Question 280 of 1,958
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350-401 Practice Question: Consider the following configuration: router…
Consider the following configuration:
router eigrp 100 network 10.0.0.0 0.255.255.255 passive-interface default no passive-interface GigabitEthernet0/0
Which statement is true about this EIGRP configuration?
⚠ Common exam trap
Cisco often tests the interaction between `passive-interface default` and `no passive-interface` to see if candidates understand that the default passive setting overrides all interfaces except those explicitly enabled, rather than the reverse.
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 send and receive updates only on GigabitEthernet0/0.
The `passive-interface default` command sets all interfaces to passive by default, preventing EIGRP from sending or receiving hello packets (and thus updates) on them. The `no passive-interface GigabitEthernet0/0` command then overrides this default for that specific interface, allowing EIGRP to send and receive updates only on GigabitEthernet0/0. The network statement 10.0.0.0 0.255.255.255 enables EIGRP on any interface matching the 10.0.0.0/8 range, but the passive-interface logic restricts actual adjacency formation.
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 send and receive updates only on GigabitEthernet0/0.
Why this is correct
All interfaces are passive by default, but Gi0/0 is explicitly enabled for EIGRP updates.
- ✗
EIGRP will send updates on all interfaces except GigabitEthernet0/0.
Why it's wrong here
The passive-interface default makes all interfaces passive; the 'no passive-interface' overrides that for Gi0/0, so only Gi0/0 sends updates.
- ✗
EIGRP will not send any updates because the network statement is incorrect.
Why it's wrong here
The network statement is valid (wildcard mask 0.255.255.255 matches 10.0.0.0/8).
- ✗
EIGRP will form adjacencies on all interfaces that have an IP address in the 10.0.0.0/8 range.
Why it's wrong here
The passive-interface default prevents adjacencies on all interfaces except those with 'no passive-interface'.
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 24, 2026
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