In a given network structure and OSPF partitions shown in the figure. In the figure, except RTA, RTB, RTC and RTD are all ABR routers.

Question

Options

• ATrue
• BFalse

• A
  27% (13)
• B
  73% (35)

Explanation

Option B (False) is correct because the statement incorrectly classifies routers as ABRs without verifying that each meets the OSPF ABR definition: a router must have at least one interface in Area 0 (the backbone) and at least one interface in a non-backbone area. In the figure, at least one of the routers claimed to be an ABR - likely RTD or another - resides entirely within a single area and therefore qualifies only as an internal router, not an ABR. Option A is wrong because accepting the claim at face value ignores the strict OSPF rule that ABR status is determined by area membership, not router placement in the diagram. A helpful memory tip: "ABR = Always Bridges to the Backbone" - if a router doesn't touch Area 0, it simply cannot be an ABR, no matter where it sits in the topology.

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