Question 202 of 1,840
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350-401 Practice Question: Which three statements about EIGRP packet types…
Which three statements about EIGRP packet types are true? (Choose three.)
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
✓
Hello packets are sent unreliably and do not require an acknowledgment.
EIGRP uses five packet types: Hello (neighbor discovery/maintenance), Update (route information), Query (ask neighbors for routes), Reply (response to Query), and ACK (acknowledgment). Hello packets are multicast to 224.0.0.10, unacknowledged, and used to form and maintain adjacencies. Update packets are sent reliably (with ACK) and can be multicast or unicast. Query packets are multicast and require a Reply. ACK packets are unicast and are used to acknowledge reliable packets.
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 packets are sent unreliably and do not require an acknowledgment.
Why this is correct
Correct because Hello packets are sent as best-effort (unreliable) and are not acknowledged.
- ✗
Update packets are always sent as multicast to all EIGRP neighbors.
Why it's wrong here
Incorrect because Update packets can be unicast when responding to a Query or when sending a partial update to a specific neighbor.
- ✓
Query packets are sent reliably and require a Reply from each neighbor.
Why this is correct
Correct because Query packets are reliable (require acknowledgment) and each neighbor must respond with a Reply.
- ✓
ACK packets are unicast and are used to acknowledge reliable EIGRP packets.
Why this is correct
Correct because ACK packets are sent as unicast to acknowledge receipt of reliable packets like Update, Query, and Reply.
- ✗
Reply packets are sent unreliably to conserve bandwidth.
Why it's wrong here
Incorrect because Reply packets are sent reliably (require acknowledgment) to ensure the querying router receives the information.
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 18, 2026
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.
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