H12-821_V1.0 · Question #883
For a router running the OSPF protocol, all interfaces must belong to the same area.
The correct answer is B. FALSE. B (FALSE) is correct because OSPF explicitly supports multi-area configurations - a router can have different interfaces belonging to different areas simultaneously. A router with interfaces in multiple areas is called an Area Border Router (ABR), and this is a fundamental…
Question
Options
- ATRUE
- BFALSE
- C
- D
How the community answered
(67 responses)- A13% (9)
- B75% (50)
- C4% (3)
- D7% (5)
Explanation
B (FALSE) is correct because OSPF explicitly supports multi-area configurations - a router can have different interfaces belonging to different areas simultaneously. A router with interfaces in multiple areas is called an Area Border Router (ABR), and this is a fundamental design feature of OSPF that enables scalable hierarchical routing.
A (TRUE) is wrong because it contradicts the core OSPF multi-area design; requiring all interfaces on the same area would eliminate the ABR role entirely and defeat the purpose of OSPF's hierarchical architecture.
Memory tip: Think of an ABR as a "border crossing" - it sits with one foot in Area 0 (the backbone) and another foot in a non-backbone area, with each interface assigned to its respective area. If all interfaces had to share one area, there'd be no such thing as a border.
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