Subnetting Calculation

 

In this section, you are expecting to show the calculation on how to identify the IP address that was assigned for the Ulearn System Server based on the information given in the project scenario. Explain the concept and show the calculation to identify the IP address.

Students are required to suggest private addressing scheme used in UTeM network. Explain how you calculate the subnetting using FLSM based on the number of the faculties. The number of students of each faculty is within 500 – 1000 students. Each faculty is given their network address. Assign IT Center as another subnet with their own network address. From this network address, assigned as the 5th available address as the address of the Ulearn System Server.

FLSM

Number of faculties = 10

Number of students = 500-1000

 

Have 9 subnet (Represents 8 faculties in UTeM + IT Center)

Each subnet have 500-1000 host.

Class B - (128-191) /18 = 14 host bits. Can hold 16,348 host.

Private IP Range - 172.16.0.0 to 172.16.255.255

 

SELECT IP ADDREESS

- 172.24.0.0/18 (CLASS B) address block

                - Host portion = 14 bits

                - Number of IP address supported = 16,384

                - Network diagram

                - 9 subnet with 500-1000 host address

                - Total required address = 10,000 (Assume/Take the largest host for each subnet)

 

Step 1:

- 172.24.0.0

- /18 => 1111 1111.1111 1111.1100 0000.0000 0000 => 255.255.192.0 (Subnet Mask)

 

Step 2: Find highest host address

Assume the largest subnet = 1000 host

 

Step 3: Find number of bit host portion can support highest host address

- 1000 host

- 10 bit

- 2^10 = 1024

Quantity of host = 2^H - 2 ~ 1000

So, 2^H = 2^10 (equal or more than 1000)

H = 10, 2^10 - 2 => 1022

 

Actually borrow 10bits from 14 host portion.

2^4 = 16 (have 16 subnet) only 9 subnets in UTeM

 

=> 1111 1111.1111 1111.1100 0000.0000 0000 (original = /18)

=> 1111 1111.1111 1111.1111 1100.0000 0000 (new) => 255.255.252.0

Borrow 4 bit (2^4 = 16 subnet)

1111 1111.1111 1111.11xx xx00.0000 0000

 

xx xx (9 subnet) = 0000, 0001, 0010, 0011, 0100, 0101, 0110, 0111, 1000, 1001

 

Step 4: Find network for each subnet

SUBNET 0

xx xx = 0000

172.24.00xx xx00.0000 0000 => xx xx = 0000

                Network Address=172.24.0000 0000.0000 0000 => 172.24.0.0

                Broadcast Address=172.24.0000 0011.1111 1111 => 172.24.3.255

                Usable Address= 172.24.0.1 to 172.24.3.254

 

SUBNET 1

xx xx= 0001

172.24.00xx xx00.0000 0000 => xx xx = 0001

                Network Address=172.24.0000 0100.0000 0000 => 172.24.4.0

                Broadcast Address=172.24.0000 0111.1111 1111 => 172.24.7.255

                Usable Address=172.24.4.1 to 172.24.7.254

 

SUBNET 2

xx xx = 0010

172.24.00xx xx00.0000 0000 => xx xx = 0010

                Network Address=172.24.0000 1000.0000 0000 => 172.24.8.0

                Broadcast Address=172.24.0000 1011.1111 1111 => 172.24.11.255

                Usable Address=172.24.8.1 to 172.24.11.254

 

SUBNET 3

xx xx = 0011

172.24.00xx xx00.0000 0000 => 0011

                Network Address=172.24.0000 1100.0000 0000 => 172.24.12.0

                Broadcast Address=172.24.0000 1111.1111 1111 => 172.24.15.255

                Usable Address=172.24.12.1 to 172.24.15.254

 

SUBNET 4

xx xx = 0100

172.24.00xx xx00.0000 0000 => 0100

                Network Address=172.24.0001 0000.0000 0000 => 172.24.16.0

                Broadcast Address=172.24.0001 0011.1111 1111 => 172.24.19.255

                Usable Address=172.24.16.1 to 172.24.19.254

 

SUBNET 5

xx xx = 0101

172.24.00xx xx00.0000 0000 => 0101

                Network Address=172.24.0001 0100.0000 0000 => 172.24.20.0

                Broadcast Address=172.24.0001 0111.1111 1111 => 172.24.23.255

                Usable Address=172.24.20.1 to 172.24.23.254

 

SUBNET 6

xx xx = 0110

172.24.00xx xx00.0000 0000 => 0110

                Network Address=172.24.0001 1000.0000 0000 => 172.24.24.0

                Broadcast Address=172.24.0001 1011.1111 1111 => 172.24.27.255

                Usable Address=172.24.24.1 to 172.24.27.254

 

SUBNET 7

xx xx = 0111

172.24.00xx xx00.0000 0000 => 0111

                Network Address=172.24.0001 1100.0000 0000 => 172.24.28.0

                Broadcast Address=172.24.0001 1111.1111 1111 => 172.24.31.255

                Usable Address=172.24.28.1 to 172.24.31.254

 

SUBNET 8

xx xx = 1000

172.24.00xx xx00.0000 0000 => 1000

                Network Address=172.24.0010 0000.0000 0000 => 172.24.32.0

                Broadcast Address=172.24.0010 0011.1111 1111 => 172.24.35.255

                Usable Address=172.24.32.1 to 172.24.35.254

 

SUBNET 9 (IT CENTER)

xx xx = 1001

172.24.00xx xx00.0000 0000 => 1001

                Network Address=172.24.0010 0100.0000 0000 => 172.24.36.0

                Broadcast Address=172.24.0010 0111.0000 0000 => 172.24.39.255

                Usable Address=172.24.36.1 to 172.24.39.254

 

ULEARN System Server IP Address = 172.24.36.5