IPV6

Question 1

How long is an IPv6 address?

Answer 1

128 bits

Method | Purpose |
| ———- | ———————— |
| Dual-stack | Run IPv4 & IPv6 together |
| Tunneling | Send IPv6 over IPv4 |
| NAT64 | Translate IPv6 ↔ IPv4 |

Question 2

How many hexadecimal characters are in an IPv6 address?

Answer 2

32 hexadecimal characters

Question 3

How many groups (hextets) are in an IPv6 address?

Answer 3

8 groups

Question 4

What is the default IPv6 subnet size used in most networks?

Answer 4

/64

Question 5

How many bits does each IPv6 hextet represent?

Answer 5

16 bits

Question 6

Which IPv6 address type replaces IPv4 private addresses?

Answer 6

Unique Local Address (ULA)

Question 7

What is the IPv6 ULA address range?

Answer 7

FC00::/7 (commonly FD00::/8)

Question 8

Which IPv6 address type starts with FE80::/10?

Answer 8

Link-local

Question 9

What is the purpose of a link-local IPv6 address?

Answer 9

Local network communication only

Question 10

Which IPv6 address type is globally routable?

Answer 10

Global Unicast

Question 11

What is the IPv6 loopback address?

Answer 11

::1

Question 12

What does :: mean in an IPv6 address?

Answer 12

One or more groups of all zeros

Question 13

What is the unspecified IPv6 address?

Answer 13

::

Question 14

Does IPv6 support broadcast?

Answer 14

No

Question 15

Which IPv6 address type replaces broadcast?

Answer 15

Multicast

Question 16

Which IPv6 address type sends traffic to the nearest device?

Answer 16

Anycast

Question 17

What protocol replaces ARP in IPv6?

Answer 17

Neighbor Discovery Protocol (NDP)

Question 18

Which ICMPv6 message resolves MAC addresses?

Answer 18

Neighbor Solicitation

Question 19

What does SLAAC stand for?

Answer 19

Stateless Address Autoconfiguration

Question 20

What is the purpose of SLAAC?

Answer 20

Automatically configure IPv6 addresses without DHCP

Question 21

Does IPv6 require DHCP?

Answer 21

No

Question 22

Which DHCPv6 mode provides configuration info only?

Answer 22

Stateless DHCPv6

Question 23

Which DHCPv6 mode assigns full IPv6 addresses?

Answer 23

Stateful DHCPv6

Question 24

Which transition method runs IPv4 and IPv6 together?

🔍 What dual-stack actually does
When dual-stack is enabled:
Devices get both an IPv4 address and an IPv6 address
Applications choose IPv6 first (if available)
Fall back to IPv4 if IPv6 is not supported

Answer 24

Dual stack
🧠 Why dual-stack is used
The main role of dual-stack is to:
Allow a smooth transition from IPv4 to IPv6 without breaking existing networks

✅ Simple definition
Dual-stack means a device, network, or router runs IPv4 and IPv6 at the same time.

Question 25

Which transition method tunnels IPv6 over IPv4?

Answer 25

Tunneling

Question 26

Which transition method translates IPv6 to IPv4?

Answer 26

NAT64

Question 27

Is NAT required in IPv6?

Answer 27

No

Question 28

How many bits are in the IPv6 interface ID?

Answer 28

64 bits

Question 29

Which IPv6 address type is not routable beyond the local link?

Answer 29

Link-local

Question 30

What is the biggest IPv6 exam trap?

Answer 30

Assuming IPv6 works like IPv4

Question 31

Common Exam Traps

Answer 31

⚠️ Common Exam Traps ❌ Dual-stack does NOT translate traffic ✔ Translation = NAT64 ❌ Dual-stack does NOT tunnel traffic ✔ Tunneling = 6to4, ISATAP | Method | Purpose | | ---------- | ------------------------ | | Dual-stack | Run IPv4 & IPv6 together | | Tunneling | Send IPv6 over IPv4 | | NAT64 | Translate IPv6 ↔ IPv4 |