Variable-Length Subnet Masking. A subnet address assignment scheme in which each physical network can have a different mask. The primary advantage is flexibility; however, there is a possibility of address ambiguity, in which an address can be interpreted depending on the physical network. VLSM is useful in a situation where each link in an internetwork must have its own subnet address, each of which in turn must have enough host address to accomodate all attached devices.

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