350-401 Practice Question: Consider the following configuration snippet from…

Consider the following configuration snippet from a Cisco IOS-XE router:

router eigrp 100
 network 10.0.0.0
 network 192.168.1.0
 passive-interface default
 no passive-interface GigabitEthernet0/0

What is the effect of the passive-interface commands?

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 hellos are suppressed on all interfaces except GigabitEthernet0/0.

The command 'passive-interface default' makes all interfaces passive by default, meaning they will not send or receive EIGRP hellos. The subsequent 'no passive-interface GigabitEthernet0/0' overrides this for that specific interface, allowing EIGRP adjacency formation on it.

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 hellos are suppressed on all interfaces except GigabitEthernet0/0.
Why this is correct
The default passive suppresses hellos on all interfaces, and the no passive allows them on G0/0.
✗
EIGRP hellos are sent on all interfaces, but updates are blocked.
Why it's wrong here
Passive-interface blocks hellos, not just updates.
✗
EIGRP adjacency is formed on all interfaces except GigabitEthernet0/0.
Why it's wrong here
The opposite is true: adjacency is only formed on G0/0.
✗
EIGRP is disabled on all interfaces.
Why it's wrong here
EIGRP is still enabled but only active on G0/0.

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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