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VLSM (Variable Length Subnet Mask) Allows more than one subnet mask to exist within a network allows subnetting of an already subnetted network address.

More Efficient use of IP addresses- Without the use of VLSM, companies must implement a single subnet mast within an entire Class A, B, or C network number.

Greater capability to use route summarization - VLSM allows more hierarchical levels within an addressing plan and thus allows better route summarization within routing tables.

Isolation of topology changes from other routers- Another advantage to using VLSM enabled route summarization in a large, complex network is that it can isolate topology changes from other routers.

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