IPv6

Question 1

What is the “address” and mask of an Unspecified IPv6 address?

Answer 1

::/128

Question 2

What is the address and mask of the Local Loopback IPv6 address?

Answer 2

::1/128

Question 3

What is the address range and mask for a Global Unicast IPv6 address?

Answer 3

2000::/3

The range would be any address starting with 2000 through 3FFF

Question 4

What is the address range and mask for a multicast IPv6 address?

Answer 4

FF00::/8

Question 5

What is the address range and mask for a Link-Local IPv6 address?

Answer 5

FE80::/10

Question 6

What is the address range and mask for an IPv6 Unique Local Address (aka private addresses)?

Answer 6

FC00::/7

NOTE: In actual practice, most implementations use “FD” as the leading characters.

Question 7

How is an IPv4 address embedded into an IPv6 address?

Answer 7

The first 96 bits (6 segments) of the IPv6 address are all zeros while the IPv4 address is then converted to Hexadecimal and added to the end.

Question 8

When dealing with IPv6 Link Local addresses, what is “DAD”?

Answer 8

Duplicate Address Detection - When an ethernet interface is trying to determine if any other devices are using the link-local address that the device is trying to generate.

Question 9

When dealing with IPv6 Link Local addresses, what is “NS”?

Answer 9

Neighbor Solicitation - a message is sent by a node to determine the link-layer address of a neighbor, or to verify that a neighbor is still reachable via a cached link-layer address. NS are also used for Duplicate Address Detection.

Question 10

When dealing with IPv6 Link Local addresses, what is “NA”?

Answer 10

Neighbor Advertisement - a message is sent in response to an NS message. A node may also send unsolicited NAs to announce a link-layer address change.

Question 11

When dealing with IPv6 Link Local addresses, what is “RS”?

Answer 11

Router Solicitation - When an interface becomes enabled, hosts may send out RSes that request that routers generate Router Advertisements (RAs) immediately rather than at their next scheduled time.

Question 12

When dealing with IPv6 Link Local addresses, what is “RA”?

Answer 12

Router Advertisements - Routers advertise their presence together with various link and Internet parameters either periodically, or in response to an RS message. RAs contain prefixes that are used for determining whether another address shares the same link (on-link determination) and/or address configuration, a suggested hop limit value, and so forth.

Question 13

What TYPE of messages are NS, NA, RS, and RA in IPv6?

Answer 13

These are all ICMPv6 messages as defined in RFC 4861

Question 14

What is the EUI method?

Answer 14

A method for generating a unique interface ID for an IPv6 address:

1. Split the device’s 48-bit MAC address into two 24-bit parts
2. Insert the 16-bit hexadecimal code “FFFE” between the two parts
3. Invert the 7th bit of the interface ID
4. Add the NIC part of the MAC address