M4Q21: IPv6

Question 1

An IPv6 address is comprised of how many total hexadecimal digits?

A. 128
B. 64
C. 32
D. 12

Answer 1

C. 32

Explanation: An IPv6 address is represented as eight groups of four hexadecimal digits. Each group represents 16 bits which is sometimes called a hextet. The groups (or hextets) are separated by colons. An example of an IPv6 address is:

2001:0BD8:C003:0001:0000:0000:0000:F00C

Question 2

When an IPv6 address is converted from hexadecimal into binary how many total binary digits are there?

A. 128
B. 64
C. 32
D. 8

Answer 2

A. 128

Explanation: Each group of four hexadecimal digits in an IPv6 address represents 16 bits. There are a total of eight groups each separated by a colon. Eight groups multiplied by 16 bits equals 128 total bits.

Question 3

IPv6 was created to eventually replace IPv4.

A. True
B. False

Answer 3

A. True

Explanation: IPv6 was created to allow for more public IP addresses and easier allocation of IP networks across the globe. IPv6 has the capacity to completely replace IPv6, however it is merely speculation as to how long that would actually take. As long as there are systems that still require IPv4 and have not been migrated to IPv6 then IPv4 will still remain. For the foreseeable future it will be a hybrid IPv4/IPv6 world. However, IPv6 was designed to supplement and eventually replace IPv4.

Question 4

IPv6 uses traditional Broadcast messages just like IPv4 does.

A. True
B. False

Answer 4

B. False

Explanation: Unlike IPv4 IPv6 does not use traditional IP Broadcasts. Instead, IPv6 uses improved Multicasts and a new transmission method called Anycast.

Question 5

What is the default subnet prefix that you would find on an IPv6 address assigned to a workstation/host computer?

A. /32
B. /128
C. /48
D. /64

Answer 5

D. /64

Explanation: The last 64 bits are the unique IPv6 identifier for the host computer. This portion of the IPv6 address is called the Interface ID. A /64 mask means the first 64 bits are used for the Network/subnet and the last 64 bits are used for the host.

Question 6

Identify the proper abbreviation of the IPv6 Loopback address.

A. 2001::127
B. 127:0:0:0:0:0:0:1
C. 127::1
D. ::1

Answer 6

D. ::1

Explanation: The full IPv6 loopback address is:

• 0000:0000:0000:0000:0000:0000:0000:0001*
• …which can be abbreviated as:*
• 0000:0000:0000:0000:0000:0000:0000:1,
• 0:0:0:0:0:0:0:1,
• ::1 (as the shortest abbreviation)

Question 7

Which IPv6 prefix defines a link-local IPv6 address?

A. FE80::/64
B. FC00::/7
C. 2001::/16
D. ::1

Answer 7

A. FE80::/64

Explanation: Link-local IPv6 addresses are automatically generated for the network interface and use a predefined prefix of FE80::/64.