IP SUBNETTING AND EXAMPLE

       

Subnetting is a method to increase network ID of a network ID telahanda have.
The formula for calculating the number of subnets is: 2n -2 n is the number of bits covered
The formula to calculate the number of hosts per subnet = 2N - 2 N is the number of bits remaining for the host ID
and there is some kind of subnetting are:
Subnetting Class A
Subnetting Class B
Subnetting Class C

1. Examples of cases that occurred Subnetting with a NETWORK ADDRESS10.0.0.0 / 16.
SUBNETTING IP ADDRESS IN CLASS A
Class A in octet 2, 3 and 4 (3 last octet). Then subnet mask that could be used for subnetting the class A subnet mask is all of CIDR / 8 to / 30.
Analysis:
10.0.0.0 means class A, with the Subnet Mask / 16 means 11111111.11111111.00000000.00000000 (255.255.0.0).
Calculation:
1. Number of Subnet = 28 = 256 subnet
2. The number of hosts per subnet = 216-2 = 65534 hosts
3. Block Subnet = 256-255 = 1. So the full subnet: 0,1,2,3,4, etc.
1. Examples of cases that occurred Subnetting with a NETWORK ADDRESS172.16.0.0 / 18 dan172.16.0.0 / 25.
               SUBNETTING IP ADDRESS ON CLASS B
Based subnetnya block. CIDR / 17 to / 24 do exactly the same as subnetting Class C, just blocks subnetnya we enter directly into the third octet, not as Class C "played" in the fourth octet. While CIDR / 25 to / 30 (multiplier) block subnet we "play" in the fourth octet, but after finishing third octet walk forward (coeunter) of 0, 1, 2, 3, and so on.
>> Example network address 172.16.0.0/25.
Analysis:
172.16.0.0 means the class B, the Subnet Mask / 25 means 11111111.11111111.11111111.10000000 (255 255 255 128).
Calculation:
1. Number of Subnet = 29 = 512 subnet
2. The number of hosts per subnet = 27-2 = 126 hosts
3. Block Subnet = 256-128 = 128. So complete is (0, 128)
1. Examples of cases that occurred Subnetting with a NETWORK ADDRESS192.168.1.0 / 26
SUBNETTING IP ADDRESS IN CLASS C
Analysis :
192.168.1.0 means a class C subnet mask / 26 means 11111111.11111111.11111111.11000000 (255.255.255.192).
Calculation:
1. Number of Subnet = 2x, where x is the number of binary 1 in the last octet subnet mask (the last two octets for class B, and 3 last octet for class A). So the amount subnet is 22 = 4 subnets
2. The number of hosts per subnet = 2y - 2, where y is the opposite of x is the number of binary 0 in the last octet subnet. So the number of hosts per subnet is 26-2 = 62 hosts
3. Block Subnet = 256-192 (last octet subnet mask value) = 64. The next subnet is 64 + 64 = 128, and 128 + 64 = 192. So full subnets are 0, 64, 128, 192

Use of Subnetting

          Subnet made to limit the scope of broadcast traffic, for implementing network security measures, to separate network segments by function, and / or to assist in resolving network congestion problems ..,
A subnet is usually composed of a network router, a switch or hub, and at least one host.