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300-410 Practice Question: Runs the following command to verify OSPF SPF…
A network engineer runs the following command to verify OSPF SPF calculations:
R1# show ip ospf statistics
OSPF Router with ID (1.1.1.1) (Process ID 1)
Area 0: SPF algorithm executed 12 times
SPF calculation time (in msec): Total: 12, Average: 1.0 Minimum: 0, Maximum: 2 Last SPF due to: LSA change Number of LSA changes: 5 Number of LSA deletions: 2 Number of LSA additions: 3 Number of LSA updates: 0
Area 1: SPF algorithm executed 3 times
SPF calculation time (in msec): Total: 3, Average: 1.0 Minimum: 0, Maximum: 1 Last SPF due to: LSA change Number of LSA changes: 2 Number of LSA deletions: 0 Number of LSA additions: 2 Number of LSA updates: 0
What does this output indicate?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Area 0 has experienced more network changes than Area 1, as indicated by higher SPF runs and LSA changes.
The output shows OSPF SPF statistics for multiple areas, including number of SPF runs and LSA changes.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
The router has not performed any SPF calculations.
Why it's wrong here
SPF has been executed 12 times in area 0 and 3 times in area 1.
- ✓
Area 0 has experienced more network changes than Area 1, as indicated by higher SPF runs and LSA changes.
Why this is correct
Area 0 has 12 SPF runs and 5 LSA changes, while Area 1 has 3 SPF runs and 2 LSA changes.
- ✗
The SPF calculation time is too high, indicating a performance issue.
Why it's wrong here
The average SPF time is 1 msec, which is very low and normal.
- ✗
The last SPF was triggered by a timer expiry.
Why it's wrong here
The last SPF was due to an LSA change, not timer expiry.
Visual reference
Quick reference
Routing Protocol Comparison
| Protocol | Metric | Max Hops | Algorithm | Type |
|---|---|---|---|---|
| RIP v2 | Hop count | 15 | Bellman-Ford | Distance vector |
| OSPF | Cost (bandwidth) | Unlimited | Dijkstra (SPF) | Link state |
| EIGRP | Composite metric | Unlimited | DUAL | Hybrid |
| IS-IS | Cost | Unlimited | Dijkstra | Link state |
| BGP | Policy / attributes | Unlimited | Path vector | Path vector |
RIP's 15-hop limit makes it unsuitable for large networks. OSPF and EIGRP dominate modern enterprise deployments.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This 300-410 practice question is part of Courseiva's free Cisco certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the 300-410 exam.