Which statement is true, as relates to classful or classless routing?

Question

Options

• AClassful routing protocols send the subnet mask in routing updates.
• BRIPv1 and OSPF are classless routing protocols.
• CAutomatic summarization at classful boundaries can cause problems on discontinuous subnets.
• DEIGRP and OSPF are classful routing protocols and summarize routes by default.

• A
  14% (5)
• B
  6% (2)
• C
  71% (25)
• D
  9% (3)

Explanation

Automatic summarization at classful boundaries causes problems with discontinuous subnets. A discontinuous network occurs when the same major classful network (e.g., 10.0.0.0/8) is separated by a different major network. Classful protocols like RIPv1 and RIPv2 (with auto-summary enabled) summarize subnets to the classful boundary, causing remote subnets of the same major network to be unreachable or routed incorrectly. Option A is wrong - classful protocols do NOT send subnet masks; classless protocols do. Option B is wrong - RIPv1 is classful, not classless; OSPF is classless. Option D is wrong - EIGRP and OSPF are classless protocols, though EIGRP can be configured to summarize automatically.

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