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Computer Network
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What are the benefits of using a layered model for computer networks ?

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Question 1 (5 marks)

What are the benefits of using a layered model for computer networks?

Question 2 (10 marks)

There thee network topologies shown below are all valid ethernet network

  1. How many collision domains and broadcast domains are there in each topology?
  2. Explain which topology is preferred

Question 3 (10 marks)

Explain why 60.61.62.63/26 is not a valid host IP address?

question 4 (10 marks)

In the following network topology, assume static routes are set and the routers are working properly. Explain why PC A can talk to PC C but PC B cannot talk to PC D

Question 5 (65 marks)

USQ has allocated 172.17.0.0/16 to 6 PC laboratories in Sarnia Campus. Each laboratory will have a subnet of its own. The number of host in each laboratory is as follows:

The hosts in each laboratory are linked together using switches. The six laboratories are linked together using a router with six Ethernet interfaces as shown below. In the topology, only wo hosts in each laboratory are shown. For each subnet, the gateway will use the first host IP address. The two PCs (for example, PC_B1 and PC_B2) in each subnet shown will be using the second available host IP address and the last available host IP address respectively

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