H12-821_V1.0 · Question #687
Which of the following route types can be introduced by OSPF? (Multiple choice)
The correct answer is A. Static routing B. Direct routing C. IS-IS D. BGP E. An OSPF instance different from itself. OSPF supports route redistribution (importing), which allows it to introduce routes learned from virtually any other source into the OSPF routing domain. All five options are valid because OSPF can redistribute static routes (A), directly connected routes (B), IS-IS routes (C)…
Question
Options
- AStatic routing
- BDirect routing
- CIS-IS
- DBGP
- EAn OSPF instance different from itself
How the community answered
(56 responses)- A100% (56)
Explanation
OSPF supports route redistribution (importing), which allows it to introduce routes learned from virtually any other source into the OSPF routing domain. All five options are valid because OSPF can redistribute static routes (A), directly connected routes (B), IS-IS routes (C), BGP routes (D), and even routes from a different OSPF process/instance (E) - this last one is used when multiple OSPF processes run on the same device and need to share route information between them. Since all five are correct, there are no wrong distractors in this question; the trap is assuming OSPF can only redistribute dynamic routing protocols, when in fact it can import static, direct, and multi-protocol sources alike.
Memory tip: Think of OSPF's import feature as a universal adapter - it accepts routes from any source, including its own siblings (other OSPF instances), so when asked what OSPF can introduce, the safe answer is "everything on the list."
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