easyMultiple Choice
300-410 Practice Question: Runs the following command on Router PE5: PE5#…
A network engineer runs the following command on Router PE5:
PE5# show ip ospf neighbor Neighbor ID Pri State Dead Time Address Interface 10.0.0.7 1 FULL/DR 00:00:32 10.1.1.7 GigabitEthernet0/0 10.0.0.8 1 FULL/BDR 00:00:35 10.2.2.8 GigabitEthernet0/1
Based on this output, which statement is correct?
⚠ Common exam trap
The trap is misreading the State column: candidates see DR/BDR and think it indicates a problem, when FULL/DR and FULL/BDR are the healthy, expected states on a broadcast segment.
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
✓
Both OSPF adjacencies are fully established.
The State column shows FULL/DR for neighbor 10.0.0.7 and FULL/BDR for 10.0.0.8. FULL means the link-state databases are synchronized and the adjacency is fully established on both segments. The DR/BDR roles are normal on a broadcast segment and do not indicate a problem.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Both OSPF adjacencies are fully established.
Why this is correct
The State column shows FULL for both neighbours, meaning the link-state databases have synchronised and adjacency is complete. The /DR and /BDR suffixes only denote designated router roles on their respective segments, not incomplete adjacency.
- ✗
One neighbor is in the EXSTART state.
Why it's wrong here
Both neighbours display FULL/DR and FULL/BDR, indicating adjacency is complete; EXSTART appears only during database description master/slave negotiation. It is tempting because EXSTART is a genuine OSPF neighbour state. It would be correct if the State column showed EXSTART or EXCHANGE rather than FULL.
- ✗
The router is not the DR for any segment.
Why it's wrong here
Both neighbours show FULL/DR and FULL/BDR on different interfaces, meaning PE5 is DROTHER on each segment, so it holds neither role. It is tempting because a single DR per segment is expected, yet the two entries sit on separate interfaces. It would be wrong only if PE5 itself appeared as DR or BDR.
- ✗
There is a mismatch in OSPF area IDs.
Why it's wrong here
FULL/DR and FULL/BDR adjacency states confirm both neighbours reached two-way adjacency, which requires matching area IDs, hello/dead intervals, and MTU. A mismatch would stall at EXSTART or INIT. Area-ID mismatch is a genuine OSPF fault, but this output shows none.
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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JA
Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed September 2026 · checked against the official Cisco exam blueprint
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.