If all routers in a network use the same subnet mask, what is this known as?

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Multiple Choice

If all routers in a network use the same subnet mask, what is this known as?

Explanation:
Classful routing is at work here. When every router in a network applies the same subnet mask, the network boundaries are defined by the IP address class (Class A, B, or C) and the mask is assumed rather than carried in routing updates. This fixed, class-based approach contrasts with classless (CIDR) routing, where subnets can have different masks and the mask is explicitly shared in routing advertisements. The described setup—uniform mask across all routers—fits the classful routing pattern.

Classful routing is at work here. When every router in a network applies the same subnet mask, the network boundaries are defined by the IP address class (Class A, B, or C) and the mask is assumed rather than carried in routing updates. This fixed, class-based approach contrasts with classless (CIDR) routing, where subnets can have different masks and the mask is explicitly shared in routing advertisements. The described setup—uniform mask across all routers—fits the classful routing pattern.

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