Interactive end-of-chapter exercises


Supplement to Computer Networking: A Top Down Approach 8th Edition


"Tell me and I forget. Show me and I remember. Involve me and I understand." Chinese proverb

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Link Layer (and network layer) addressing and forwarding

Consider the figure below. The IP and MAC addresses are shown for nodes A, B, C and D, as well as for the router's interfaces.


Consider an IP datagram being sent from node C to node D.



Question List


1. What is the source mac address at point 6?

2. What is the destination mac address at point 6?

3. What is the source IP address at point 6?

4. What is the destination IP address at point 6?

5. Do the source and destinaton mac addresses change at point 5? Answer with yes or no.




Solution


1. The source mac address at point 6 is D9-E6-DC-20-FE-B1

2. The destination mac address at point 6 is F8-77-7F-1D-89-50

3. The source IP address at point 6 is 128.119.100.82

4. The destination IP address at point 6 is 128.119.100.182

5. No, datagrams can be sent across the subnet via the link layer in one go.



That's incorrect

That's correct

The answer was: D9-E6-DC-20-FE-B1

Question 1 of 5

The answer was: F8-77-7F-1D-89-50

Question 2 of 5

The answer was: 128.119.100.82

Question 3 of 5

The answer was: 128.119.100.182

Question 4 of 5

The answer was: No

Question 5 of 5

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