Lab - Subnetting Calculations Lab

STUDENT NAME:

In this lab you will subnet a Class A, B, and C network address.

Exercise 1
Scenario:

Your company has one Class B address; 150.210.0.0
The company has been experiencing recent growth and expects to have 7 more locations (they currently have one location), within the next 3 months.

·  How many subnets are required for this configuration?

·  What is the subnet mask for all hosts on all subnets?

·  What are the subnet IDs for all subnets?

·  What are the valid addresses for each subnet?

·  How many hosts can each subnet host at maximum?

Step 1 – Determining the # of subnets and the subnet mask

A unique network id is required to each physical network. If you must take WAN links into consideration on your network, you also require a unique id for the WAN connection.

Calculate the number of subnets required for this scenario, and from the chart, determine the subnet mask.

Number of Subnets:
Subnet Mask: / 255.255.

Step 2 – Calculating the subnet id’s for each subnet

To calculate the subnet id’s for each subnet, use the initial network address and add the Increment value to the first host octet, until you reach the subnet mask. Fill in the left side of the following chart.

Increment Value:
150 / 210 / 0 / 0 / from / 150 / 210
to / 150 / 210
150 / 210 / from / 150 / 210
to / 150 / 210
150 / 210 / from / 150 / 210
to / 150 / 210
150 / 210 / from / 150 / 210
to / 150 / 210
150 / 210 / from / 150 / 210
to / 150 / 210
150 / 210 / from / 150 / 210
to / 150 / 210
150 / 210 / from / 150 / 210
to / 150 / 210
150 / 210 / from / 150 / 210
to / 150 / 210
150 / 210 / from / 150 / 210
to / 150 / 210
150 / 210 / from / 150 / 210
to / 150 / 210
150 / 210 / from / 150 / 210
to / 150 / 210
150 / 210 / from / 150 / 210
to / 150 / 210
150 / 210 / from / 150 / 210
to / 150 / 210
150 / 210 / from / 150 / 210
to / 150 / 210
150 / 210 / from / 150 / 210
to / 150 / 210
150 / 210 / from / 150 / 210
to / 150 / 210

We do not use the first subnet (according to Microsoft – even though it is used in the real world) and we do not use the subnet id with the subnet mask in it either. You cannot have a subnet id equal to your subnet mask. Therefore we must cross out the first subnet id and the last subnet id.

Step 3 – Calculating valid IP addresses for each subnet

Addresses for each subnet are calculated by beginning with an address that is one after the subnet id, to one before the next subnet id. Fill in the right hand side of the chart above.

Step 4 – Determine the number of hosts each subnet can support

Use the formula 2n – 2 where n= the number of host bits remaining. Remember to include host bits from all octets. If 8 bits were used subnetting a Class B address, there would be 8 host bits remaining. Therefore, using the formula above:

28 – 2
= 256 –2
=254 hosts per subnet

Use the formula to determine the number of hosts supported on each subnet of the network in this exercise.

# host bits used:
# host bits remaining:
# hosts per subnet:

Use the calculator in scientific mode to complete the calculation.
(Start >Programs >Accessories >Calculator. View pulldown menu, select Scientific.)


Exercise 2

Scenario:

Your company has one Class A address; 24.0.0.0.
The company has been experiencing recent growth and expects to have 100 locations, each with 70000 personnel within the next 3 months.

·  How many subnets are required for this configuration?

·  What is the subnet mask for all hosts on all subnets?

·  What are the subnet id’s for all subnets?

·  What are the valid addresses for each subnet?

·  How many hosts can each subnet host at maximum?

Step 1 – Determining the # of subnets and the subnet mask

A unique network id is required to each physical network. If you must take WAN links into consideration on your network, you also require a unique id for the WAN connection.

Calculate the number of subnets required for this scenario, and from the chart, determine the subnet mask.

Number of Subnets:
Subnet Mask: / 255.

Step 2 – Calculating the subnet id’s for each subnet

To calculate the subnet id’s for each subnet, use the initial network address and add the Increment value to the first host octet, until you reach the subnet mask. Fill in the left side of the following chart.

