Question: Problem 4 . LAN Addressing ( 20 pt.) Consider the following three LANs interconnected by 2 routers. The table shows assigned IP addresses for hosts

Problem 4. LAN Addressing (20 pt.)

Consider the following three LANs interconnected by 2 routers. The table shows assigned IP addresses for hosts and routers in the network.

Problem 4. LAN Addressing (20 pt.) Consider the following three LANs interconnected

Interface	IP address	MAC address
A	129.128.0.100	AA-12-34-56-78-90
B	129.128.0.101	BB-12-34-56-78-90
C	129.128.1.100	CC-12-34-56-78-90
D	129.128.1.101	DD-12-34-56-78-90
E	129.128.2.100	EE-12-34-56-78-90
F	129.128.2.101	FF-12-34-56-78-90
Router 1 left	129.128.0.1	11-00-00-00-00-01
Router 1 right	129.128.1.1	11-00-00-00-00-02
Router 2 left	129.128.1.2	12-00-00-00-00-01
Router 2 right	129.128.2.1	12-00-00-00-00-02

Suppose Host A sends a datagram to Host E.

a. Give the source and destination MAC addresses in the frame encapsulating this IP datagram as the frame is transmitted from A to the left router. Also give the source and destination IP addresses in the IP datagram encapsulated within the frame.

b. Now give the source and destination MAC addresses in the frame encapsulating this IP datagram as the frame is transmitted from the left router to the right router. Also give the source and destination IP addresses in the IP datagram encapsulated within the frame.

c. Repeat the same thing as above a and b for the frame from the right router to E.

d. Now suppose that the two routers in the figure are replaced by switches. What are the source and the destination MAC addresses and the source and destination IP addresses in the packet transmitted from A (to E)

LAN Router 1 LAN Router 2 LAN

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