Question:

a) Describe the triangular delivery and two crossing problem that appears in Mobile IP.

b) Discovery, Registration and Tunneling are three basic capabilities of Mobile IP. Describe them briefly.

c) Mobile IP: Suppose a remote host sends a datagram to a mobile host. Describe the roles of the home agent and foreign agent in the delivery of the datagram?

d) Mobile IP suffers from inefficiency in the data delivery phase. Why?

e) IPsec uses two modes: tunnel mode and transport mode. Outline in which situations the two different forms are preferably used. Also, describe the encapsulation in the two modes.