Cheat sheet
EXIN CDCP Cheat Sheet
Standards + Site
- 20% of exam
- Uptime Tiers TIA-942 Rated EN 50600 ISO 22237 Mission Critical
Power Infrastructure
- 20% of exam
- UPS Topology Generators ATS/STS Redundancy Grounding
Cooling Infrastructure
- 20% of exam
- ASHRAE TC 9.9 CRAC/CRAH Hot/Cold Aisle Free Cooling Liquid Cooling
Facilities + Security
- 25% of exam
- Raised Floor Fire Suppression Clean Agents Physical Security Structured Cabling
Operations + Efficiency
- 15% of exam
- SOP/MOP/EOP Commissioning PUE/WUE/CUE Maintenance BCDR
Quick Facts
- Exam CDCP
- Credential Data Centre Pro
- Time 60 min
- Pass 68% (27/40)
- Questions 40 MCQ
- Format Closed book
- Validity 3 years
- Blueprint 85/15
Tier Availability ST
- I=671 | II=741 | III=982 | IV=995
- I: no redundancy II: N+1 III: concurrent IV: fault tolerant
Tier III vs IV ST
Tier III
- Concurrent maintain
- N+1 minimum
- Single fault survive
Tier IV
- Fault tolerant
- 2N active-active
- Multiple faults
- Maintain vs tolerate
Tier Picker ST
- 99.67% ok → Tier I ( No redundancy )
- Need N+1 → Tier II ( Power+cooling red )
- Concurrent maintain → Tier III ( 2N or N+1 )
- Fault tolerant → Tier IV ( 2N active-active )
- 99.995% SLA → Tier IV ( Highest )
- Cost constrained → Tier I ( Basic )
Uptime Tiers ST
- Tier I N: 99.671%
- Tier II N+1: 99.741%
- Tier III Concurrent: 99.982%
- Tier IV Fault tolerant: 99.995%
- Concurrent Maintain without shutdown
- Fault Tolerant Survives single failure
Standards + Rated ST
- TIA-942 US telecom standard
- EN 50600 European DC standard
- ISO 22237 Intl DC standard
- Rated-1 Basic; no redundancy
- Rated-4 Highest; 2N active
- Uptime Tier Operational; not TIA
Redundancy Ladder PO
- N | N+1 | 2N | 2(N+1)
- N: none N+1: one extra 2N: full duplicate 2(N+1): dual+extra
AC vs DC Power PO
AC
- Standard delivery
- Transformable
- Generator native
DC
- No conversion loss
- Battery native
- HVDC emerging
- Utility vs battery
UPS Topology Picker PO
- Basic office → Offline ( No conditioning )
- Small server → Line-interactive ( AVR boost )
- Data centre → Double-conversion ( Zero transfer )
- Cost sensitive → Line-interactive ( Mid tier )
- Mission critical → Double-conversion ( Online VFI )
- Transfer <4ms → Double-conversion ( No break )
Power Distribution PO
- UPS Uninterruptible supply
- PDU Power distribution unit
- ATS Auto transfer switch
- STS Static transfer switch
- Generator Backup power source
- SRG Signal ref grounding
- EPO Emergency power off
ATS vs STS PO
ATS
- Mechanical switch
- Utility-gen transfer
- Seconds
STS
- Static electronic
- Sub-cycle transfer
- Millisecond
- Mechanical vs static
Redundancy Schemes PO
- N No redundancy
- N+1 One extra unit
- 2N Full duplicate
- 2(N+1) Dual system + extra
- Concurrent Maintain one path
- Catch N+1 common bus risk
CRAC vs CRAH CO
CRAC
- Direct expansion
- Refrigerant coil
- Compressor
CRAH
- Chilled water
- Water coil
- No compressor
- DX vs water
Cooling Method Picker CO
- Low density → CRAC/CRAH ( Perimeter )
- High density → In-row ( Close to rack )
- Rear door → RDHx ( Passive )
- Mild climate → Air-side ( Free cooling )
- Extreme density → Immersion ( Liquid )
- Chip direct → Direct-to-chip ( Cold plate )
