Inter-area routing applies to inter-area topics. OSPF stipulates that routing information is not allowed to be published directly between two non-backbone areas. Routing information is only allowed…

Question

Options

• ATRUE
• BFALSE

• A
  23% (11)
• B
  77% (37)

Explanation

B is correct because the concluding claim - that every ABR must be directly connected to the backbone area - is not absolute. OSPF supports virtual links, which allow an ABR to maintain logical backbone connectivity even without a physical interface in Area 0. This is a deliberate OSPF mechanism for handling discontiguous or impractically designed topologies.

Why A is wrong: Accepting the statement as fully TRUE ignores the virtual link exception. The premises about inter-area routing passing through the backbone are essentially correct, but the final conclusion overstates the requirement by implying only direct physical connections are valid.

Memory tip: Remember "the backbone is required, but the path can be virtual." Area 0 must always be involved in inter-area routing, but that involvement can be achieved through a virtual link rather than a mandatory direct physical interface - so "must be connected" does not mean "must have a direct interface."

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