Qa

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: OSPFv2 supports IPv6.

2. True or false: DNS A6 records are used in IPv6 networks for name-to-IPv6-address resolution.

3. Fill in the blank: IPv6 ND is similar to what_does for IPv4 networks.

4. How many bits are there between the colons of IPv6 addresses?

5. The first field of the IPv6 header is 4 bits in length. What binary number is it always set to?

6. True or false: DHCP is required for dynamic allocation of IPv6 addresses.

7. IPv6 multicast addresses begin with what hexadecimal numbers?

8. IPv6 link-local addresses begin with what hexadecimal prefix?

9. True or false: 6to4 allows tunneling of IPv6 through IPv4 networks.

10. List the eight fields of the IPv6 header.

11. Which of the following is not an IPv6 address type?

a. Unicast b. Broadcast c. Anycast d. Multicast

12. True or false: The IPv6 address 2001:0:0:1234:0:0:0:abcd can be represented as 2001::1234:0:0:0:abcd and 2001:0:0:1234::abcd.

13. What is the subnet prefix of 2001:1:0:ab0:34:ab1:0:1/64?

14. The IPv6 address has 128 bits. How many hexadecimal numbers does an IPv6 address have?

15. What type of IPv6 address is the following? FF01:0:0:0:0:0:0:2

16. What is the compact format of the address 2102:0010:0000:0000:0000:fc23:0100:00ab?

a. 2102:10::fc23:01:ab b. 2102:001::fc23:01:ab c. 2102:10::fc23:100:ab d. 2102:0010::fc23:01:ab

17. When using the dual-stack backbone, which of the following statements is correct?

a. The backbone routers have IPv4/IPv6 dual stacks, and end hosts do not.

b. The end hosts have IPv4/IPv6 dual stacks, and backbone routers do not.

c. Both the backbone routers and end hosts have IPv4/IPv6 dual stacks.

d. Neither the backbone routers nor end hosts have IPv4/IPv6 dual stacks.

18. How does a dual-stack host know which stack to use to reach a destination?

a. It performs an ND, which returns the destination host type.

b. It performs a DNS request that returns the IP address. If the returned address is IPv4, the host uses the IPv4 stack. If the returned address is IPv6, the host uses the IPv6 stack.

c. The IPv6 stack makes a determination. If the destination is IPv4, the packet is sent to the IPv4 stack.

d. The IPv4 stack makes a determination. If the destination is IPv6, the packet is sent to the IPv6 stack.

19. Name at least two transition methods or technologies used to migrate from IPv4 to IPv6.

20. Which of the following describe(s) the IPv6 header?

a. It is 40 bytes in length.

b. It is of variable length.

c. The Protocol Number field describes the upper-layer protocol.

d. The Next Header field describes the upper-layer protocol.

21. Which of the following is true about fragmentation?

a. Routers between source and destination hosts can fragment IPv4 and IPv6 packets.

b. Routers between source and destination hosts cannot fragment IPv4 and IPv6 packets.

c. Routers between source and destination hosts can fragment IPv6 packets only. IPv4 packets cannot be fragmented.

d. Routers between source and destination hosts can fragment IPv4 packets only. IPv6 packets cannot be fragmented.

22. A packet sent to an anycast address reaches what?

a. The nearest destination in a set of hosts b. All destinations in a set of hosts c. Broadcasts to all hosts d. Global unicast destinations

23. Which of the following is/are true about IPv6 and IPv4 headers?

a. The IPv6 header is of fixed length, and the Next Header field describes the upper-layer protocol.

b. The IPv4 header is of variable length, and the Protocol field describes the upper-layer protocol.

c. The IPv6 header is of fixed length, and the Protocol field describes the upper-layer protocol.

Answer the following questions based on the scenario and figure.

A company has an existing WAN that uses IPv4. Sites C and D use IPv4. As shown in Figure 8-10, the company plans to add two new locations (Sites A and B). The new sites will implement IPv6. The company does not want to lease more WAN circuits.

Figure 8-10 Company Adds Sites A and B

Figure 8-10 Company Adds Sites A and B

Answer the following questions. 24. What options does the company have to connect Site A to Site B?

25. What mechanism needs to be implemented so that IPv6 hosts can communicate with IPv4 hosts and vice versa?

26. If a dual-stack backbone is implemented, do all WAN routers and all hosts need an IPv6-IPv4 dual stack?

27. If an IPv4 tunnel is implemented between Sites A and B, do all WAN routers require an IPv6-IPv4 dual stack?

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