SUBNETTING CALCULATION

 

Subnetting Calculation 

Private addressing scheme used in UTeM : 208.198.52.0

A) Number of subnet needed

Inside UTeM campus network, there are 1 IT Centre and 8 Faculties. 9 subnet is needed.

B) Class of IP address

The first octet of IP address is 208(between 192 and 223). Therefore, the IP address is class C with the subnet notation /28.

C) Subnet mask

The subnet mask for the IP address is 255.255.255.240

D) Number of bits borrowed

First octet, second octet and third octet of subnet mask represent host id : 255.255.255

The fourth octet of subnet mask is 240 = 11110000 ( there are 4 bits of 1s), this means the number of bits borrowed is 4 bits.

E) Number of subnet

= 16 subnets

S : Number of bits borrowed

F) Quantity of host per subnet

255.255.255.11110000 (there are 4 bits of 0s)

= 14 valid host
H : number of bits left

G) Block size

Fourth octet subnet mask : 240

256 - 240 = 16 ( block size per subnet )

H) The IP table

• Subnet 0 indicate Faculty 1 : 208.198.52.0/28
• Subnet 1 indicate Faculty 2 : 208.198.52.16/28
• Subnet 2 indicate Faculty 3 : 208.198.52.32/28
• Subnet 3 indicate Faculty 4 : 208.198.52.48/28
• Subnet 4 indicate Faculty 5 : 208.198.52.64/28
• Subnet 5 indicate Faculty 6 : 208.198.52.80/28
• Subnet 6 indicate Faculty 7 : 208.198.52.96/28
• Subnet 7 indicate Faculty 8 : 208.198.52.112/28
• Subnet 8 indicate IT Center  : 208.198.52.128/28

From the IT Center network address, the 5th available address as the address of the Ulearn System Server is :

IT Center network address : 208.198.52.128

5th available address :

• 208.198.52.129

• 208.198.52.130

• 208.198.52.131

• 208.198.52.132

• 208.198.52.133