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300-410 Practice Question: Runs the following command to troubleshoot an…
A network engineer runs the following command to troubleshoot an Administrative Distance issue:
R1# debug eigrp packets
EIGRP Packets debugging is on (UPDATE, REQUEST, QUERY, REPLY, HELLO, IPXSAP, PROBE, ACK, STUB, SIAQUERY, SIAREPLY)
*Mar 1 00:01:23.456: EIGRP: received UPDATE on GigabitEthernet0/0 nbr 10.1.1.2 *Mar 1 00:01:23.456: AS 100, Flags 0x0, Seq 1/0 idbQ 0/0 iidbQ un/rely 0/0 *Mar 1 00:01:23.456: Int: 192.168.5.0/24, metric 30720/28160 *Mar 1 00:01:23.456: EIGRP: Enqueueing UPDATE on GigabitEthernet0/0 nbr 10.1.1.2 iidbQ un/rely 0/1 peerQ un/rely 0/0 serno 1-1
What does this output indicate?
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 router is receiving an EIGRP update for network 192.168.5.0/24 with a composite metric of 30720/28160.
The debug output shows EIGRP packet exchanges. It does not directly show administrative distance, but it indicates that an update is being sent and received for a specific network.
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 is receiving an EIGRP update for network 192.168.5.0/24 with a composite metric of 30720/28160.
Why this is correct
The debug shows 'received UPDATE' and the metric.
- ✗
The administrative distance for this route is 90 because it is internal.
Why it's wrong here
The debug does not show AD; internal EIGRP routes have AD 90, but this is not confirmed.
- ✗
The router is sending a query for network 192.168.5.0/24.
Why it's wrong here
It is sending an UPDATE, not a query.
- ✗
The EIGRP neighbor relationship is down.
Why it's wrong here
The neighbor is communicating, so the relationship is up.
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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