Unicast

Question 1

General definition

Answer 1

• One to one address

- Source

Question 2

Global unicast

Answer 2

Starts with 2 or 3 - 2000::/3

• Globally routable
• Uniquely identifies an interface on the internet

3 bit : Prefix 001 (2000-3fff)
45 bit : Global routing prefix (assigned by IANA to locations)
16 bit : subnet
64 bit : interface (win random, lin mac or custom)

Question 3

Unique local

Answer 3

Starts with fc00::/7 (fc00 - fdff)

• Because the only legitimate value for the L flag is 1, the only valid ULA addresses today are in the fd00::/8 prefix
• non routable globally
• ULA addresses are for devices that never need access to the Internet and never need to be accessible from the Internet.
• no NAT

Question 4

Link-local

Answer 4

Starts with - fe80::/10 (fe80-febf)

• Used to communicate with neighboring nodes (same local link)
• only needs to be unique within a link
• Is always assigned (dynamically or manually)
• Routers do not forward packets with a link-local address
• only one link-local address per interface
• %11 and %en1 following the IPv6 link-local addresses are known as zone identifiers, and they are used to identify the interface on the device.

10 bit : prefix fe80
54 bit : zeros
64 bit : interface (win random, lin mac or custom)

Question 5

Special addresses

Answer 5

Unspecified - :: - used only as a source
Loopback - ::1 - not assigned to any physical interface. One example where an unspecified address can be used is as a source address in ICMPv6 Duplicate Address Detection (DAD).

Question 6

Compatibility

Answer 6

For interaction with IPv4

IPv4 Embedded ::ffff:192.168.10.10