mediumMultiple ChoiceObjective-mapped
300-410 Practice Question: Consider the following EIGRP configuration on…
Consider the following EIGRP configuration on Router R1:
router eigrp 100 network 10.0.0.0 passive-interface default no passive-interface GigabitEthernet0/0
What is the effect of this configuration?
⚠ Common exam trap
Cisco often tests the interaction between 'passive-interface default' and 'no passive-interface', where candidates mistakenly think the default command blocks all adjacencies permanently or confuse which interfaces are enabled versus disabled.
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
✓
EIGRP will form neighbor adjacencies only on GigabitEthernet0/0.
The 'passive-interface default' command sets all interfaces to passive by default, preventing EIGRP from sending or receiving hello packets on them. The 'no passive-interface GigabitEthernet0/0' command then overrides this default for that specific interface, allowing EIGRP to send and receive hellos and thus form neighbor adjacencies only on GigabitEthernet0/0.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
EIGRP will form neighbor adjacencies on all interfaces.
Why it's wrong here
The passive-interface default command prevents neighbor formation on all interfaces unless explicitly removed.
- ✓
EIGRP will form neighbor adjacencies only on GigabitEthernet0/0.
Why this is correct
The no passive-interface command on GigabitEthernet0/0 allows neighbor formation only on that interface.
- ✗
EIGRP will not form any neighbor adjacencies.
Why it's wrong here
GigabitEthernet0/0 is explicitly enabled, so it will form adjacencies.
- ✗
EIGRP will form neighbor adjacencies on all interfaces except GigabitEthernet0/0.
Why it's wrong here
The no passive-interface command enables neighbor formation on GigabitEthernet0/0, not disables it.
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
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.