In: Computer Science
1) Suppose we have the following IP addresses for two different organizations, we have to create 5 networks having 30 hosts in it. Find first sub network ID, Fist address, Last address and Broadcast for each of the following given addresses?
a) 14.23.120.8
b) 252.5.15.111
| 
 Network ID  | 
 First address  | 
 Last address  | 
 Broadcast  | 
| 
 14.23.120.0  | 
 14.23.120.1  | 
 14.23.120.30  | 
 14.23.120.31  | 
| 
 14.23.120.32  | 
 14.23.120.33  | 
 14.23.120.62  | 
 14.23.120.63  | 
| 
 14.23.120.64  | 
 14.23.120.65  | 
 14.23.120.94  | 
 14.23.120.95  | 
| 
 14.23.120.96  | 
 14.23.120.97  | 
 14.23.120.126  | 
 14.23.120.127  | 
| 
 14.23.120.128  | 
 14.23.120.129  | 
 14.23.120.158  | 
 14.23.120.159  | 
We need 30 hosts per subnet and formula of IPv4 is 2^n where n is number of bits to borrow from default subnet mask where here default subnet mask is used for class c which is 255.255.255.0 where 256 hosts are available but we divide it into 5 subnet so we cant get that exact number as 2^n is applied so we will get 8 subnet 2^3=8 so we need 3 bits to borrow from 255.255.255.0 so new subnet mask will be 255.255.255.224 and bits are borrowed from binary so for clarification.
11111111.11111111.11111111.00000000 for 255.255.255.0
11111111.11111111.11111111.11100000 new subnet mask with 8 subnet
255.255.255.224
same calculation for 2nd network
| 
 Network ID  | 
 First address  | 
 Last address  | 
 Broadcast  | 
| 
 252.5.15.0  | 
 252.5.15.1  | 
 252.5.15.30  | 
 252.5.15.31  | 
| 
 252.5.15.32  | 
 252.5.15.33  | 
 252.5.15.62  | 
 252.5.15.63  | 
| 
 252.5.15.64  | 
 252.5.15.65  | 
 252.5.15.94  | 
 252.5.15.95  | 
| 
 252.5.15.96  | 
 252.5.15.97  | 
 252.5.15.126  | 
 252.5.15.127  | 
| 
 252.5.15.128  | 
 252.5.15.129  | 
 252.5.15.158  | 
 252.5.15.159  | 
if you have any doubt then please ask me without any hesitation in the comment section below , if you like my answer then please thumbs up for the answer , before giving thumbs down please discuss the question it may possible that we may understand the question different way and i can edit and change the answers if you argue, thanks :)