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Q1 What is mobile IPv6 ?

Ans : Mobile IPv6 (MIPv6 ) is a protocol developed as a subset of Internet protocol version 6 ( IPv6) to support mobile connections. Mipv6 is an update of the IETF ( Internet Engineering Task Force ) Mobile IP standard ( RFC 2002) designed to authenticate mobile devices (known as mobile nodes ) using IPv6 Address.

This allow mobile device to move from one network to another and still maintain existing connections. Although Mobile IPv6 is mainly targeted to mobile device, it is equally applicable for wired environments

Q2 What is the motive of mobile ipv6 ?

Ans : The motive of ipv6 is to deal with the scaling problem due to the vast growth of the internet.

IPv6 has 128_bit address field as opened to the 32 bit of ipv4, address do not have classes. the address space is subdivided in various ways based on the leading bits, the header format of ipv6 is simpler than ipv4 it invites 4 bit version field, 8 bit field for traffic class, 20 bit flow label in the first row of 32 bits there are 16 bit payload length, 8 bit each for next header and ipvx limit that order.

Q3 What is the need of the mobile IPv6 ?

Ans: IPv6 is the next generation internet protocol. IPv4 has some problem so IPv6 is designed to enable high performance, scalable Internet.

Q4 Definition and terms that are used in mobile IPv6 ?

Ans: Home network

The home network of a mobile device is the network within which the device receives its identifying IP address ( home address )

Home Address

the Home address of a mobile device is the IP address assigned to the device within its home network.

Foreign network

A foreign network is the network in which a mobile node is operating when away from its home network.

Care of address.

The care-of address of a mobile device is the network-native IP address if the device when operating in a Foreign network.

Home agent

A home agent is a router on a mobile node’s home network which tunnels datagrams for the delivery to the mobile node when it is away from home. It maintains current location ( IP address ) information for the mobile node. It is used with one or more foreign agents.


A binding is the association of the home address with a care of association.

Q5 what are the Various IPv6 features that are needed by mobile IPv6 ? 

Ans:  Several terms and information are necessary to understand Mobile IPv6 :

A foreign link defines a link that is not the mobile node’s home ink

A care of address denotes an address that is used by the mobile node while it is attached to a foreign link. Whenever a mobile node moves from the home ink to a foreign link, it is always (still) reachable by its home address, regardless of its location in IPv6 network.

Home address signifies that the mobile node is logically connected to the home link. Also, the association of a home address with a care-of address for a mobile node is known as a binding ,Home agent is a router (on the home link ) that maintains registration of mobile nodes that are away from home and their current address .A correspondent node is an IPv6 (not necessarily Mobile IPv6 capable) node that communicates with a mobile node.

Q6 Describe the operation of mobile IPv6 ?

Ans: When a mobile node is away from home , it sends information about its current location to the home agent .A home agent intercepts these packets, using a table, tunnels the packets and using a table, tunnels the packets to the mobile node’s care –of-address.

Mobile IPv6 uses care –of address as source address as source address in Foreign links, Also, to support natural route optimization , the Correspondent node uses IPv6 routing header than the IP encapsulation .The following discussion makes Mobile IPv6 S understanding more clear by highlighting the benefit of Mobile IPv6 over mobile IPv4

Q7 Compare IPv4  to IPv6 ?



  • Address are 32 bits ( 4 bytes )
  • Address resource records in the DNS to map host names to IPv4 address.
  • IPsec is optional and should be supported externally .
  • Broadcast address are used to send traffic to all nodes on a subnet.
  • IPv4 has only stateful configuration.
  • Header includes a checksum.
  • Header includes option.


  • Address are 128 bits (16 bytes) In Length
  • Address resource records in DNS to map host names to IPV address.
  • IPsec support is not optional
  • IPv6 uses a link local scope all nodes multicast address.
  • IPv6 has both types of auto configuration.
  • Header does not include a checksum.
  • IPv6 uses a link local scope all nodes multicast address.

Q8 What are the changes that made in IPcv6 for Mobile IPv6 ?\

Ans :   A set of mobility options to include in mobility messages

A new home Address option for the Destination Options header

A new type 2 Routing header

New Internet Control Message Protocol for IPv6 (ICMPv6) messages to discover the set of home agents and to obtain the prefix of the home link

Changes to router discovery messages and options and additional Neighbour discovery options

Q9 How is mip6 related to mobile ipv6 ?

Ans: Mobile IP6 (MIp6) specifies routing support which permits an IPv6

host to continue using its home address as it moves around the Internet, enabling continuity of sessions, Mobile IPv6 supports transparency above the IP layer, Including maintenance of active transport level sessions. The base specifications for Mobile IPv6

Consist of :

  • RFC 3775
  • RFC 3776

The primary goal of the MIP6 working group will be to enhance base IPv6 mobility by continuing work on deployments. Additionally the working group will ensure that any issue identified by implantation and interoperability experience and addressed, and that the base specifications are maintained. The group will also produce informational documentation,

Such as design rationale documents or description of specific issues

Within the protocol.

Q10 What are the advantages of mobile Ipv6 ?

Ans:  There are many advantages of ipv6 :

  • Larger address space
  • Better header format
  • New option
  • Possibility of extension
  • More security
  • Resource allocation
  • IPv6 Provides more quality of services