Classful routing protocols can be used in networks with either discontiguous subnets or networks using variable length subnet masks (VLSM).

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Quizplus · Accepted Answer

Classful routing protocols do not support discontiguous subnets or VLSM, as they rely on the default subnet mask of the specific class of the network address (e.g. Class A networks use a default subnet mask of 255.0.0.0, Class B networks use a default subnet mask of 255.255.0.0, etc.).

Classful Routing Protocols Can Be Used in Networks with Either