What is FLSM?
FLSM, short for Fixed Length Subnet Mask, is one of the subnet address allocation methods used in computer networking. It is a technique that allows efficient allocation of IP addresses within a network by dividing it into smaller subnets of fixed size.
How does FLSM work?
In FLSM, the subnet mask is divided into fixed-length blocks, with each block representing a specific number of IP addresses. This allows network administrators to allocate the exact number of addresses required for each subnet, resulting in efficient address allocation.
For example, let’s say we have a network with a subnet mask of 255.255.255.0. This subnet mask allows for 254 usable IP addresses. Using FLSM, we can divide this network into smaller subnets, each with a fixed number of addresses.
For instance, if we need a subnet for a department with 30 devices, we can allocate a subnet with a subnet mask of 255.255.255.224 (/27). This allows for 30 usable IP addresses, with 2 addresses reserved for network address and broadcast address respectively.
FLSM allows network administrators to create subnets of different sizes, based on the number of devices or hosts required in each subnet. By carefully planning and allocating the subnet masks, it becomes easier to manage IP addresses within a network.
Benefits of FLSM
FLSM offers several benefits in network management:
1. Efficient address allocation: FLSM allows network administrators to allocate IP addresses with precision, avoiding address wastage.
2. Scalability: By dividing a network into smaller subnets of fixed size, FLSM provides scalability for future network growth. It becomes easier to add or remove subnets as required.
3. Simplified management: With FLSM, it is easier to track and manage IP addresses within a network. Each subnet has a predictable number of hosts, making it simpler to troubleshoot and diagnose network issues.
4. Improved security: By using FLSM, network administrators can implement more granular security measures. Each subnet can be treated as a separate security domain, allowing for better control and segmentation of network traffic.
In conclusion, FLSM is a subnet address allocation method that enables efficient management of IP addresses within a network. By dividing the network into fixed-length subnets, FLSM allows for precise allocation, scalability, simplified management, and improved security. It is a valuable technique for network administrators seeking optimal address allocation and network organization.
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