LSNDI RMRA

Worksheet 01 VLSM practice

This work is not required for grading, however it is ESSENTIAL that you are able to work with VLSM to provide network numbering for given designs.

Estimated time: 90 min.

Objectives:

This lab will focus on your ability to accomplish the following tasks:

Draw LAN configurations

Assign classless subnetting to fit appropriate design requirements

Background:

This worksheet will help you become familiar with VLSM and its advantages over classful subnetting. You will also be able to determine the advantages of using VLSM. Knowing how to use VLSM is vitally important to your success in the computer networking industry.

Tools / Preparation:

Pen, paper, calculator

Exercise 1

Use your knowledge of VLSM to design a network numbering scheme for the network shown below.
Use the techniques that you have been shown in the practical sessions for this course.
Remember to begin with the largest group of hosts (or users) first and work your way down to the lowest.
This will be the serial links between the routers.
You have been given the IP address 195.6.7.0 /24
Provide your response to this type of question in a grid such as that given below.

Area	Network Number	Subnet Mask	Broadcast Number	Host Range
Bristol office
Paris office
Bristol - Paris Link

Fill in your responses in your log book

Exercise 2

Now design a network numbering scheme for the network shown below.
Remember to use a table to display your results similar to the table above.
Can you achieve this with the single address 200.200.22.0 /24 ?

Fill in your responses in your log book

Exercise 3 - Comparing classful subnetting with VLSM

Non - VLSM Networking Task (classful subnetting)

This will demonstrate the waste of network addresses that occurs when you do NOT use VLSM. 
Use your knowledge of  subnetting to work out a network numbering scheme for the network shown below. 
Do not use VLSM for the first part of this question. 
Remember that each of the sections of the network must be in its own subnetwork.
Choose your own network address(es).
Each class C address that you subnet will require the same subnet mask throughout.

What is the smallest number of class C addresses that must be used to satisfy this network design?
Remember that the 0th and last subnetwork may not be used, nor may the first and last address for each subnetwork.
Be careful not to use broadcast or network numbers for any of the hosts or interfaces!

VLSM Networking Task

Now use VLSM to provide a network numbering scheme for the same network shown below.
Use a single class C address to allocate addresses to the hosts and the serial links.
Your answer must show the particular subnet masks that you will need to use for each of the interfaces and host ranges.
Be careful not to use broadcast or network numbers for any of the hosts or interfaces!

Now that you have completed this exercise, reflect upon the wastage of IP addresses for the first solution.
What proportion of addresses were wasted when you did not use VLSM?
What proportion of addresses were wasted when you did use VLSM?

Fill in your responses in your log book

IMPORTANT

When you have completed this work, show it to your instructor/ demonstrator who will be able to check it for correctness.