IPv6 Questions and Answers

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.

Q: What multicast addresses does EIGRPv6 use?

Correct answer: FF02::AEIGRPv6 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.

Q: To enable EIGRP, which of the following would you use? 1.Router1(config-if)# ipv6 ospf 10 area 0.0.0.0 2.Router1(config-if)# ipv6 router rip 1 3.Router1(config)# ipv6 router eigrp 10 4.Router1(config-rtr)# no shutdown 5.Router1(config-if)# ipv6 eigrp 10

Correct answer: 3, 4 and 5EIGRPv6 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.

Q: You want to ping the loopback address of your local host(with IPv6). What will you type?

Correct answer: ping ::1The 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.

11.

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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12.

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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13.

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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14.

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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15.

Which statement(s) about IPv6 addresses are true?

1.Leading zeros are required.

2.Two colons (::) are used to represent successive hexadecimal fields of zeros.

3.Two colons (::) are used to separate fields.

4.A single interface will have multiple IPv6 addresses of different types.

A.1 and 3
B.2 and 4
C.1, 3 and 4
D.All of the above

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.

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16.

What multicast addresses does EIGRPv6 use?

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

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.

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17.

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

1.Router1(config-if)# ipv6 ospf 10 area 0.0.0.0

2.Router1(config-if)# ipv6 router rip 1

3.Router1(config)# ipv6 router eigrp 10

4.Router1(config-rtr)# no shutdown

5.Router1(config-if)# ipv6 eigrp 10

A.1, 3 and 5
B.3, 4 and 5
C.1 and 3
D.5 only

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.

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18.

Which of the following is true when describing a link-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: 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.

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19.

You want to ping the loopback address of your local host(with IPv6). What will you type?

A.ping 127.0.0.1
B.ping 0.0.0.0
C.ping ::1
D.trace 0.0.::1

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.

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