Designing Cisco Network Service Architectures (ARCH, legacy) — Question 34

An engineer is attempting to improve OSPF network performance and discovers that the entire SPT recomputes whenever a type 1 or type 2 LSA is received within an area.
Which action can optimize SPT operations?

Answer options

• A. Tune LSA throttling thresholds.
• B. Enable incremental SPF.
• C. Configure totally stubby areas throughout the domain.
• D. Summarize networks on all ABRs.

Correct answer: B

Explanation

Enabling incremental SPF allows OSPF to only recalculate the affected part of the SPT rather than the entire tree when a new LSA is received, thus improving efficiency. The other options either do not directly address SPT optimization or pertain to different OSPF configurations that do not reduce the SPT recalculation impact.