IPv6 Questions and Answers

Answer: B

Correct answer: These are your typical publicly routable addresses, just like a regular publicly routable address in IPv4.

A global unicast address is the ordinary routable kind, currently allocated from 2000::/3, and it is the direct equivalent of a public IPv4 address. What distinguishes it from the other unicast types is precisely that it is intended to be routed across the internet.

Answer: B

In order to shorten the written length of an IPv6 address, successive fields of zeros may be replaced by double colons. In trying to shorten the address further, leading zeros may also be removed. Just as with IPv4, a single device's interface can have more than one address; with IPv6 there are more types of addresses and the same rule applies. There can be link-local, global unicast, and multicast addresses all assigned to the same interface.

Answer: A

Correct answer: FF02::A

EIGRPv6 uses FF02::A, the counterpart of 224.0.0.10 in IPv4. The hexadecimal A is ten, so the last digits of the IPv4 groups carry straight over - 9 for RIP, 10 for EIGRP, 5 and 6 for OSPF - which is the easiest way to remember all four.

Answer: B

Correct answer: 3, 4 and 5

EIGRPv6 needs three things, unlike the other two protocols. The process is created in global configuration mode with ipv6 router eigrp 10; it starts up shut down, so no shutdown must be entered under the router prompt; and each participating interface is enabled with ipv6 eigrp 10. Omitting the no shutdown is the classic reason an otherwise correct EIGRPv6 configuration forms no adjacency.

Answer: C

Correct answer: These are like private addresses in IPv4 in that they are not meant to be routed.

A link-local address begins FE80::/10, is configured automatically on every IPv6 interface, and is valid only on the link it sits on - no router will forward it. It is what neighbour discovery and the routing protocols use to talk to devices on the same segment, so an interface can be fully operational for routing purposes with no global address at all.

Answer: C

Correct answer: ping ::1

The IPv6 loopback is ::1 - 127 zero bits followed by a one, written in its shortest form. 127.0.0.1 is the IPv4 loopback, and 0.0.0.0 is the unspecified address, whose IPv6 equivalent is :: rather than ::1.