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300-410 Practice Question: Which statement correctly describes the behavior…
Which statement correctly describes the behavior of the 'subnets' keyword when redistributing into OSPF?
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
✓
It allows OSPF to redistribute subnetted routes in addition to classful networks.
Without the 'subnets' keyword, OSPF redistributes only classful network routes; the 'subnets' keyword allows redistribution of subnetted routes, which is essential for proper routing.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
It causes OSPF to redistribute only classful network routes.
Why it's wrong here
Without 'subnets', only classful routes are redistributed; with 'subnets', subnetted routes are included.
- ✓
It allows OSPF to redistribute subnetted routes in addition to classful networks.
Why this is correct
The 'subnets' keyword enables redistribution of routes with subnet masks, ensuring all prefixes are advertised.
- ✗
It changes the metric of redistributed routes to the interface cost.
Why it's wrong here
The 'subnets' keyword does not affect metric calculation; it only controls prefix granularity.
- ✗
It is required only when redistributing BGP routes into OSPF.
Why it's wrong here
The 'subnets' keyword applies to redistribution from any protocol into OSPF, not just BGP.
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
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