2.5 IPv6

Question 1

What is the primary reason IPv6 was developed?

Answer 1

To solve IPv4 address exhaustion.

Question 2

How many bits are in an IPv6 address?

Answer 2

128 bits.

Question 3

Approximately how many unique addresses does IPv6 support?

Answer 3

340 undecillion (3.4 × 10³⁸).

Question 4

How does IPv6 improve network efficiency compared to IPv4?

Answer 4

No broadcast traffic, no fragmentation, and better routing efficiency.

Question 5

What addressing technique allows IPv6 to operate alongside IPv4?

Answer 5

Dual-stack implementation.

Question 6

What method allows IPv6 packets to be transmitted over IPv4 networks?

Answer 6

Tunneling.

Question 7

What notation does IPv6 use?

Answer 7

Hexadecimal with colons (e.g., 2001:db8::1).

Question 8

What are the three types of IPv6 addresses?

Answer 8

Unicast, Multicast, Anycast.

Question 9

What is the prefix for IPv6 Global Unicast addresses?

Answer 9

2000::/3.

Question 10

What is the prefix for IPv6 Link-Local addresses?

Answer 10

FE80::/10.

Question 11

What is the prefix for IPv6 Multicast addresses?

Answer 11

FF00::/8.

Question 12

What type of IPv6 address is used to communicate with multiple hosts at once?

Answer 12

Multicast.

Question 13

What type of IPv6 address is used to communicate with the nearest service instance?

Answer 13

Anycast.

Question 14

What does SLAAC stand for in IPv6?

Answer 14

Stateless Address Auto-Configuration.

Question 15

How does SLAAC help IPv6 devices?

Answer 15

It allows devices to assign themselves an IPv6 address without DHCP.

Question 16

What is EUI-64 in IPv6?

Answer 16

A method that generates an IPv6 host address based on a device’s MAC address.

Question 17

Why is DHCP often unnecessary in IPv6 networks?

Answer 17

SLAAC and Neighbor Discovery Protocol (NDP) provide automatic IP assignment.

Question 18

What protocol replaces ARP in IPv6?

Answer 18

Neighbor Discovery Protocol (NDP).

Question 19

What are two methods used to transition from IPv4 to IPv6?

Answer 19

Dual-stack and tunneling.

Question 20

What is a key advantage of IPv6 over IPv4?

Answer 20

Nearly unlimited address space and built-in security features.

Question 21

What is the shorthand notation for IPv6 addresses?

Answer 21

Removing leading zeros and compressing consecutive zero blocks (e.g., 2001:db8::1).

Question 22

What is the primary purpose of an IPv6 Link-Local address?

Answer 22

To allow devices to communicate within a local network without a router.

Question 23

What is the difference between an IPv6 Unicast and Anycast address?

Answer 23

Unicast is assigned to a single device, while Anycast is assigned to multiple devices but routes to the nearest one.