Exin CDCP Exam Practice Test Instant Access

Question 1

Which Class of Fires involves energized electrical equipment?

AClass A

BClass B

CClass C

DClass K

Answer : C

Class C fires involve energized electrical equipment, such as computers, servers, switches, cables, and wiring. These fires require the use of non-conductive extinguishing agents, such as carbon dioxide, dry chemical, or clean agent, to prevent electrical shock and damage to the equipment. Water-based extinguishers, such as Class A or K, are not suitable for Class C fires, as water can conduct electricity and cause electrocution or short circuits.

Question 2

Which one of the following is a device that uses circulating chilled water to remove heat?

AComputer Room Air Handling Unit (CRAH)

BComputer Room Air System Unit (CRAS)

CComputer Room Air Suspension Unit (CRAS)

DComputer Room Air Suppression Unit (CRAS)

Answer : A

A computer room air handling unit (CRAH) is a device that uses circulating chilled water to remove heat from the data center environment. A CRAH consists of a fan, a coil, and a filter. The fan draws the warm air from the data center and passes it through the coil, where the heat is transferred to the chilled water. The chilled water is supplied by a chiller or a cooling tower, and the cooled air is returned to the data center. A CRAH is different from a computer room air conditioning unit (CRAC), which uses a refrigerant instead of chilled water to cool the air.

* EPI Data Centre Professional (CDCP) Preparation Guide, page 36

* Chilled Water Systems: Applications and Common Uses

* The Principles of Basic Refrigeration: What is a chiller?

Question 3

The expected time to Recover/Repair from a system from a failure is defined as .

AMTBF

BMCBF

CMLBF

DMTTR

Answer : D

The expected time to recover or repair from a system from a failure is defined as MTTR (mean time to recovery or mean time to repair). MTTR is the average time it takes to restore a system or product to its normal operation after a failure. MTTR includes the time spent on detecting, diagnosing, and fixing the problem. MTTR is an important metric for measuring the reliability and availability of a system or product, as well as the efficiency and effectiveness of the incident management process. A lower MTTR indicates a faster and more reliable recovery or repair process.

* EPI Data Centre Professional (CDCP) Preparation Guide, page 17

* What is MTTR? | IBM

* Explained: All Meanings of MTTR and Other Incident Metrics

Question 4

Which type of Fire Detection Device is recommended for protecting a Data Center?

AHeat detector

BSmoke detector

CFlame detector

DNone of the above

Answer : B

According to the CDCP Preparation Guide, smoke detectors are the most common type of fire detection devices used in data centers, as they can detect a fire in its early stages and provide early warning to the occupants and authorities. Smoke detectors can be either spot-type or air-aspirating, depending on the design and goals of the data center. Spot-type detectors are inexpensive and simple, but may cause activation delay and false alarms. Air-aspirating detectors are more sensitive and reliable, but may require more maintenance and installation costs. Both types of detectors should be installed in accordance with the relevant standards and codes, such as NFPA 72 and EN 54.

Question 5

What should be taken into consideration when using patch cables?

AThe patch cable should always be the same of a lower class the structured cable.

BThe patch cable should always be the same or a higher class the structured cable.

CPatch cables can only be used in combination with flat patch panels.

DPatch cables can only be used in combination with angled patch panels.

Answer : B

Patch cables of a lower class than the structured cabling can degrade the overall link performance, so it is best practice to use the same or higher class.

CDCP Exam Preparation Guide, Cabling

Question 6

What is the purpose of a service corridor?

ATo create a secure and conditioned environment where media can be stored in a controlled manner.

BIt is a generic name for pathways leading to other rooms that contains facility supporting equipment like the UPS room, battery room, generator room etc.

CIt provides a safe, vented and secure area where standby generators can operate safely.

DIt provides a secure area where supporting facilities can be serviced and monitored on a 24x7 basis without disturbing the computer room.

Answer : D

A service corridor is a dedicated space within or adjacent to a data centre that allows access to the supporting facilities, such as power, cooling, fire suppression, security, and cabling systems, without interfering with the computer room operations. A service corridor helps to isolate the noise, vibration, heat, and dust generated by the supporting facilities from the sensitive equipment in the computer room. A service corridor also enhances the safety and efficiency of the maintenance and monitoring activities, as well as the flexibility and scalability of the data centre design.

Question 7

Which of statements below is true?

ASingle-mode cabling can use both LED and laser as a light source.

BSingle-mode cabling is more expensive than multi-mode cabling.

CMulti-mode cabling can cross longer distances.

DMulti-mode cabling is more expensive than single-mode cabling.

Answer : B

Single-mode cabling and multi-mode cabling are two types of fiber optic cables that differ in their core diameter, wavelength, light source, bandwidth, distance, and cost. Single-mode cabling has a smaller core diameter and uses a laser as a light source, which enables it to transmit data over longer distances and higher bandwidths. However, single-mode cabling is also more expensive than multi-mode cabling, because it requires more precise alignment and splicing, and more costly light sources and connectors. Multi-mode cabling has a larger core diameter and uses LEDs or VCSELs as a light source, which makes it cheaper and easier to install and maintain. However, multi-mode cabling also has a shorter distance and lower bandwidth than single-mode cabling, because it suffers from more modal dispersion and attenuation.

1: Data Center Cabling: Single Mode vs Multimode Fibers2, page 1, section 1 3: Single Mode vs Multimode Fiber Cable Guide4, page 1, section 1 5: Single-Mode vs. Multi-Mode Fiber Cables: Explained6, page 1, section 1 7: 2 Types of Fiber Optic Cable: Single Mode vs. Multimode Fiber8, page 1, section 1

Exin CDCP Certified Data Centre Professional Exam Practice Test