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Learn data center fundamentals.
Practical explanations of power, cooling, racks, cabling, operations, safety, careers, and interview preparation.
Where to start
Four ways to build your data center knowledge.
Interview Prep
Role-specific questions, answer structures, scenario practice, and red flags for real data center interviews.
Go to the Question BankCareer Paths
How to enter data center roles from IT, electrical, HVAC, facilities, military, or non-traditional backgrounds.
Explore career pathsFundamentals
Power, cooling, redundancy, racks, cabling, operations, and safety explained clearly for people new to the floor.
See the Fundamentals courseGlossary
Plain-English definitions of terms you'll hear in job ads, interviews, and training.
Open the glossaryThe systems
The environment every data center role shares.
Whatever track you're on, the same core systems keep coming up in interviews. The Fundamentals course walks through each one in plain language, and the glossary defines the terms as you go.
From the glossary
Know the language before the interview.
- UPS
- A battery-backed system that carries the electrical load for a short time when utility power drops, holding equipment up until generators start or power returns.
- CRAC
- A room cooling unit that uses a refrigerant compressor to remove heat from the data hall, much like a large, precise air conditioner built for continuous duty.
- Rack unit (U)
- The standard height measurement for rack-mounted equipment. One U is 1.75 inches. A "1U server" takes a single slot; a full rack is commonly 42U or 48U.
- Structured cabling
- A planned, standardized cabling system with defined pathways, labeling, and connection points, so that connections are consistent, documented, and easy to trace.
- N+1
- A redundancy level where there is one spare unit beyond what the load needs. If "N" units are required, the site runs N+1 so any single unit can fail or be serviced without impact.
- Runbook
- A documented set of steps for handling a specific task or situation, so that any qualified technician can carry it out consistently and safely.
Reading is the start. Practice is what gets you ready.
Get 25 free questions to see how the answer frameworks work, or jump straight into the full Question Bank.