In Section 6.5, one proposed solution that allowed mobile users to maintaintheir IP

Chapter 6, Problem P11

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In Section 6.5, one proposed solution that allowed mobile users to maintaintheir IP addresses as they moved among foreign networks was to have a foreignnetwork advertise a highly specific route to the mobile user and use theexisting routing infrastructure to propagate this information throughout the network. We identified scalability as one concern. Suppose that when amobile user moves from one network to another, the new foreign networkadvertises a specific route to the mobile user, and the old foreign networkwithdraws its route. Consider how routing information propagates in adistance-vector algorithm (particularly for the case of interdomain routingamong networks that span the globe).a. Will other routers be able to route datagrams immediately to the new foreignnetwork as soon as the foreign network begins advertising its route?b. Is it possible for different routers to believe that different foreign networkscontain the mobile user?c. Discuss the timescale over which other routers in the network will eventuallylearn the path to the mobile users.

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