mediumMultiple ChoiceObjective-mapped
300-410 Practice Question: Is troubleshooting OSPFv2 route redistribution
A network engineer is troubleshooting OSPFv2 route redistribution. R1 is an ASBR redistributing static routes into OSPF. R2, an internal router, receives the redistributed routes but they appear as O E2 routes. However, R1 also has a directly connected network 10.1.1.0/24 that is not being advertised as an OSPF route. 'show ip ospf database external' on R2 shows the redistributed static routes but not the connected network. What is the most likely cause?
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 ASBR is missing the 'redistribute connected' command under the OSPF process.
By default, OSPF does not redistribute connected routes unless explicitly configured. The ASBR must use the 'redistribute connected' command under the OSPF process to advertise directly connected networks. The static routes are being redistributed because they are matched by the 'redistribute static' command, but the connected network is not part of the static route set unless it is also a static route. The engineer likely forgot to add 'redistribute connected' or use the 'subnets' keyword.
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 connected network is not included in the redistribution because the engineer used 'redistribute static' without the 'subnets' keyword.
Why it's wrong here
The 'subnets' keyword affects how classful networks are redistributed, but the connected network is not a static route, so it would not be redistributed by 'redistribute static' at all.
- ✗
The connected network is not being advertised because it is not part of the OSPF process; the engineer must configure 'network 10.1.1.0 0.0.0.255 area 0' under router ospf.
Why it's wrong here
That would make the connected network an internal OSPF route, not a redistributed route, but the question is about redistribution; however, the symptom is that the connected network is not in the OSPF database at all, so either method would work, but the most likely cause is that the ASBR is not redistributing connected routes.
- ✓
The ASBR is missing the 'redistribute connected' command under the OSPF process.
Why this is correct
Without 'redistribute connected', the directly connected network is not advertised into OSPF, even if the interface is enabled for OSPF (which it may not be).
- ✗
The connected network is a loopback interface, and OSPF does not advertise loopback networks by default.
Why it's wrong here
OSPF can advertise loopback interfaces if they are part of the OSPF process via network statements or redistribution.
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
Route Redistribution Between Protocols
Route redistribution between protocols is the process of taking routes learned from one routing protocol and injecting them into another routing protocol so that networks using different protocols can communicate.
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