Cooling Systems CO
- CRAC Direct-expansion AC
- CRAH Chilled water coil
- In-row Rack-adjacent cooling
- RDHx Rear door heat exch
- Hot Aisle Exhaust containment
- Cold Aisle Intake containment
- Economizer Free cooling source
Cooling Methods CO
- Air-side Outside air economizer
- Water-side Cooling tower economizer
- Adiabatic Evaporative cooling
- Immersion Fluid submersion
- Direct-to-chip Cold plate liquid
- ASHRAE A1 18-27 °C envelope
Fire Classes FA
- A=solid | B=liquid | C=electrical | D=metal
- A: paper/wood C: live electrical D: combustible metal
Raised Floor vs Slab FA
Raised Floor
- Air + cable
- Access below
- Load limit
Slab
- Overhead tray
- No floor plenum
- Higher load
- Under vs over
Fire Protection FA
- NFPA 75 IT equipment standard
- VESDA Early smoke detect
- FM-200 HFC-227ea clean agent
- Novec 1230 FK-5-1-12 agent
- IG-541 Inergen; inert gas
- Water Mist Fine droplet suppress
- Pre-action Double-interlock sprinkler
FM-200 vs Novec 1230 FA
FM-200
- HFC-227ea
- GWP high
- Phase-out pressure
Novec 1230
- FK-5-1-12
- GWP low
- Sustainable
- HFC vs FK
Physical Security FA
- Mantrap Two-door interlock
- Biometric Fingerprint/iris scan
- CCTV Surveillance cameras
- IDS Intrusion detection sys
- Perimeter Outer fence layer
- Access Card Badge entry control
- Layered Perimeter to rack
Structured Cabling FA
- MDA Main dist area
- HDA Horizontal dist area
- EDA Equipment dist area
- ZDA Zone dist area
- OM3/OM4 Laser-optimised fibre
- OM5 Wideband multimode
- Cat 6A 10GBase-T copper
Building + Auxiliary FA
- Raised Floor Air + cable distribution
- Slab Overhead cable tray
- Load Floor kN/m² rating
- BMS Building mgmt sys
- EPMS Env power monitoring
- DCIM DC infra management
- EMF Magnetic field shielding
DC Lifecycle OP
- Design | Build | Operate | Decommission
- Design: plan Build: construct Operate: run Decommission: retire
SOP vs MOP OP
SOP
- Standard procedure
- What to do
- Routine task
MOP
- Method of procedure
- How to do
- Step-by-step
- What vs how
Operations Procedures OP
- SOP Standard op procedure
- MOP Method of procedure
- EOP Emergency op procedure
- AOR Auth ops report
- SLA Service level agmt
- OLA Operational level agmt
- Cx Level Commissioning 1-5
Efficiency Metrics OP
- PUE=Total/IT | WUE=Water/IT | CUE=Carbon/IT
- PUE: lower better DCiE=1/PUE ISO 30134
Efficiency + BCDR OP
- PUE Total/IT power
- WUE Water/IT energy
- CUE Carbon/IT energy
- DCiE 1/PUE efficiency
- RTO Recovery time objective
- RPO Recovery point objective
- ISO 30134 Resource efficiency KPIs
Common Traps
Tier vs Rated
- Uptime = operational ≠ TIA-942 = facility
ATS vs STS
- ATS mechanical ≠ STS static sub-cycle
CRAC vs CRAH
- CRAC = DX compressor ≠ CRAH = chilled water
N+1 vs 2N
- N+1 = one extra ≠ 2N = full duplicate
PUE direction
- Lower is better ≠ 1.0 = ideal
Raised floor load
- Check kN/m² ≠ Not just tile size
Last Minute
- 1. Tiers: I/II/III/IV avail
- 2. N+1 vs 2N redundancy
- 3. Double-conversion = online UPS
- 4. ASHRAE: 18-27 °C
- 5. PUE = Total/IT (lower)
- 6. VESDA + clean agent
- 7. MDA/HDA/EDA cabling
- 8. SOP/MOP/EOP procedure
- 9. Cx levels 1-5; IST pull-plug
- 10. 3-year validity; recertify
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