IPv6

Question 1

What is IPv6?

Answer 1

IPv6 (Internet Protocol version 6) is the most recent version of the Internet Protocol, designed to replace IPv4 with a larger address space and improved features.

Question 2

How long is an IPv6 address?

Answer 2

An IPv6 address is 128 bits long, written as eight groups of four hexadecimal digits.

Question 3

What is the main difference between IPv4 and IPv6?

Answer 3

The main difference is the size of the address space—IPv6 has 128-bit addresses, while IPv4 uses 32-bit addresses.

Question 4

What is the “::” notation used for in IPv6?

Answer 4

The “::” notation is used to represent consecutive groups of zeroes in an IPv6 address, simplifying its representation.

Question 5

What is an example of a global unicast address in IPv6?

Answer 5

An example of a global unicast address is 2001:0db8:85a3:0000:0000:8a2e:0370:7334.

Question 6

What is the IPv6 link-local address range?

Answer 6

The IPv6 link-local address range is fe80::/10, used for communication within the same network segment.

Question 7

How does IPv6 handle address autoconfiguration?

Answer 7

IPv6 supports stateless address autoconfiguration (SLAAC), where devices automatically generate their own address based on the network prefix.

Question 8

What is the purpose of IPv6’s Flow Label field?

Answer 8

The Flow Label field is used to identify and prioritize packets belonging to the same flow, providing improved quality of service (QoS).

Question 9

What is the size of the IPv6 header?

Answer 9

The IPv6 header is 40 bytes, which is simpler and more efficient than the IPv4 header.

Question 10

What is the purpose of the IPv6 “Neighbor Discovery Protocol” (NDP)?

Answer 10

NDP is used for discovering devices on the same local network, determining their link-layer addresses, and performing address autoconfiguration.

Question 11

What is the purpose of IPv6 subnetting?

Answer 11

IPv6 subnetting is used to divide a large address space into smaller, more manageable subnets for efficient network design.

Question 12

How do you determine the subnet size in IPv6?

Answer 12

The subnet size is determined by the prefix length (e.g., /64), which indicates how many bits are used for the network portion of the address.

Question 13

What is the standard IPv6 subnet size for most networks?

Answer 13

The standard IPv6 subnet size for most networks is /64, providing a large address space for each subnet.

Question 14

How many subnets can be created from a /48 IPv6 address?

Answer 14

A /48 prefix can create 65,536 subnets, each with a /64 prefix.

Question 15

What is the purpose of the IPv6 prefix length?

Answer 15

The prefix length indicates how many bits in the IPv6 address are dedicated to the network portion, determining the size of the subnet.

Question 16

What is the significance of the /64 subnet in IPv6?

Answer 16

The /64 subnet is the recommended size for most IPv6 networks, allowing for proper address autoconfiguration and efficient operation of various IPv6 features.

Question 17

How do you calculate the number of available IPv6 addresses in a subnet?

Answer 17

The number of available addresses in a subnet is calculated as 2^(128 - prefix length). For example, a /64 subnet has 2^64 addresses.

Question 18

What is the IPv6 address block used for multicast addresses?

Answer 18

The IPv6 multicast address block is ff00::/8.

Question 19

How are IPv6 subnet boundaries typically aligned?

Answer 19

IPv6 subnet boundaries are typically aligned on 4-bit boundaries (e.g., /64, /128).

Question 20

What is an example of an IPv6 subnet with a /48 prefix?

Answer 20

An example of an IPv6 subnet with a /48 prefix is 2001:0db8:abcd:0000::/48.