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350-401 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: 1000/950 Updates sent/received: 45/40 Queries sent/received: 2/3 Replies sent/received: 3/2 Acks sent/received: 50/48 Input queue high water mark: 1 Input queue depth: 0 Total packets sent: 1100 Total packets received: 1043
Based on this output, what can be concluded?
⚠ Common exam trap
Cisco often tests the misconception that a high number of Hellos indicates instability or that a small difference between sent and received packets automatically means packet loss, when in fact EIGRP Hellos are sent unreliably (multicast) and may be lost without retransmission, so a small discrepancy is normal.
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 network is stable with few topology changes.
The output shows a very low number of EIGRP Queries (2 sent, 3 received) and Replies (3 sent, 2 received), which indicates that the network has experienced very few topology changes. A stable EIGRP network with minimal route flaps will have a high ratio of Hellos to Updates/Queries, as seen here (1000 Hellos vs. 45 Updates). Therefore, the network is stable with few topology changes, making option B 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.
- ✗
The router has experienced many route flaps.
Why it's wrong here
Route flaps would generate many updates and queries; the numbers are low.
- ✓
The network is stable with few topology changes.
Why this is correct
Low query and reply counts indicate stable topology.
- ✗
The router is using EIGRP stub to suppress queries.
Why it's wrong here
Stub routers would not send queries; but the router has sent 2 queries, so it is not stub.
- ✗
There is a high packet loss on the network.
Why it's wrong here
Packet loss would cause retransmissions and increased traffic; the numbers are balanced.
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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