350-601 Network Practice Question
A data center architect is designing a spine-leaf network with 40 leaf switches and 8 spine switches. Each leaf has 40x25G downlinks to servers and 8x100G uplinks to spines. The oversubscription ratio from server to spine is calculated as (total downlink bandwidth) / (total uplink bandwidth). What is the oversubscription ratio for each leaf?
⚠ Common exam trap
Cisco often tests the oversubscription calculation by providing link counts and speeds, and the trap here is that candidates may forget to multiply the number of links by their respective speeds before dividing, or they may invert the numerator and denominator.
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
✓
1.25:1
The oversubscription ratio for each leaf is calculated by dividing the total downlink bandwidth by the total uplink bandwidth. Each leaf has 40 downlinks at 25 Gbps each, totaling 1000 Gbps, and 8 uplinks at 100 Gbps each, totaling 800 Gbps. Thus, 1000 / 800 = 1.25, giving a 1.25:1 ratio.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
1.5:1
Why it's wrong here
Incorrect calculation.
- ✗
2:1
Why it's wrong here
Incorrect calculation.
- ✗
0.8:1
Why it's wrong here
Ratio is uplink/downlink inverted.
- ✓
1.25:1
Why this is correct
1000/800 = 1.25:1.
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Senior Network & Security Engineer · founder of Courseiva
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