350-601 Practice Question: In a spine-leaf architecture, what is the primary…
This 350-601 practice question tests your understanding of 350-601 exam topics. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
In a spine-leaf architecture, what is the primary advantage of using a full mesh between spines and leaves?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "primary"
Why it matters: Asks for the main purpose or function, not a secondary benefit. Eliminate answers that describe side-effects or partial functions.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
It provides uniform low-latency paths between any two leaves
A full mesh where every leaf connects to every spine provides any-to-any connectivity, low latency (all paths are single hop), and high bandwidth with ECMP. It simplifies routing and provides predictable performance. It does not reduce the number of ports (it increases ports), and it does not eliminate the need for VLANs or STP in the underlay (though often STP is not needed due to routing).
Key principle: A trunk being up does not mean the VLAN is allowed across it. Always verify the allowed VLAN list and whether the VLAN exists on both switches.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✓
It provides uniform low-latency paths between any two leaves
Why this is correct
Each leaf is one hop from any spine, ensuring low latency.
Clue confirmation
The clue word "primary" in the question point toward this answer.
Related concept
Access ports place end devices into a single VLAN.
✗
It reduces the total number of ports required
Why it's wrong here
Full mesh increases port count.
✗
It removes the requirement for Spanning Tree Protocol
Why it's wrong here
STP may still be used in some cases, but routing often avoids loops.
✗
It eliminates the need for VLANs in the data center
Why it's wrong here
VLANs are still used for tenant separation.
Common exam traps
Common exam trap: an active trunk can still block the VLAN you need
A trunk being up does not prove every VLAN is crossing it. Check allowed VLAN lists, native VLAN mismatch, VLAN existence and access-port assignment.
Detailed technical explanation
How to think about this question
VLAN questions usually combine access-port and trunking clues. The key is to identify whether the issue is local to one switchport, caused by the trunk, or caused by the VLAN not existing where it needs to exist.
KKey Concepts to Remember
Access ports place end devices into a single VLAN.
Trunk ports carry multiple VLANs between switches.
Allowed VLAN lists decide which VLANs can cross a trunk.
Native VLAN mismatch can create confusing symptoms.
TExam Day Tips
→Use show vlan brief to verify access VLANs.
→Use show interfaces trunk to verify trunk state and allowed VLANs.
→Do not treat every same-VLAN issue as a routing problem.
Key takeaway
A trunk being up does not mean the VLAN is allowed across it. Always verify the allowed VLAN list and whether the VLAN exists on both switches.
Real-world example
How this comes up in practice
A help-desk technician troubleshoots why a newly connected PC cannot reach shared printers on the same floor. The cable is good, the switch port is active, but the PC is in VLAN 20 and the printers are in VLAN 10. The uplink trunk only allows VLAN 10. A trunk being up does not mean every VLAN crosses it.
What to study next
Got this wrong? Here's your next step.
Review VLAN allowed lists, native VLAN mismatch detection, and how to verify VLAN membership with show vlan brief and show interfaces trunk. Then practise related 350-601 questions on switching, trunking, and access-port configuration.
Access ports place end devices into a single VLAN.
What is the correct answer to this question?
The correct answer is: It provides uniform low-latency paths between any two leaves — A full mesh where every leaf connects to every spine provides any-to-any connectivity, low latency (all paths are single hop), and high bandwidth with ECMP. It simplifies routing and provides predictable performance. It does not reduce the number of ports (it increases ports), and it does not eliminate the need for VLANs or STP in the underlay (though often STP is not needed due to routing).
What should I do if I get this 350-601 question wrong?
Review VLAN allowed lists, native VLAN mismatch detection, and how to verify VLAN membership with show vlan brief and show interfaces trunk. Then practise related 350-601 questions on switching, trunking, and access-port configuration.
Are there clue words in this question I should notice?
Yes — watch for: "primary". Asks for the main purpose or function, not a secondary benefit. Eliminate answers that describe side-effects or partial functions.
What is the key concept behind this question?
Access ports place end devices into a single VLAN.
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