Subnetting in IPv4 networks primarily provides which benefits?

• A. Faster routing
• B. Divides networks into smaller parts for efficient address usage and broadcast containment
• C. Higher bandwidth
• D. DNS resolution

Answer: (B)

Subnetting splits a larger IPv4 network into multiple smaller networks. Each subnet has its own network address and its own broadcast domain, so devices on different subnets must use a router to communicate. This arrangement limits broadcast traffic to within each subnet, reducing unnecessary ARP and broadcast load on the entire network. It also lets you allocate addresses more precisely to fit actual needs, avoiding waste and making routing simpler and more scalable by grouping related devices into appropriate subnets. That combination—dividing networks for efficient address usage and containing broadcasts—is exactly what subnetting provides. The other options don’t describe a direct benefit of subnetting: it doesn’t inherently speed up routing, increase bandwidth, or affect DNS resolution.