350-601 Network Practice Question
In a spine-leaf architecture with 40 leaf switches and 4 spine switches, each leaf has four 40G uplinks to the spines. What is the oversubscription ratio if each leaf has 48 ports of 10G for servers?
⚠ Common exam trap
Cisco often tests the oversubscription ratio calculation by providing port counts and speeds, and the trap is that candidates mistakenly divide the total server bandwidth by the number of uplinks instead of the total uplink bandwidth, or they forget to multiply the number of uplinks by their speed.
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
✓
3:1
The oversubscription ratio is calculated by comparing total server bandwidth to total uplink bandwidth. Each leaf has 48 ports × 10G = 480G of server-facing bandwidth, and 4 uplinks × 40G = 160G of spine-facing bandwidth. The ratio is 480:160 = 3:1, meaning three times as much server bandwidth as uplink bandwidth, which is a common design target in Cisco ACI and NX-OS spine-leaf fabrics.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
2:1
Why it's wrong here
Incorrect calculation.
- ✗
5:1
Why it's wrong here
Incorrect calculation.
- ✓
3:1
Why this is correct
Correct: 480/160 = 3.
- ✗
4:1
Why it's wrong here
Incorrect calculation.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This 350-601 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 350-601 exam.