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

Assignment 1
• This is an individual assignment
• Submit your assignment through Moodle
• Submit your packet tracer files
• Submit a word or pdf file contain all your answer
• Do not zip files
• Show your work wherever possible

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
a) How many collision domains and broadcast domains are there in each topology?
b) 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
a) Taking into account of possible expansion of laboratory facilities in the future, we have to pack the subnet so that they use minimal IP address space. With in mind, please assign IP address to the PCs and router Ethernet interfaces (gateways) using the table bellow:
Device IP Gateway Broadcast IP Subnet IP
PC_A1
PC_A2
PC_B1
PC_B2
PC_C1
PC_C2
PC_D1
PC_D2
PC_E1
PC_E2
PC_F1
PC_F2

b) Implement the network using packet Tracker subject to the following conditions:
a. Using on Cisco 2811 router with added Ethernet interfaces
b. Use one Cisco 2962 24 port switch for each laboratory assuming other access switches can be added later on
c. The router Ethernet interfaces use the first host IP address of the corresponding subnet assigned to the laboratory
d. The two PCs shown in the topology should have the second available host IP address and the last available address of the subnet assigned
c) When
d)
e) a TCP/IP packet travels from PC_A1 to PC_F1, we can capture the packet on their way using simulation mode. Use a packet tracer screen capture of the packets to explain where inside a packet/frame you can find:
a. Source MAC address and destination MAC address
b. Source IP address and destination IP address.

********************************* End of the assignment ****************

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