hardMultiple ChoiceObjective-mapped
300-410 Practice Question: Examine this configuration on Router R6: router…
Examine this configuration on Router R6:
router ospf 1
redistribute eigrp 100 subnets default-information originate always
What is a likely problem with this configuration?
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 will advertise a default route into OSPF even if it does not have a default route itself, potentially causing blackholing.
The 'default-information originate always' will generate a default route into OSPF regardless of whether a default route exists in the routing table. This can cause routing issues if the router does not actually have a default route, as it will attract traffic for unknown destinations.
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 'default-information originate always' command is not allowed with redistribution.
Why it's wrong here
It is allowed, but can cause issues.
- ✓
The router will advertise a default route into OSPF even if it does not have a default route itself, potentially causing blackholing.
Why this is correct
The 'always' keyword forces the default route advertisement regardless of the local routing table.
- ✗
The 'subnets' keyword is missing for EIGRP redistribution.
Why it's wrong here
The 'subnets' keyword is present.
- ✗
The redistribution will only work if EIGRP routes have a metric set.
Why it's wrong here
OSPF redistribution uses a default metric of 20 if not specified, but it will still work.
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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