- A subnet work or subnet is a logical subdivision of an IP network.
- The practice of dividing a network into two more network is called subneting.
- Subnet mask differentiates the network and host portion of an IP addresses.
- Represented with all 1's in the network portion and with all 0's in the host portion.
Working:
- A mask operation is a bitwise AND of two binary numbers, the address and the mask.
Types:
Fixed Length Subnet Mask:
- It is a sequence of numbers of unchanging length that streamlines packet routing with in the subnet of proprietary network.
- A subnet can be a geographically defined LAN.
Variable Length Subnet Mask:
- It allows network engineers to divide an IP address space into hierarchy of subnets of different sizes.
- By making it possible to create subnets with very different host counts without wasting large number of addresses.
Use:
- For security.
- For decreasing network traffic.
Advantages:
- It provides security.
- It allows organization of resources.
- It speeds up the network.
Disadvantages:
- Subnetting cost is high.
- All subnets must be the same size in fixed length subnet mask.
Examples:
My notes images:
My notes images:
