What is ip-in-ip encapsulation, PHP Web Programming

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Question:

Mobile IP was intended to work with legacy applications and correspondent nodes. However, some advantages may be gained if correspondent nodes are aware of mobility in certain ways.

a) Give three reasons why Mobile IP is preferred to other solutions, concerning mobility support.

b) If a correspondent node CN, is able to do IP-in-IP decapsulation, it may be able to communicate more efficiently with the mobile node despite the presence of ingress filtering. Why?

c) If a correspondent node CN, is able to do IP-in-IP encapsulation, it may be able to communicate more efficiently with the mobile node than is possible with standard Mobile IP. Why?

d) If a correspondent node CN, is able, someplace beneath the application level, to maintain a mapping between a mobile node's local IP address and its home IP address, and receive updates to that mapping from the mobile node, it may be able to communicate more efficiently with the mobile node than is possible with standard Mobile IP. Why?


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