13. Introducing Basic IPv6

Question 1

The number of bits in an IPv6 address.

Answer 1

128 bits

Question 2

List four IPv4 address exhaustion workarounds

Answer 2

1. Classless interdomain routing (CIDR)
2. Variable-length subnet masking (VLSM)
3. Network Address Translation (NAT)
4. Private IPv4 address space.

Question 3

Abbreviate the following IPv6 address:

2001:0db8:010f:0001:0000:0000:0000:0acd

Answer 3

2001:db8:10f:1::acd

Question 4

Define Multihoming

Answer 4

With IPv6, a host can have multiple IP addresses over one physical upstream link.

Question 5

What is the range of IPv6 Global Unicast addresses?

Answer 5

2000::/3

Question 6

What is the range of IPv6 Link-local addresses?

Answer 6

fe80::/10

Question 7

What is the range of IPv6 Unique-Local addresses?

Answer 7

fc00::/7

Question 8

What is the IPv6 Loopback address?

Answer 8

::1

Question 9

What is the IPv6 “Unspecified” address

Answer 9

:: (all zeros)

Question 10

Which address bits uniquely identify a group ID in an IPv6 multicast address

Answer 10

The last 112 bits.

Question 11

List the eight fields in an IPv6 Header

Answer 11

1. Version
2. Traffic Class
3. Flow Label
4. Payload Length.
5. Next Header
6. Hop Limit
7. Source Address
8. Destination Address

Question 12

What does the Version field in an IPv6 Header do?

Answer 12

This 4-bit field contains the number 6 indicating that the header is an IPv6 header.

Question 13

What does the Traffic Class field in an IPv6 Header do?

Answer 13

The source node uses this field to mark the priority of the outbound packet.

Question 14

What does the Flow Label field in an IPv6 Header do?

Answer 14

This field is used to mark individual traffic flows with unique values. This is to ensure that routers apply an identical Qos to each packet in the same flow.

Question 15

What does the Payload Length field in an IPv6 Header do?

Answer 15

This field describes the length of the payload only. Not the length of the entire packet.

Question 16

What does the Hop Limit field in an IPv6 Header do?

Answer 16

Specifies the maximum number of hops that an IPv6 packet can take.

Question 17

What does the Source Address field in an IPv6 Header do?

Answer 17

This field of 16 octets, or 128 bits, identifies the source of the packet.

Question 18

What does the Destination Address field in an IPv6 Header do?

Answer 18

This field of 16 octets, or 128 bits, identifies the destination of the packet.

Question 19

What is SLAAC?

Answer 19

Stateless Address Autoconfiguration

Question 20

Command to show IPv6 neighbors in Windows

Answer 20

C:\Windows\system32> netsh interface ipv6 show neighbors

Question 21

Which two ICMPv6 types are used for testing IPv6 reachability?

Answer 21

ICMPv6 type 128 and ICMPv6 type 129

Question 22

What is the Solicited-Node Multicast address of a device with an IPv6 address of 2001:db8:1001:f:2c0:10ff:fe17:fc0f

Answer 22

ff02::1:FF17:fc0f

Question 23

Cisco Command to assign a static IPv6 address using EUI-64

Answer 23

Router (config-if)# ipv6 address [ipv6-prefix/prefix-length] [eui-64]

Example

Router (config-if)# ipv6 address 2001:0db8:0:1::/64 eui-64

Question 24

Which command verifies end-to-end transport layer connectivity for HTTP from a PC over an IPv6 path?

Answer 24

telnet [IPv6 address} 80

Question 25

What is the global configuration command to enable IPv6 routing on routers?

Answer 25

ipv6 unicast-routing

Question 26

What is the range for IPv6 multicast addresses?

Answer 26

ff00::/8

Question 27

Translate the following MAC address into the last half of the IPv6 address using EUI-64:
00a1-6789-abcd

Answer 27

02a1:64ff:fe89:abcd

Question 28

What does the “Next Header” field in an IPv6 header do?

Answer 28

This value determines the type of information that follows the basic IPv6 header.

Question 29

What is the Solicited-Node Multicast MAC address of a device with an IPv6 address of 2001:db8:1001:f:2c0:10ff:fe17:fc0f

Answer 29

33:33:FF:17:FC:0F