are sent
    ND DAD is enabled, number of DAD attempts: 1
    ND reachable time is 30000 milliseconds
    Hosts use stateless autoconfig for addresses.
  3. What is the purpose of the command ipv6 address 2001:C16C:0:2:213:19FF:FE7B:1101/64 eui-64?
  4. Answer the following for the given IPv6 address: 2001:C15C:0000:0001:0000:0000:0000:0001/64

    1. Write this address using double colon notation
    2. Identify the network prefixs

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