IPv6

Question 1

Hextet

Answer 1

bit = binary 1 or 0
nibble = 4 bits
Byte = 8 bits
Hextet = 16 bits
- 10101010 01000110
- Hex - 0xAA46

Question 2

IPv4 vs IPv6

Answer 2

IPv4 is 32 bits long, and consists out of 4 octets

11000000 10101000 00001010 00001010

IPv6 128 bits long = 32 nibbles or 8 hextets

2001:0DB8:0002:008D:0000:0000:00A5:52F5

Question 3

Typical network portion on IPv6 address

Answer 3

64 bit network portion and 64 bit host portion

/ 64 mask

Question 4

How can IPv6 be shortened?

Answer 4

By eliminating the leading zero, and replacing successive sets of zeros with a double colon

Question 5

How many potential unique addresses do we have within a 64 bit portion of an IPv6 address

Answer 5

2^64

Question 6

Dual-stack

Answer 6

Runs both IPv4 and IPv6

Question 7

What is unique about IPv6 addressing

Answer 7

Every interface on a network uses two IPv6 addresses, one is the unicast address, the other is the link local address

The link local address only exists on layer two

Question 8

IPv6 Address Acquisition

Answer 8

SLAAC: stateless address auto configuration

1 Router advertisement with 64bit network portion
2. Pc adds a random 64 bit interface identifier to the network portion

on Unix/Linux/Mac uses a modified EUI format for the network interface identifier portion

It takes the mac address and breaks it in half then adds FF:FE in the middle, and then takes the first 8 bits and flip the 7 value of the binary and reconvert it to hexadecimal.

Question 9

DHCP server

Answer 9

DHCP server assigns IPv6 address to devices

Question 10

Tunneling IPv6

Answer 10

Used to access IPv6 networks

Puts IPv6 packet in an IPv4 packet in order to transport it through IPv4 network