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300-410 Practice Question: Which EIGRP packet type is used to confirm…
Which EIGRP packet type is used to confirm receipt of an update during reliable transport in a VRF-Lite configuration?
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
✓
ACK
EIGRP uses ACK packets, which are hello packets with no data, to acknowledge reliable packets (updates, queries, replies).
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Hello
Why it's wrong here
Hello packets are used for neighbor discovery and keepalive, not specifically for acknowledgments.
- ✗
Update
Why it's wrong here
An Update packet carries routing information and is itself the payload that requires reliable delivery, not the mechanism that confirms receipt. In EIGRP’s reliable transport, the recipient must send an explicit ACK packet (a Hello with no data) to acknowledge the Update; the Update packet cannot serve as its own acknowledgement because reliable transport demands a separate, non-data-bearing confirmation. This option is tempting because Update packets are the primary means of propagating route changes, and in a non-reliable context they would be the correct choice for distributing VRF-Lite prefixes.
- ✓
ACK
Why this is correct
ACK packets are used to acknowledge receipt of reliable EIGRP packets.
- ✗
Query
Why it's wrong here
Query packets are used to ask neighbors for routing information during convergence.
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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