350-601 Network Practice Question
A network engineer is designing a spine-leaf fabric with oversubscription ratio 3:1. Each leaf switch has 48x10G host-facing ports and 4x40G uplinks to spines. What is the oversubscription ratio per leaf?
⚠ Common exam trap
Cisco often tests the oversubscription calculation by providing port counts and speeds, and the trap here is that candidates may incorrectly sum the uplink bandwidth (e.g., 4x40G = 160G) but then divide host bandwidth by the number of uplinks instead of total uplink bandwidth, or confuse oversubscription with the ratio of host ports to uplink ports.
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 per leaf is calculated by dividing the total host-facing bandwidth by the total uplink bandwidth. Each leaf has 48x10G host ports (480G total) and 4x40G uplinks (160G total). 480G / 160G = 3:1, matching the design target.
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.
- ✗
4:1
Why it's wrong here
Incorrect calculation.
- ✓
3:1
Why this is correct
Correct: 480/160 = 3.
- ✗
1.2:1
Why it's wrong here
Incorrect calculation.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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