Introduction to IPv6 for AFCAT 2020

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Complete Video at – Introduction to IPv6: Addressing Modes & Format of IPV6(Computer Science)


  • Introduction to IPv6

  • Address Format

  • Addressing Modes

  • Unicast Addressing Mode

  • Multicast Addressing Mode

  • Anycast Addressing Mode

Complete notes and preparation module at

Introduction to IPv6

  • As IPv4 address space was limited , so IPv6 was developed to solve this problem of address space exhaustion.

  • IPv6 (Internet Protocol version 6 ) is the latest version of Internet protocol.

  • It was developed by Internet Engineering Task Force(IETF).

  • It was developed mainly to deal with the problem of IPv4 exhaustion.

Address Format of IPV6

  • IPv6 address is of 128 bits, which is divided into 8 groups.

  • Each group consists of 16 bits and separated by colon(:) .

  • Each group is represented by 4 bit hexadecimal number.

  • Example :

IP6 Address

IP6 Address

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Address Format of IPV6 Contd

The Ipv6 Address is Divided into Two Parts

Image of Ipv6 address is divided into two parts

Image of Ipv6 Address is Divided into Two Parts

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The Network Component is Further Divided As

image of Address Format of IPV6

Image of Address Format of IPV6

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Addressing Modes

  • IPv6 supports 3 types of addressing modes:

    • Unicast addressing mode

    • Multicast addressing mode

    • Anycast addressing mode

Unicast Addressing Mode

  • In this,IPv6 host is uniquely identified in network segment.

  • When router receives unicast IP packet , it sends out to interface that is connected to that particular host

Image of Unicast Addressing Mode

Image of Unicast Addressing Mode

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Multicast Addressing Mode

  • In this, all the hosts which are interested in multicast information are joined to multicast group first .

  • Multicast packet is received by all the hosts which are joined by multicast group.

Image of Multicast Addressing Mode

Image of Multicast Addressing Mode

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Anycast Addressing Mode

  • It’s a new addressing mode introduced by IPv6.

  • In this , multiple hosts are assigned same anycast IP addresses.

  • When a host wants to communicate to host with anycast IP address, it sends unicast message.

  • The unicast message is delivered to host closest to the sender.

Image of Anycast Addressing Mode

Image of Anycast Addressing Mode

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Q1. IPv6 does not use _________ type of address.


A. Unicast

B. Broadcast

C. Multicast

D. None of the above

Answer: B

Q2. The size of IP address in IPv6 is:


A. 4 bytes

B. 128 bytes

C. 8 bytes

D. 100 bytes

Answer: B

  • We learnt about:

# Introduction IPv6

# Address Format

#Addressing Modes

#Unicast Mode

#Multicast Mode

# Anycast Mode