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RMIT Classification: Trusted

Data Communication and Net-centric Computing (COSC1111)

Assignment 1 (20%)

Task 1 (10 marks)

Create a network topology using Packet Tracer version 8.2.2 that consists of five identical PCs, one

printer, one router. Two of the PCs are used as server. Each PC needs to be able to connect to the

Internet and share files with one another. The printer should be accessible by all PCs on the

network.

1. Configure the PCs, router, and printer to achieve this setup. (4 marks)

2. Configure one server hosts a web application using TCP (Transmission Control Protocol) for

communication, while another server hosts a real-time streaming service using UDP (User

Datagram Protocol). (3 marks)

3. Initiate a DNS query by providing a domain name of your preference. The responses are

exchanged over UDP. Monitor the flow of DNS packets at data link layer, network layer,

and transport layer of OSI model, and show the address related information in the header

field. (3 marks)

You are required to:

Provide screenshots of your configuration and step-by-step explanation of configuration

process, including IP addressing, subnetting, and any additional settings required for 1.1

and 1.2, and provide screenshots for address related information of associated layers.

Submit a pka file that includes your configuration process, including IP addressing,

subnetting, and any additional settings required.

Task 2 (10 marks)

The head office of Car Sales occupies a three-story building with IP address 128.119.40.128 and

CIDR prefix /26. Assume each floor uses a subnet, including Subnet 1 for marketing department,

Subnet 2 for admin department and Subnet 3 for technical department, as shown in Figure 1 below.

It has a subnet 4 for branches outside this building.

1. Design a subnet mask that provides the same size 4 subnets. Provide detailed calculation

and fill in the following table. (3 marks)

NetID Subnet Host number

Subnet 1

Subnet 2

Subnet 3

Subnet 4

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RMIT Classification: Trusted

2. Assume that your student ID is assigned by your role (in one of the departments of Car

Sales) and can be identified by individual subnet addresses. Convert your student IDs into

binary by using the mod2 operation. Show the conversion and fill in the following table. (2

marks)

Student ID Converted binary Potential host Department

3. Investigate how data is transferred reliably between two members of your group that work

in two different subnets. You are required to answer each sub-question in less than 200

words. (5 marks).

Show the host-to-host (higher-layer) and hop-to-hop (lower-layer) processing using a

figure (cite reference where needed, you are not encouraged to use figures from DCNC

lecture notes). Give details about which layers the processing is associated with

Discuss the processings inside a router and how a router decides next hop for sending

messages towards the destination.

Explore how the higher-layers and the lower-layers complement each other to achieve

the reliable end-to-end data communication between sender and receiver.

Figure 1 SubNet structure in head office.

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