Fundamentals Of Networking Assignment

TASK

This assessment item has 2 questions.

Question 1: Layers [4 Marks]

In the figure below, what layers correspond to numbers 2, 7,10 and 13? Briefly describe (1-2 sentences per layer) the layers' primary functions.

[0.5 marks each for each correct layer name and 0.5 marks each for each correct function description]

Question 2: Subnet Addressing [2+3+3=8 Marks]

A network has 3 subnets - A, B and C. There are 63, 148 and 51 hosts present in the A, B and C subnets respectively. The subnets share the 23 high-order bits of the 26.249.104.0/23 address space.

Your manager has requested you to calculate subnet addresses to each of the subnets with the following goals-

• leave the largest possible contiguous address space available for assignment in case a new subnet were to be added.
• the amount of address space assigned is minimal;

Please answer the following questions showing logic and calculations based on the above criteria:

1. What is the theoretical maximum number of hosts allowed here? [2 Marks]
2. What are the subnet addresses of subnets A, B and C? [3 Marks]
3. What are the broadcast addresses of subnets A, B and C? [3 Marks]

You need to show step by step calculations to receive full marks. Presenting only correct results with minimum work will receive less than 50% marks.

Question 3: Network Address Translation [16 x 0.5 = 8 Marks]

Three computers are connected together in a local network having IP addresses 10.0.1.13, 10.0.1.16 and 10.0.1.22. Between the hosts and the rest of the internet is a NAT-enabled switch/ router. The host with IP address 10.0.1.13 sends an IP datagram destined to host 128.119.180.181. The source port is randomly selected as 3413 and the destination port as 80.

What are the source and destination addresses of the IP datagram as well as the source and destination port numbers for the TCP segment in the datagram at:

1. step one (i.e. after it has been sent from the host but before it reaches the router).
2. step two? (i.e. after it has been transmitted from the router).
3. step three (just before it is received by the router)
4. step four (after it has been transmitted by the router but before it is received by the host).

You may complete the following table and submit it for this task. Each correct entry would attract 0.5 marks (i.e. for all 16 correct answers, one would receive 16 x 0.5= 8 marks)

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