Subnetting

 

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.

 

The answer:

 

For Ulearn System Server Network, the IP address scheme for that system is 192.168.0.0/16. This is Class C private addressing. The default subnet mask is 255.255.255.0.

 

Because it has 30 different departments to fulfill the requirement of 30 subnets. So, we need to borrow bits from the host to provide the number of subnets. In this case, it borrow 5 bits from the host.

 

2ⁿ = 32 networks

2ⁿ = 2⁵   

n = 5 , where n = borrowed bit

 

This illustration uses the network formula to find subnets that are closest to 30.

Image 1 : Network formula

 

Since it 5 borrowed bit from the host, the new IP address scheme is 192.168.0.0/21. So, the new subnet mask is 255.255.248.0/21. The 248 is the number of places for host id that earned by adding the decimal number in base 2.

So, add the decimal number to get 248.

248 = 128 + 64 + 32 + 16 + 8

Next, to get the number of host per subnet:

 

= 2¹¹ ,          where 11 = 16 - 5

=  2046

 

To get the difference between subnet:

 

2046 / 255 = 8

 

No.	Network ID	IP Address Range	Broadcast ID
1.	192.168.0.0/21	192.168.0.1/21 - 192.168.7.254/21	192.168.7.255/21
2.	192.168.8.0/21	192.168.8.1/21 -  192.168.15.254/21	192.168.15.255/21
3.	192.168.16.0/21	192.168.16.1/21 - 192.168.23.254/21	192.168.23.255/21
4.	192.168.24.0/21	192.168.24.1/21 - 192.168.31.254/21	192.168.31.255/21
5.	192.168.32.0/21	192.168.32.1/21 - 192.168.39.254/21	192.168.39.255/21
6.	192.168.40.0/21	192.168.40.1/21 - 192.168.47.254/21	192.168.47.255/21
7.	192.168.48.0/21	192.168.48.1/21 - 192.168.55.254/21	192.168.55.255/21
8.	192.168.56.0/21	192.168.56.1/21 - 192.168.63.254/21	192.168.63.255/21
9.	192.168.64.0/21	192.168.64.1/21 - 192.168.71.254/21	192.168.71.255/21
10.	192.168.72.0/21	192.168.72.1/21 - 192.168.79.254/21	192.168.79.255/21
11.	192.168.80.0/21	192.168.80.1/21 - 192.168.87.254/21	192.168.87.255/21
12.	192.168.88.0/21	192.168.88.1/21 - 192.168.95.254/21	192.168.95.255/21
13.	192.168.96.0/21	192.168.96.1/21 - 192.168.103.254/21	192.168.103.255/21
14.	192.168.104.0/21	192.168.104.1/21 - 192.168.111.254/21	192.168.111.255/21
15.	192.168.112.0/21	192.168.112.1/21 - 192.168.119.254/21	192.168.119.255/21
16.	192.168.120.0/21	192.168.120.1/21 - 192.168.127.254/21	192.168.127.255/21
17.	192.168.128.0/21	192.168.128.1/21 - 192.168.135.254/21	192.168.135.255/21
18.	192.168.136.0/21	192.168.136.1/21 - 192.168.143.254/21	192.168.143.255/21
19.	192.168.144.0/21	192.168.144.1/21 - 192.168.151.254/21	192.168.151.255/21
20.	192.168.152.0/21	192.168.152.1/21 - 192.168.159.254/21	192.168.159.255/21
21.	192.168.160.0/21	192.168.160.1/21 - 192.168.167.254/21	192.168.167.255/21
22.	192.168.168.0/21	192.168.168.1/21 - 192.168.175.254/21	192.168.175.255/21
23.	192.168.176.0/21	192.168.176.1/21 - 192.168.183.254/21	192.168.183.255/21
24.	192.168.184.0/21	192.168.184.1/21 - 192.168.191.254/21	192.168.191.255/21
25.	192.168.192.0/21	192.168.192.1/21 - 192.168.199.254/21	192.168.199.255/21
26.	192.168.200.0/21	192.168.200.1/21 - 192.168.207.254/21	192.168.207.255/21
27.	192.168.208.0/21	192.168.208.1/21 - 192.168.215.254/21	192.168.215.255/21
28.	192.168.216.0/21	192.168.216.1/21 - 192.168.223.254/21	192.168.223.255/21
29.	192.168.224.0/21	192.168.224.1/21 - 192.168.231.254/21	192.168.231.255/21
30.	192.168.232.0/21	192.168.232.1/21 - 192.168.239.254/21	192.168.239.255/21
31.	192.168.240.0/21	192.168.240.1/21 - 192.168.247.254/21	192.168.247.255/21
32.	192.168.248.0/21	192.168.248.1/21 - 192.168.255.254/21	192.168.255.255/21

ULearn System Server IP Address : 

192.168.80.1/21 - 192.168.87.254/21

Network ID : 192.168.80.0/21

Broadcast ID : 192.168.87.255/21