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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 a reliable update?
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 reliable transport for updates, queries, and replies. The receiver sends an ACK packet (a Hello packet with no data) to confirm receipt.
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 serve neighbour discovery and keepalive functions, not reliable transport confirmation. Reliable EIGRP updates require an ACK packet to acknowledge receipt; Hello packets lack the sequence-number tracking mechanism that ACKs use to confirm delivery. The temptation arises because Hello packets are the most frequent EIGRP packet type and are involved in forming adjacencies, so one might assume they handle all control-plane acknowledgements. In a scenario requiring only neighbour maintenance or dead-interval detection, Hello would be the correct choice.
- ✓
ACK
Why this is correct
Correct. ACK packets are used to acknowledge reliable EIGRP packets (updates, queries, replies).
- ✗
Update
Why it's wrong here
Incorrect. Update packets carry routing information and are sent reliably.
- ✗
Reply
Why it's wrong here
Incorrect. Reply packets respond to queries and are sent reliably.
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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