a) What is the handover function that a network provides? Handover can be performed in the case of a device moving within 1 network provider or the device can move among multiple provider networks. b) Describe one approach of handover in which there is a strong notion of a home network, in which a mobile device has a permanent IP address, and foreign networks, where the mobile device will be allocated a care-of-address.
A mobile device is one that changes its point of attachment into the network over time. From a network perspective, a device is mobile when it changes its access network while maintaining its network connections.
Handover can be performed in the case of a device moving within 1 network provider or the device can move among multiple provider networks.
One approach that might be used in a mobile network architecture that would allow a datagram sent by the correspondent to reach a destination mobile device is to allow mobile users to maintain their IP addresses as they moved among foreign networks. The foreign network would advertise a highly specific route to the mobile user and use the existingrouting infrastructure to propagate this information throughout the network. Scalability is a concern in this approach.
Suppose as the mobile user moves from one network to another, the old foreign network withdraws its route as the new foreign network advertises the specific route to the mobile user. Take into consideration how routing information propagates in a distance-
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