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300-410 Practice Question: Examine this OSPF configuration on router R5:…
Examine this OSPF configuration on router R5:
router ospf 1 network 10.0.0.0 0.255.255.255 area 0 passive-interface default no passive-interface GigabitEthernet0/0
What is the effect of the passive-interface default command?
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
✓
All interfaces except GigabitEthernet0/0 will be passive; GigabitEthernet0/0 will send and receive OSPF hellos.
The passive-interface default command sets all interfaces as passive by default, meaning they will not send OSPF hello packets or form adjacencies. The no passive-interface command then overrides this for the specified interface, allowing it to form adjacencies.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
All interfaces except GigabitEthernet0/0 will be passive; GigabitEthernet0/0 will send and receive OSPF hellos.
Why this is correct
Correct. The default passive is overridden for GigabitEthernet0/0.
- ✗
All interfaces are passive, including GigabitEthernet0/0, because the no passive-interface command is ignored.
Why it's wrong here
Incorrect. The no passive-interface command takes precedence.
- ✗
Only interfaces with network statements will be affected; other interfaces remain active.
Why it's wrong here
Incorrect. The passive-interface default applies to all interfaces, regardless of network statements.
- ✗
The configuration is invalid because passive-interface default cannot be used with OSPF.
Why it's wrong here
Incorrect. It is a valid OSPF command.
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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