PPT ON SUBNETTING

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SUBNETTING  Presentation Transcript

1.SUBNETTING

2.SUBNETTING
A set of techniques that you can use to efficiently divide the address space of a unicast address prefix for allocation among the subnets of an organization network  
Allows you to create multiple logical networks that exist within a single Class A, B, or C network.

3.IP addresses are designed with two levels of hierarchy.

4.A network with two levels of hierarchy (not subnetted)

5.A network with three levels of
hierarchy (subnetted)

6.Addresses in a network with and without subnetting

7.Finding the Subnet Address
Given an IP address, we can find the subnet address by applying the mask to the address. We can do this in two ways: straight or short-cut.

8.Straight Method
In the straight method, we use binary notation for both the address and the mask and then apply the AND operation to find the subnet address.

9.What is the subnetwork address if the destination address is 200.45.34.56 and the subnet mask is 255.255.240.0?

10.What is the subnetwork address if the destination address is 19.30.80.5 and the mask is 255.255.192.0?

11.Comparison of a default mask and
a subnet mask

12.The number of subnets must be a power of 2.

13.The company needs six subnets. This number 6 is not a power of 2. The next number that is a power of 2 is 8 (23). We need 3 more 1s in the subnet mask. The total number of 1s in the subnet mask is 27 (24 + 3).
The total number of 0s is 5 (32 - 27). The mask is

14.The company needs 1000 subnets. This number is not a power of 2. The next number that is a power of 2 is 1024 (210). We need 10 more 1s in the subnet mask.
The total number of 1s in the subnet mask is 26 (16 + 10).
The total number of 0s is 6 (32 - 26).