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300-410 Practice Question: Review the following OSPF configuration on router…
Review the following OSPF configuration on router R4:
router ospf 1 network 10.0.0.0 0.255.255.255 area 0 area 1 range 10.0.0.0 255.255.255.0
What is missing or incorrect in this configuration for proper route summarization?
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
✓
The router must have interfaces in area 1 for the summarization to take effect.
The area range command is used on an ABR to summarize routes from one area into another. Here, area 1 is specified, but router R4 only has network statements in area 0, so it is not an ABR for area 1. The command will have no effect.
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 must have interfaces in area 1 for the summarization to take effect.
Why this is correct
Correct. The area range command only works if the router is an ABR, meaning it has interfaces in multiple areas.
- ✗
The mask should be 0.0.0.255 instead of 255.255.255.0.
Why it's wrong here
Incorrect. The mask is correct for a /24 prefix.
- ✗
The command should be 'summary-address' instead of 'area range'.
Why it's wrong here
Incorrect. OSPF uses 'area range' for inter-area summarization.
- ✗
The network statement should include area 1.
Why it's wrong here
Incorrect. The network statement is not the issue; the router needs interfaces in area 1.
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.
Go deeper
Related to this question
Learn chapter
Introduction to ENARSI Exam and Network Fundamentals
Key term
BGP Route Aggregation
BGP Route Aggregation is a technique that combines multiple specific network routes into a single summary route to reduce the size of routing tables and improve network efficiency.
Key term
OSPF Route Summarization
OSPF route summarization is a technique that combines multiple smaller network routes into a single, larger route advertisement to reduce the size of routing tables and improve network stability.
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