350-401 · Question #332
Which two statements about OSPF are true? (Choose two.)
The correct answer is B. Intra-area routes are preferred over interarea routes. C. External type 1 routes are preferred over external type 2 routes.. In OSPF, intra-area routes are preferred over inter-area routes, and external Type 1 routes are preferred over external Type 2 routes.
Question
Options
- AExternal type 2 routes are preferred over interarea routes.
- BIntra-area routes are preferred over interarea routes.
- CExternal type 1 routes are preferred over external type 2 routes.
- DExternal type 1 routes are preferred over intra-area routes.
- EExternal type 2 routes are preferred over external type 1 routes.
How the community answered
(20 responses)- B85% (17)
- D10% (2)
- E5% (1)
Why each option
In OSPF, intra-area routes are preferred over inter-area routes, and external Type 1 routes are preferred over external Type 2 routes.
Inter-area routes are preferred over any type of external OSPF route (Type 1 or Type 2).
OSPF prioritizes route types, and intra-area routes (learned within the same area) are always preferred over inter-area routes (learned from a different area via an ABR).
When comparing external OSPF routes, Type 1 (E1) routes are preferred over Type 2 (E2) routes because E1 routes add the internal cost to reach the ASBR to their external metric, providing a more accurate total path cost.
Intra-area routes are the most preferred route type in OSPF and are always preferred over any external OSPF routes, including External Type 1 routes.
External Type 1 routes are preferred over External Type 2 routes in OSPF due to how their metrics are calculated and compared.
Concept tested: OSPF route preference hierarchy
Source: https://www.cisco.com/c/en/us/support/docs/ip/open-shortest-path-first-ospf/13682-16.html
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