mediumMultiple ChoiceObjective-mapped
300-410 Practice Question: Runs the following command on Router R1: R1# show…
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?
⚠ Common exam trap
Cisco often tests the misinterpretation of SRTT values as indicators of problems, when in fact normal SRTT values vary by network and are not inherently problematic unless they are excessively high (e.g., >5000 ms) or accompanied by retransmissions.
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
✓
Interface Gi0/4 has no EIGRP neighbor, which may indicate a configuration issue or lack of connectivity.
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.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Interface Gi0/4 has no EIGRP neighbor, which may indicate a configuration issue or lack of connectivity.
Why this is correct
A peer count of 0 means no EIGRP adjacency exists on that interface.
- ✗
All interfaces have at least one EIGRP neighbor.
Why it's wrong here
Gi0/4 has 0 peers, so not all interfaces have a neighbor.
- ✗
The mean SRTT on Gi0/2 is 18 ms, which is too high and indicates a problem.
Why it's wrong here
18 ms is a normal SRTT value for EIGRP.
- ✗
The pending routes count of 0 on all interfaces indicates a routing loop.
Why it's wrong here
A pending routes count of 0 is normal and indicates no routes are waiting to be processed.
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
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