IPv6 Questions and Answers

Q: To enable RIPng, which of the following would you use?

Correct answer: Router1(config-if)# ipv6 router rip 1RIPng is enabled on the interface with ipv6 router rip followed by the process name or tag. As with OSPFv3, the routing protocol is turned on where the traffic is rather than by listing networks under the process - which is the general pattern for the IPv6 routing protocols.

Q: What multicast addresses does RIPng use?

Correct answer: FF02::9RIPng uses FF02::9, which is the IPv6 counterpart of the 224.0.0.9 that RIPv2 used. The link-local multicast group is worth learning as a set: FF02::5 and FF02::6 for OSPFv3, FF02::9 for RIPng, and FF02::A for EIGRPv6.

Q: Which statement(s) about IPv4 and IPv6 addresses are true? 1.An IPv6 address is 32 bits long, represented in hexidecimal. 2.An IPv6 address is 128 bits long, represented in decimal. 3.An IPv4 address is 32 bits long, represented in decimal. 4.An IPv6 address is 128 bits long, represented in hexidecimal.

Correct answer: 3 and 4Statements 3 and 4 are correct: IPv4 is 32 bits written as four decimal octets, and IPv6 is 128 bits written as eight groups of four hexadecimal digits. Statement 1 gives IPv6 the length of IPv4, and statement 2 gives it the wrong notation. The move from 32 to 128 bits is a factor of \( 2^{96} \) in address space, not four.

To enable OSPFv3, which of the following would you use?

A.Router1(config-if)# ipv6 ospf 10 area 0.0.0.0
B.Router1(config-if)# ipv6 router rip 1
C.Router1(config)# ipv6 router eigrp 10
D.Router1(config-rtr)# no shutdown
E.Router1(config-if)# ipv6 eigrp 10

Answer: A

Correct answer: Router1(config-if)# ipv6 ospf 10 area 0.0.0.0

OSPFv3 is enabled per interface, giving the process ID and the area in one command, so the prompt must be interface configuration mode. It differs from OSPFv2, which is configured under the routing process with network statements - in version 3 the interface command replaces them entirely.

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To enable RIPng, which of the following would you use?

A.Router1(config-if)# ipv6 ospf 10 area 0.0.0.0
B.Router1(config-if)# ipv6 router rip 1
C.Router1(config)# ipv6 router eigrp 10
D.Router1(config-rtr)# no shutdown
E.Router1(config-if)# ipv6 eigrp 10

Answer: B

Correct answer: Router1(config-if)# ipv6 router rip 1

RIPng is enabled on the interface with ipv6 router rip followed by the process name or tag. As with OSPFv3, the routing protocol is turned on where the traffic is rather than by listing networks under the process - which is the general pattern for the IPv6 routing protocols.

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What multicast addresses does RIPng use?

A.FF02::A
B.FF02::9
C.FF02::5
D.FF02::6

Answer: B

Correct answer: FF02::9

RIPng uses FF02::9, which is the IPv6 counterpart of the 224.0.0.9 that RIPv2 used. The link-local multicast group is worth learning as a set: FF02::5 and FF02::6 for OSPFv3, FF02::9 for RIPng, and FF02::A for EIGRPv6.

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Which of the following is true when describing a unique local address?

A.Packets addressed to a unicast address are delivered to a single interface.
B.These are your typical publicly routable addresses, just like a regular publicly routable address in IPv4.
C.These are like private addresses in IPv4 in that they are not meant to be routed.
D.These addresses are meant for nonrouting purposes, but they are almost globally unique so it is unlikely they will have an address overlap.

Answer: D

These addresses are meant for nonrouting purposes like link-local, but they are almost globally unique so it is unlikely they will have an address overlap. Unique local addresses were designed as a replacement for site-local addresses.

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What two multicast addresses does OSPFv3 use?

1.FF02::A

2.FF02::9

3.FF02::5

4.FF02::6

A.2 only
B.3 only
C.1 and 3
D.3 and 4

Answer: D

Adjacencies and next-hop attributes now use link-local addresses, and OSPFv3 still uses multicast traffic to send its updates and acknowledgments with the addresses FF02::5 for OSPF routers and FF02::6 for OSPF designated routers. These are the replacements for 224.0.0.5 and 224.0.0.6, respectively.

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Which of the following is true when describing an anycast address?

A.Packets addressed to a unicast address are delivered to a single interface.
B.Packets are delivered to all interfaces identified by the address. This is also called one-to-many addresses.
C.This address identifies multiple interfaces and the anycast packet is only delivered to one address. This address can also be called one-to-one-of-many.
D.These addresses are meant for nonrouting purposes, but they are almost globally unique so it is unlikely they will have an address overlap.

Answer: C

Anycast addresses identify multiple interfaces, which is the same as multicast; however, the big difference is that the anycast packet is only delivered to one address, the first one it finds defined in the terms of routing distance. This address can also be called one-to-one-of-many.

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Which statement(s) about IPv4 and IPv6 addresses are true?

1.An IPv6 address is 32 bits long, represented in hexidecimal.

2.An IPv6 address is 128 bits long, represented in decimal.

3.An IPv4 address is 32 bits long, represented in decimal.

4.An IPv6 address is 128 bits long, represented in hexidecimal.

A.1 and 3 only
B.2 only
C.3 and 4
D.2 and 4

Answer: C

Correct answer: 3 and 4

Statements 3 and 4 are correct: IPv4 is 32 bits written as four decimal octets, and IPv6 is 128 bits written as eight groups of four hexadecimal digits. Statement 1 gives IPv6 the length of IPv4, and statement 2 gives it the wrong notation. The move from 32 to 128 bits is a factor of \( 2^{96} \) in address space, not four.

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Which of the following is true when describing a multicast address?

A.Packets addressed to a unicast address are delivered to a single interface.
B.Packets are delivered to all interfaces identified by the address. This is also called a one-to-many address.
C.Identifies multiple interfaces and is only delivered to one address. This address can also be called one-to-one-of-many.
D.These addresses are meant for nonrouting purposes, but they are almost globally unique so it is unlikely they will have an address overlap.

Answer: B

Packets addressed to a multicast address are delivered to all interfaces identified by the multicast address, the same as in IPv4. It is also called a one-to-many address. You can always tell a multicast address in IPv6 because multicast addresses always start with FF.

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Which of the following is true when describing a unicast address?

A.Packets addressed to a unicast address are delivered to a single interface.
B.These are your typical publicly routable addresses, just like a regular publicly routable address in IPv4.
C.These are like private addresses in IPv4 in that they are not meant to be routed.
D.These addresses are meant for nonrouting purposes, but they are almost globally unique so it is unlikely they will have an address overlap.

Answer: A

Correct answer: Packets addressed to a unicast address are delivered to a single interface.

Unicast is the general category, defined by its delivery behaviour: one address, one interface, one recipient. The other three options describe particular *kinds* of unicast address - global, link-local and unique local - so they answer the later questions in this topic rather than this one.

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10.

Which of the following is true when describing a global unicast address?

A.Packets addressed to a unicast address are delivered to a single interface.
B.These are your typical publicly routable addresses, just like a regular publicly routable address in IPv4.
C.These are like private addresses in IPv4 in that they are not meant to be routed.
D.These addresses are meant for nonrouting purposes, but they are almost globally unique so it is unlikely they will have an address overlap.

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.

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