Increment Value:
24 / 0 / 0 / 0 / from / 24
to / 24
24 / from / 24
to / 24
24 / from / 24
to / 24
24 / from / 24
to / 24
24 / from / 24
to / 24
24 / from / 24
to / 24
24 / from / 24
to / 24
24 / from / 24
to / 24
24 / from / 24
to / 24
24 / from / 24
to / 24

Skip to end….

24 / from / 24
to / 24
24 / from / 24
to / 24

We do not use the first subnet (according to Microsoft – even though it is used in the real world) and we do not use the subnet id with the subnet mask in it either. You cannot have a subnet id equal to your subnet mask. Therefore we must cross out the first subnet id and the last subnet id.

Step 3 – Calculating valid IP addresses for each subnet

Addresses for each subnet are calculated by beginning with an address that is one after the subnet id, to one before the next subnet id. Fill in the right hand side of the chart above.

Step 4 – Determine the number of hosts each subnet can support

Use the formula 2n – 2 where n= the number of host bits remaining. Remember to include host bits from all octets. If 8 bits were used subnetting a Class B address, there would be 8 host bits remaining. Therefore, using the formula above:

28 – 2
= 256 –2
=254 hosts per subnet

Use the formula to determine the number of hosts supported on each subnet of the network in this exercise.

# host bits used:
# host bits remaining:
# hosts per subnet:

Use the calculator in scientific mode to complete the calculation.
(Start >Programs >Accessories >Calculator. View pulldown menu, select Scientific.)

Exercise 3

Scenario:

Your company has one Class C address; 200.156.109.0.

Recently the company has been experiencing extremely heavy network traffic. As the network administrator, you decide to subnet the LAN into two physical networks. There will 55 hosts on each network.

·  How many subnets are required for this configuration?

·  What is the subnet mask for all hosts on all subnets?

·  What are the subnet ID’s for all subnets?

·  What are the valid addresses for each subnet?

·  How many hosts can each subnet host at maximum?

Step 1 – Determining the # of subnets and the subnet mask

A unique network id is required to each physical network. If you must take WAN links into consideration on your network, you also require a unique id for the WAN connection.

Calculate the number of subnets required for this scenario, and from the chart, determine the subnet mask.

Number of Subnets:
Subnet Mask: / 255.255.255.

Step 2 – Calculating the subnet id’s for each subnet

To calculate the subnet id’s for each subnet, use the initial network address and add the Increment value to the first host octet, until you reach the subnet mask. Fill in the left side of the following chart.

Increment Value:
200 / 156 / 109 / 0 / from / 200 / 156 / 109
to / 200 / 156 / 109
200 / 156 / 109 / from / 200 / 156 / 109
to / 200 / 156 / 109
200 / 156 / 109 / from / 200 / 156 / 109
to / 200 / 156 / 109
200 / 156 / 109 / From / 200 / 156 / 109
to / 200 / 156 / 109

We do not use the first subnet (according to Microsoft – even though it is used in the real world) and we do not use the subnet id with the subnet mask in it either. You cannot have a subnet id equal to your subnet mask. Therefore we must cross out the first subnet id and the last subnet id.

Step 3 – Calculating valid IP addresses for each subnet

Addresses for each subnet are calculated by beginning with an address that is one after the subnet id, to one before the next subnet id. Fill in the right hand side of the chart above.

Step 4 – Determine the number of hosts each subnet can support

Use the formula 2n – 2 where n= the number of host bits remaining. Remember to include host bits from all octets. If 8 bits were used subnetting a Class B address, there would be 8 host bits remaining. Therefore, using the formula above:

28 – 2
= 256 –2
=254 hosts per subnet

Use the formula to determine the number of hosts supported on each subnet of the network in this exercise.

# host bits used:
# host bits remaining:
# hosts per subnet:

Use the calculator in scientific mode to complete the calculation.
(Start >Programs >Accessories >Calculator. View pulldown menu, select Scientific.)


Exercise 4

Network Address: 200.0.0.0

Subnet Mask: 255.255.255.0

Number of subnets required: 6

·  What is the new subnet mask?

·  What is the increment?

·  Write down all subnets, starting from the first valid IP address in each subnet and the last IP address in each subnet.

SUBNET ID START ( From) END ( To)

·  How many IPs are per subnet?

