The answer is higher bandwidth utilization through multiple equal-cost paths, along with predictable, consistent latency. This is correct because spine-leaf architecture creates a full-mesh topology where every leaf switch connects to every spine switch, ensuring that traffic between any two leafs traverses at most one spine hop. This design eliminates the oversubscription and variable hop counts found in traditional three-tier topologies, allowing all available paths to be used simultaneously via ECMP (Equal-Cost Multi-Path) routing. On the ENCOR 350-401 exam, this concept tests your understanding of modern data center fabric design, often appearing in questions that contrast spine-leaf with legacy core-aggregation-access models. A common trap is assuming spine-leaf primarily reduces cost or simplifies cabling, when its core benefit is actually deterministic latency and full bandwidth utilization. Remember the mnemonic “One Hop, Full Chop” — every flow takes exactly one spine hop, so you chop all bandwidth equally.
350-401 Architecture Practice Question
This 350-401 practice question tests your understanding of architecture. 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.
Which TWO are benefits of using a spine-leaf architecture in a data center? (Choose two.)
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Predictable latency between any two devices
A is correct because spine-leaf architecture ensures that every leaf switch is connected to every spine switch, creating a full-mesh topology. This design guarantees that traffic between any two leaf switches traverses at most one spine hop, resulting in predictable, consistent latency regardless of which devices are communicating.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✓
Predictable latency between any two devices
Why this is correct
Traffic always traverses one spine hop, resulting in consistent latency.
Related concept
Read the scenario before looking for a memorised answer.
✗
Increased number of single points of failure
Why it's wrong here
Spine-leaf eliminates single points of failure if redundant spines and leaves are used.
✗
Increased broadcast domain size
Why it's wrong here
Spine-leaf typically uses Layer 3 at spine, reducing broadcast domains.
✗
Reduced need for VLANs
Why it's wrong here
VLAN usage is not directly reduced; it's a design choice.
✓
Higher bandwidth utilization through multiple equal-cost paths
Why this is correct
ECMP across multiple spines allows better bandwidth utilization.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the misconception that spine-leaf eliminates VLANs or reduces broadcast domains, but the architecture actually uses Layer 3 routing to contain broadcast domains while still requiring VLANs for Layer 2 segmentation at the leaf level.
Detailed technical explanation
How to think about this question
Under the hood, spine-leaf relies on Equal-Cost Multi-Path (ECMP) routing, typically using OSPF or BGP, to load-balance traffic across all available spine links. In a real-world scenario, this allows a data center to scale horizontally by adding more leaf or spine switches without redesigning the network, while maintaining consistent sub-millisecond latency for east-west traffic.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
TExam Day Tips
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
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.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this 350-401 question in full detail.
Architecture — This question tests Architecture — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Predictable latency between any two devices — A is correct because spine-leaf architecture ensures that every leaf switch is connected to every spine switch, creating a full-mesh topology. This design guarantees that traffic between any two leaf switches traverses at most one spine hop, resulting in predictable, consistent latency regardless of which devices are communicating.
What should I do if I get this 350-401 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
About these practice questions
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These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. Which TWO of the following are benefits of implementing a spine-leaf architecture in a data center?
easy
✓ A.Provides predictable latency for east-west traffic.
B.Eliminates the need for spanning-tree protocol.
C.Reduces the amount of cabling required.
✓ D.Simplifies scalability by adding leaf switches without redesign.
E.Eliminates the need for firewall appliances.
Why A: In a spine-leaf architecture, every leaf switch connects to every spine switch, creating a full mesh topology. This design ensures that any east-west traffic (server-to-server) traverses exactly one spine hop, providing consistent and predictable latency regardless of which leaf switches the source and destination are connected to.
Last reviewed: Jun 11, 2026
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