350-601 Network Practice Question
A data center architect is designing a spine-leaf network with 40 leaf switches and 4 spine switches. Each leaf has 48 x 25G server-facing ports and 8 x 100G uplinks to the spines. What is the oversubscription ratio from server to spine?
⚠ Common exam trap
Cisco often tests the oversubscription ratio by providing port counts and speeds, and the trap here is that candidates mistakenly use the number of uplinks (8) as the total uplink bandwidth in Gbps, or incorrectly assume the server ports are 50G or 100G, leading to ratios like 2:1 or 3:1.
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
✓
1.5:1
The oversubscription ratio is calculated by comparing the total server-facing bandwidth to the total uplink bandwidth. Each leaf switch has 48 x 25G server ports = 1200 Gbps of server-facing capacity, and 8 x 100G uplinks = 800 Gbps of spine-facing capacity. The ratio is 1200:800, which simplifies to 1.5:1, meaning the server-facing side has 1.5 times the bandwidth of the uplinks.
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 ratio.
- ✗
3:1
Why it's wrong here
Incorrect ratio.
- ✓
1.5:1
Why this is correct
Correct calculation.
- ✗
4:1
Why it's wrong here
Incorrect ratio.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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