mediumMultiple Choice
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 neighbors
EIGRP-IPv4 Neighbors for AS(100) H Address Interface Hold Uptime SRTT RTO Q Seq (sec) (ms) Cnt Num 0 192.168.1.2 Gi0/0 13 00:12:34 12 100 0 45 1 10.1.1.2 Gi0/1 12 00:10:20 15 120 0 32
Based on this output, what can be concluded?
⚠ Common exam trap
Cisco often tests the misconception that the 'show ip eigrp neighbors' output reveals authentication status or metric values, but the table only shows transport-layer reliability statistics and adjacency state, not security or routing metric details.
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
✓
Both neighbors are fully established and exchanging routing information.
The 'show ip eigrp neighbors' output displays two neighbors in a stable state, indicated by the 'Q Cnt' (Queue Count) of 0 for both, meaning no packets are waiting to be sent. The 'Seq Num' (Sequence Number) values (45 and 32) show that R1 has received and processed EIGRP updates from each neighbor, confirming the adjacency is fully established and routing information is being exchanged. This output does not provide any metric or authentication details, so only the conclusion that both neighbors are fully operational is valid.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Both neighbors are using MD5 authentication.
Why it's wrong here
The EIGRP neighbor table command output (show ip eigrp neighbors) does not include any authentication-related fields, such as the key ID or hash algorithm, because authentication is configured under the EIGRP process or interface, not displayed in the neighbor adjacency table. A stable neighbor relationship can exist with or without authentication, and this output offers no evidence to determine whether MD5 or any other authentication method is in use. Therefore, the statement about MD5 authentication is unsupported by the provided data.
- ✗
Neighbor 192.168.1.2 has a higher metric than 10.1.1.2.
Why it's wrong here
The EIGRP neighbor table lists neighbor IP addresses along with hold time, uptime, SRTT, RTO, queue count, and sequence number, but it does not display metric values for routes learned from those neighbors. Metrics are stored and shown in the EIGRP topology table (show ip eigrp topology), which contains the composite metric and vector metrics for each route. Without topology table output, there is no basis to claim that 192.168.1.2 has a higher metric than 10.1.1.2.
- ✓
Both neighbors are fully established and exchanging routing information.
Why this is correct
A Q Cnt (queue count) of 0 means there are no EIGRP packets queued for transmission to the neighbor, indicating that all updates, queries, and replies have been processed and acknowledged, which is characteristic of a fully established adjacency. The presence of a valid, non-zero uptime value for both neighbors confirms that they have successfully completed the initial neighbor discovery and exchange process and are actively exchanging routing information. Thus, the output directly supports the conclusion that both neighbors are fully established and exchanging EIGRP routing information.
- ✗
Router R1 is using EIGRP named mode.
Why it's wrong here
The header 'EIGRP-IPv4 Neighbors for AS(100)' is the format used for classic EIGRP configuration, which is created with the 'router eigrp 100' global configuration command. In named mode (EIGRP named configuration), the output includes VRF and address-family context, such as 'EIGRP-IPv4 Neighbors for VRF(NAME)' or 'EIGRP-IPv4 Neighbors for AS(100) VRF(NAME)' when using address-family configuration. The absence of a VRF or address-family label in the header indicates the router is running classic EIGRP mode, not named mode.
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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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This 350-401 practice question is part of Courseiva's free Cisco certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the 350-401 exam.