hello networking

What are the three main IPv6 migration techniques defined by the IETF?

Dual Stack, Tunneling, and NAT64

What is Dual Stack in IPv6 migration?

It allows IPv4 and IPv6 to coexist on the same network. Devices run both protocol stacks simultaneously.

What does “native IPv6” mean?

The customer network has a direct IPv6 connection to the ISP and can access internet content over IPv6.

What is IPv6 tunneling?

A technique for transporting IPv6 packets over an IPv4 network by encapsulating them inside IPv4 packets.

What does NAT64 do?

It translates IPv6 packets to IPv4 and vice versa so IPv6-enabled devices can communicate with IPv4-only devices.

When should tunneling and translation be used?

Only when necessary for transitioning

the goal is native IPv6 communication end-to-end.

How many bits long is an IPv6 address?

128 bits.

What numbering system is used in IPv6 addresses?

Hexadecimal (base 16) using digits 0–9 and letters A–F.

What is a hextet?

A 16-bit segment (four hexadecimal digits) of an IPv6 address.

What is the preferred IPv6 address format?

Eight hextets separated by colons: x:x:x:x:x:x:x:x

How many hexadecimal digits total are in an IPv6 address?

32 hexadecimal digits.

Are IPv6 addresses case-sensitive?

No

What is Rule 1 for IPv6 compression?

Omit leading zeros in any hextet.

Give an example of omitting leading zeros.

01ab → 1ab

09f0 → 9f0

0a00 → a00

00ab → ab.

Can you omit trailing zeros in IPv6?

No

What is Rule 2 for IPv6 compression?

Use a double colon (::) to replace one contiguous string of all-0 hextets.

How many times can a double colon be used in an IPv6 address?

Only once per address.

Give an example of using a double colon.

2001:db8:cafe:1:0:0:0:1 → 2001:db8:cafe:1::1.

What is the preferred practice when multiple zero strings exist?

Use the double colon on the longest string

if equal

use the first one.

What is the term for writing IPv6 in full without compression?

Preferred format.