Exercise 5

·  Network Address: 164.2.0.0 Subnet Mask: 255.255.0.0

·  Number of hosts ( IPs) required per subnet: 4000

·  What is the new subnet mask?

·  What is the increment?

·  Write down subnets, starting from the first valid IP address in each subnet and the last IP address in each subnet.

·  SUBNET ID START ( From) END ( To)

·  How many subnets are there?


Exercise 6

Circle the network address of each IP address on this page, after comparing it, to its subnet mask, and write down what class is each IP address?

Network Address / Mask / Class
108.255.254.23 / 255.0.0.0
167.158.101.52 / 255.248.0.0
124.32.129.93 / 255.248.0.0
139.158.111.5 / 255.255.0.0
142.12.157.49 / 255.255.0.0
189.245.90.12 / 255.255.0.0
170.158.192.5 / 255.255.224.0
123.213.128.93 / 255.255.224.0
120.47.159.28 / 255.255.224.0
142.192.160.49 / 255.255.240.0
146.125.224.25 / 255.255.240.0
183.18.16.121 / 255.255.248.0
179.254.60.88 / 255.255.248.0
210.216.10.66 / 255.255.255.0
200.160.22.190 / 255.255.255.0
199.176.32.220 / 255.255.255.0
220.99.100.64 / 255.255.255.192
190.33.68.128 / 255.255.255.192
207.119.33.96 / 255.255.255.240
195.18.33.200 / 255.255.255.248

Write down the network address and the broadcast address for each IP address below

IP Address / Mask / Network Address / Broadcast Address
123.213.129.93 / 255.248.0.0
124.23.129.93 / 255.248.0.0
170.158.111.5 / 255.255.224.0
167.158.101.5 / 255.255.224.0
190.33.68.87 / 255.255.224.0
179.254.60.88 / 255.255.224.0
120.4.159.28 / 255.255.224.0
139.158.111.5 / 255.255.240.0
46.125.239.22 / 255.255.240.0
142.12.157.49 / 255.255.248.0
142.192.167.49 / 255.255.248.0
199.19.33.77 / 255.255.255.192
183.18.11.121 / 255.255.255.192
200.2.10.66 / 255.255.255.224
209.26.10.66 / 255.255.255.240
197.19.33.97 / 255.255.255.248


Exercise 7

For each row in the table below determine if the two IP addresses are on the same local network or on a remote network.

Circle your answer Local or Remote (Local means, same subnet. Remote means a different subnet )

IP Address / IP Address / Subnet Mask / LOCAL / REMOTE
197.19.33.90 / 197.19.33.97 / 255.255.255.248 / LOCAL / REMOTE
222.222.10.46 / 222.222.10.66 / 255.255.255.240 / LOCAL / REMOTE
200.2.10.46 / 200.2.10.66 / 255.255.255.224 / LOCAL / REMOTE
192.19.33.90 / 192.19.33.77 / 255.255.255.192 / LOCAL / REMOTE
163.18.11.84 / 163.18.11.121 / 255.255.255.192 / LOCAL / REMOTE
152.12.168.89 / 152.12.157.49 / 255.255.248.0 / LOCAL / REMOTE
142.192.168.89 / 142.192.167.49 / 255.255.248.0 / LOCAL / REMOTE
137.158.96.14 / 137.158.111.5 / 255.255.240.0 / LOCAL / REMOTE
45.125.223.77 / 45.125.239.22 / 255.255.240.0 / LOCAL / REMOTE
10.4.139.49 / 10.4.159.28 / 255.255.224.0 / LOCAL / REMOTE
177.158.96.14 / 177.158.111.5 / 255.255.224.0 / LOCAL / REMOTE
137.158.99.14 / 137.158.101.5 / 255.255.224.0 / LOCAL / REMOTE
190.33.49.78 / 190.33.68.87 / 255.255.224.0 / LOCAL / REMOTE
179.254.36.88 / 179.254.60.88 / 255.255.224.0 / LOCAL / REMOTE
123.216.129.67 / 123.213.129.93 / 255.248.0.0 / LOCAL / REMOTE
124.16.129.67 / 124.23.129.93 / 255.248.0.0 / LOCAL / REMOTE