200-301 · Question #758
200-301 Question #758: Real Exam Question with Answer & Explanation
The correct answer is B: It is locally significant and is used to identify an instance of the OSPF database.. The OSPF process ID is a number that is unique to a router and identifies a specific instance of the OSPF routing process running on it, along with its associated database.
Question
Which statement describes the process ID that is used to run OSPF on a router?
Options
- AIt is globally significant and is used to represent the AS number.
- BIt is locally significant and is used to identify an instance of the OSPF database.
- CIt is globally significant and is used to identify OSPF stub areas.
- DIt is locally significant and must be the same throughout an area.
Explanation
The OSPF process ID is a number that is unique to a router and identifies a specific instance of the OSPF routing process running on it, along with its associated database.
Common mistakes.
- A. The process ID is not globally significant and does not represent the AS number; OSPF uses area IDs and router IDs for broader identification.
- C. The OSPF process ID is not used to identify OSPF stub areas; stub areas are configured explicitly with the 'area <area-id> stub' command.
- D. Since the process ID is locally significant, it does not need to be the same throughout an area; only the area ID must match among routers in the same area.
Concept tested. OSPF process ID significance
Reference. https://www.cisco.com/c/en/us/support/docs/ip/open-shortest-path-first-ospf/7039-1.html
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