mediumMultiple Choice
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 traffic
EIGRP-IPv4 Traffic Statistics for AS(100) Hellos sent/received: 5000/4995 Updates sent/received: 150/148 Queries sent/received: 10/8 Replies sent/received: 8/10 Acks sent/received: 300/298 Input queue high water mark: 10 Input queue drops: 0 SIA-Queries sent/received: 0/0 SIA-Replies sent/received: 0/0 Hello process ID: 123 PDM process ID: 124 Socket queue: 0/2000/10/0 (current/max/highest/drops) Input queue: 0/2000/10/0 (current/max/highest/drops)
Based on this output, which statement is correct?
⚠ Common exam trap
Cisco often tests the misconception that an imbalance in query/reply counts automatically indicates a problem, when in fact small differences are normal and only significant, persistent mismatches with other symptoms (like SIA events) indicate trouble.
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
✓
The EIGRP process is operating normally with no signs of issues.
The output shows normal EIGRP operation: Hellos are exchanged nearly equally (5000 sent vs 4995 received), Updates, Queries, Replies, and Acks are balanced, and both input queue drops and SIA counters are zero. This indicates stable neighbor relationships and no packet loss or stuck-in-active events, confirming the EIGRP process is functioning without issues.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
The EIGRP process is operating normally with no signs of issues.
Why this is correct
Zero input queue drops, zero SIA queries and replies, and balanced Hello, Update, Query, Reply and Ack counters across sent and received all confirm stable adjacency and reliable transport. No stuck-in-active condition or queue congestion exists, so the EIGRP process is healthy.
- ✗
There is a problem because more queries were sent than replies received.
Why it's wrong here
Queries and replies are independent counters; 10 queries sent versus 8 replies received is normal, since some queries need no reply or arrive from other neighbours. The asymmetry is tempting as a fault indicator, but SIA-Queries and SIA-Replies both read 0, confirming no stuck-active routes.
- ✗
The input queue drops of 0 indicate that the router is not processing EIGRP packets.
Why it's wrong here
Zero input queue drops means no EIGRP packets were discarded from the queue, not that processing stopped; the counters show active Hellos, Updates and Acks. Input queue drops would be the answer if the question asked about queue overflow or CPU starvation.
- ✗
The SIA-Queries count of 0 indicates that the network has experienced stuck-in-active events.
Why it's wrong here
Zero SIA-Queries and SIA-Replies indicate no stuck-in-active events occurred, since those counters increment only when a route stays Active past the query timeout. SIA counters would be the answer if the question asked how to confirm SIA conditions.
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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