What Does FLSM Mean in 200-301?
Full form: Fixed Length Subnet Masking
Also known as: Fixed Length Subnet Masking
Quick Definition
Using the same subnet mask length for all subnets in a network.
Full Definition
FLSM uses a single subnet mask size for all subnets derived from a major network. Every subnet has the same number of host addresses regardless of actual need. This is simpler to design but wasteful — a point-to-point WAN link gets the same large subnet as a building LAN. FLSM is typically only seen in networks using classful routing protocols such as RIPv1.
Exam Trap — Don't Get Fooled
FLSM is associated with classful routing protocols (RIPv1) that do not carry subnet mask information. Modern networks use VLSM.
Related 200-301 Terms
Frequently Asked Questions
What does FLSM mean on the 200-301 exam?
FLSM uses a single subnet mask size for all subnets derived from a major network. Every subnet has the same number of host addresses regardless of actual need. This is simpler to design but wasteful — a point-to-point WAN link gets the same large subnet as a building LAN. FLSM is typically only seen in networks using classful routing protocols such as RIPv1.
How does FLSM appear as a trap on the 200-301?
FLSM is associated with classful routing protocols (RIPv1) that do not carry subnet mask information. Modern networks use VLSM.
How important is FLSM on the 200-301 exam?
FLSM falls under the IP Addressing domain of the 200-301 exam. Understanding it in context with related terms like vlsm and cidr is essential for answering scenario-based questions correctly.