Question 1,225 of 2,152

EIGRP Troubleshooting →mediumMultiple ChoiceObjective-mapped

Understanding show ip eigrp interfaces detail and Split Horizon

This 300-410 practice question tests your understanding of eigrp troubleshooting. Examine the command output carefully: the correct answer depends on what the output actually shows, not on general recall alone. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.

A network engineer runs the following command on Router R1:

R1# show ip eigrp interfaces detail Gi0/0

EIGRP-IPv4 Interfaces for AS(100)

Interface: GigabitEthernet0/0

Peers: 1 Xmit Queue Un/Reliable: 0/0 Mean SRTT: 12 Pacing Time Un/Reliable: 0/10 Multicast Flow Timer: 50 Pending Routes: 0 Hello interval: 5 Hold time: 15 Split horizon: Enabled Next multicast: 0.0.0.0 Next broadcast: 0.0.0.0

Based on this output, what is the problem?

A
Split horizon is enabled, which is a normal and expected configuration.
Split horizon is enabled by default on EIGRP interfaces and helps prevent routing loops.
B
Split horizon is disabled, which could cause routing loops.
Why wrong: The output shows 'Split horizon: Enabled', not disabled.
C
The hold time of 15 seconds is too short and may cause instability.
Why wrong: 15 seconds is the default hold time for EIGRP on LAN interfaces.
D
The interface has no peers, indicating a problem.
Why wrong: The output shows 'Peers: 1', so there is one peer.

Full breakdown with real-world context →

Quick Answer

The answer is that there is no problem; split horizon is enabled, which is a normal and expected configuration. This is correct because split horizon is a fundamental loop prevention mechanism in EIGRP that prevents a route learned on an interface from being advertised back out that same interface, thereby avoiding routing loops. In the context of the Cisco CCNP ENARSI 300-410 exam, this command tests your ability to interpret the show ip eigrp interfaces detail output and recognize that split horizon being enabled is the default and desirable state, not a misconfiguration. A common trap is assuming that split horizon must be disabled for certain hub-and-spoke topologies, but the exam expects you to know it remains enabled unless explicitly changed for specific designs like DMVPN. Memory tip: think of split horizon as a "one-way mirror" — it reflects routes in, but never lets them go back out the same door.

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

✓

Split horizon is enabled, which is a normal and expected configuration.

Option A is correct because split horizon is a default and expected behavior in EIGRP for most interface types, including GigabitEthernet. The output shows 'Split horizon: Enabled', which is normal and prevents routing loops by ensuring that routing information learned on an interface is not advertised back out of that same interface. There is no problem indicated by this setting.

Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.

Answer analysis

Option-by-option breakdown

For each option: why learners choose it and why it is or isn't the right answer here.

✓
Split horizon is enabled, which is a normal and expected configuration.
Why this is correct
Split horizon is enabled by default on EIGRP interfaces and helps prevent routing loops.
Related concept
Read the scenario before looking for a memorised answer.
✗
Split horizon is disabled, which could cause routing loops.
Why it's wrong here
The output shows 'Split horizon: Enabled', not disabled.
✗
The hold time of 15 seconds is too short and may cause instability.
Why it's wrong here
15 seconds is the default hold time for EIGRP on LAN interfaces.
✗
The interface has no peers, indicating a problem.
Why it's wrong here
The output shows 'Peers: 1', so there is one peer.

Common exam traps

Common exam trap: answer the scenario, not the keyword

The trap here is that candidates may mistakenly think split horizon is a problem or misconfiguration, when in fact it is a standard loop-prevention mechanism, and Cisco often tests this by showing a normal default value and asking if it indicates an issue.

Trap categories for this question

Command / output trap
The output shows 'Split horizon: Enabled', not disabled.

Detailed technical explanation

How to think about this question

EIGRP split horizon is enabled by default on most interfaces to prevent routing loops, but it can be disabled on certain interface types like Frame Relay multipoint subinterfaces where it may be necessary for proper route propagation. The 'show ip eigrp interfaces detail' command provides granular per-interface statistics, including the split horizon status, which is critical for troubleshooting EIGRP neighbor relationships and route advertisement behavior in complex topologies.

KKey Concepts to Remember

Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.

TExam Day Tips

Watch for words such as best, first, most likely and least administrative effort.
Review why wrong options are wrong, not only why the correct option is correct.

Key takeaway

Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.

Real-world example

How this comes up in practice

A network engineer segments a warehouse floor into three subnets: 20 scanners, 5 printers, and 2 management hosts. Picking the wrong mask wastes addresses or leaves too few usable hosts. Exam questions test whether you can apply CIDR notation, calculate block size, and identify the correct usable-host range for a given prefix.

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.

What to study next

Got this wrong? Here's your next step.

Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.

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FAQ

Questions learners often ask

What does this 300-410 question test?

EIGRP Troubleshooting — This question tests EIGRP Troubleshooting — Read the scenario before looking for a memorised answer..

What is the correct answer to this question?

The correct answer is: Split horizon is enabled, which is a normal and expected configuration. — Option A is correct because split horizon is a default and expected behavior in EIGRP for most interface types, including GigabitEthernet. The output shows 'Split horizon: Enabled', which is normal and prevents routing loops by ensuring that routing information learned on an interface is not advertised back out of that same interface. There is no problem indicated by this setting.

What should I do if I get this 300-410 question wrong?

Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.

What is the key concept behind this question?

Read the scenario before looking for a memorised answer.

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Same concept, more angles

1 more ways this is tested on 300-410

These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.

Variation 1. A network engineer runs the following command on Router R1: R1# show ip eigrp interfaces EIGRP-IPv4 Interfaces for AS(100) Xmit Queue Mean Pacing Time Multicast Pending Interface Peers Un/Reliable SRTT Un/Reliable Flow Timer Routes Gi0/0 1 0/0 12 0/10 50 0 Gi0/1 1 0/0 15 0/10 50 0 Gi0/2 1 0/0 18 0/10 50 0 Gi0/3 1 0/0 20 0/10 50 0 Gi0/4 0 0/0 0 0/10 50 0 Based on this output, which statement is correct?

medium

✓ A.Interface Gi0/4 has no EIGRP neighbor, which may indicate a configuration issue or lack of connectivity.
B.All interfaces have at least one EIGRP neighbor.
C.The mean SRTT on Gi0/2 is 18 ms, which is too high and indicates a problem.
D.The pending routes count of 0 on all interfaces indicates a routing loop.

Why A: The output shows that interface Gi0/4 has 0 peers, while all other interfaces have 1 peer. In EIGRP, a peer count of 0 indicates that no neighbor adjacency has been formed on that interface. This could be due to a configuration mismatch (e.g., different AS numbers, passive interface, or authentication) or a Layer 1/2 connectivity issue. Therefore, option A is correct.

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