Free CompTIA Network+ N10-009 Practice Question

A Variable Length Subnet Mask (VLSM) allows for subnets of varying sizes to be created from the same network address, offering more flexibility and efficient use of IP address space. This reduces wastage of IP addresses, which is crucial for large networks. Answer B is correct because it reflects the capacity of VLSM to adapt the subnet mask to fit the size of the network, a feature not offered by fixed-length subnet masks. Answer A is incorrect because VLSM does not target security improvements directly—security is managed through other means. Answer C is incorrect as increasing transmission speed is related to network bandwidth and hardware capabilities, not subnetting. Answer D incorrectly associates VLSM with reducing the number of routers, which relates more to network topology and design considerations.