Question 1,072 of 2,011
mediumMultiple ChoiceObjective-mapped
300-410 Practice Question: Runs the following command on Router R1: R1# show…
A network engineer runs the following command on Router R1:
R1# show ipv6 ospf neighbor Neighbor ID Pri State Dead Time Address Interface 10.1.1.2 1 FULL/BDR 00:00:35 FE80::2 GigabitEthernet0/0 10.1.1.3 1 FULL/DR 00:00:32 FE80::3 GigabitEthernet0/1
Based on this output, which statement is correct regarding OSPFv3?
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
✓
Router R1 has a full adjacency with both neighbors in OSPFv3.
The output shows OSPFv3 neighbors. The neighbor 10.1.1.2 is in state FULL/BDR, meaning it is the Backup Designated Router. The neighbor 10.1.1.3 is in state FULL/DR, meaning it is the Designated Router. The addresses are link-local IPv6 addresses.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Router R1 is the DR on the segment connected to GigabitEthernet0/0.
Why it's wrong here
The neighbor is BDR, so R1 might be DR, but the output does not show R1's own state; the neighbor state is BDR, indicating the neighbor is not DR.
- ✓
Router R1 has a full adjacency with both neighbors in OSPFv3.
Why this is correct
Both neighbors show FULL state, indicating complete adjacency in OSPFv3.
- ✗
The OSPFv3 process is using IPv4 addresses as router IDs.
Why it's wrong here
The neighbor IDs are shown as IPv4 addresses (10.1.1.2, 10.1.1.3), which is common in OSPFv3; router IDs are 32-bit numbers, often represented as IPv4 addresses.
- ✗
Router R1 is not receiving hello packets from 10.1.1.3.
Why it's wrong here
The state is FULL, so hello packets are being received.
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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Last reviewed: Jun 18, 2026
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