Question: Consider the following scenario, assuming Mobile IP and IP version 4. A mobile host (MH) has a home address of 71.13.204.20; the address space for

Consider the following scenario, assuming Mobile IP and IP version 4. A mobile host (MH) has a home address of 71.13.204.20; the address space for its home network is 71.13.204.0/24 and the home agent, at the gateway to this network, has address 71.13.204.0. The MH is currently at foreign network 210.4.79.0/4, where the foreign agent has IP address 210.4.79.0 and the MH receives care-of address 210.4.79.18. A remote client, with IP address 56.1.78.22, generates a datagram for the mobile node. The remote client does not use Mobile IP. Suppose the home agent tunnels this datagram to the MH using IP-in-IP encapsulation. Consider the datagram going from the HA to the MH. (a) What is the source address in the inner header of the datagram is . (b) What is the destination address in the inner header of the datagram is . (c) What is the source address in the outer header of the datagram is . (d) What is the destination address in the outer header of the datagram is . Note: Please use IP addresses in dot-decimal notation, and include simply the 4-byte address (no /n notation).

In above question, as the datagram travels from the home agent towards the foreign network, over multiple hops, which of the following fields in the inner IP header may be changed at intermediate routers?

Identification.

Time-to-live.

Checksum.

Offset.

None of these.

In above question, as the datagram travels from the home agent towards the foreign network, over multiple hops, which of the following fields in the outer IP header will change at intermediate routers?

Identification.

Time-to-live.

Checksum.

Time-to-live and checksum.

All of the above.

In above question, which field in the IP header is used by the home agent to indicate that IP-in-IP encapsulation is being adopted? Does it reside in the outer or in the inner IP header?

As a continuation of Question 1, now assume that the MH uses reverse tunneling with IP-in-IP encapsulation to send a datagram back to the remote client. (a) What is the source address field in the inner IP header is . (b) What is the destination address field in the inner IP header is . (c) What is the source address in the outer IP header is . (d) What is the destination address in the outer IP header is . Note: use IP addresses in dot-decimal notation. Include simply the 4-byte address (no /n notation).

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