EXIN EXIN-CDCP Online Practice Questions and Exam Preparation

EXIN EXIN-CDCP Online Questions & Answers

• Question 61:

  An optical fiber cable comes with the specifications 50/125 um.

  What do the numbers represent?

  A. The first number represents the distance for a 10 Gb/s connection; the second number represents the
  B. distance for a 1 Gb/s connection.
  C. The first number represents the diameter of the core; the second number represents the diameter ofthe cladding in microns.
  D. The first number represents the diameter of the core; the second number represents the actual diameter cable including the buffer and jacket.
  E. The first number represents the required distance to single-phase power cabling; the second number represents the required distance to three-phase cabling.
  B. distance for a 1 Gb/s connection.

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  Explanation

  Optical fiber cables are composed of a core, a cladding, and a coating. The core is the central part of the fiber that carries the light signal. The cladding is the layer surrounding the core that reflects the light back into the core and prevents signal loss. The coating is the protective layer that covers the cladding and provides mechanical strength and environmental protection. The specifications of an optical fiber cable indicate the dimensions of the core and the cladding in microns (m), which are one millionth of a meter.

  For example, a 50/125 m cable has a core diameter of 50 m and a cladding diameter of 125 m. The coating diameter is usually 250 m, but it is not part of the specifications.

• Question 62:

  What is a potential risk when using floor mounted cool air ducting systems?

  A. The neighboring racks could have a potential cooling impact.
  B. There are no risks when using floor mounted cool air ducting systems.
  C. Using floor mounted cool air ducting systems will increase the Computer room relative humidity.
  D. Using floor mounted cool air ducting systems will increase the Computer room temperature
  A. The neighboring racks could have a potential cooling impact.

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  Explanation

  Floor mounted ducting can cause uneven cooling, potentially leading to overcooling or undercooling of adjacent racks, which affects performance and reliability.

  References:

  CDCP Exam Preparation Guide, Cooling

• Question 63:

  Which one of the following is a factor that can affect Availability and Reliability?

  A. Inadequate Cooling
  B. Employee Salaries
  C. Radio Active Waves
  D. Attenuation
  A. Inadequate Cooling

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  Explanation

  Availability and reliability are two important aspects of data centre performance that measure how often the system is operational and how dependable it is. According to the EPI Data Centre Framework, availability is the percentage of time that a system or component is in an operable state, while reliability is the probability that a system or component will perform its required function under given conditions for a specified period of time. Both availability and reliability can be affected by various factors, such as design, maintenance, human error, power supply, security, etc. One of the factors that can have a significant impact on both availability and reliability is cooling. Cooling is essential for maintaining the optimal temperature and humidity levels for the IT equipment and preventing overheating, which can cause failures, downtime, and reduced lifespan.

  Inadequate cooling can result from insufficient capacity, poor airflow management, faulty components, or environmental conditions. Inadequate cooling can reduce the availability and reliability of the data centre by increasing the risk of thermal stress, hot spots, performance degradation, and equipment damage.

  Therefore, cooling is a critical factor that can affect availability and reliability in a data centre.

• Question 64:

  Which type of Humidifier suspends quartz lamps over an open pool of water?

  A. Infrared Humidifiers
  B. Water Canister Humidifier
  C. Steam Canister Humidifier
  D. Ultrasonic Humidifier
  A. Infrared Humidifiers

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  Explanation

  Infrared humidifiers are a type of humidifier that use quartz lamps to heat water in an open pool and evaporate it into the air. They are energy-intensive and require frequent maintenance and cleaning. They are not recommended for data centers, as they can introduce contaminants and bacteria into the air, and increase the risk of fire and electrical hazards.

  References:

  EPI Data Centre Training Framework, CDCP Preparation Guide, Make Humidification Adjustments | ENERGY STAR

• Question 65:

  is the arithmetic mean of time between the failing and the subsequent running of the system in a particular time period.

  A. MTBF
  B. MCBF
  C. MLBF
  D. MTTR
  A. MTBF

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  Explanation

  MTBF stands for Mean Time Between Failures, and it is the arithmetic mean of time between the failing and the subsequent running of the system in a particular time period. MTBF is a measure of reliability that indicates how often a system or component fails during its operation. MTBF can be calculated by dividing the total operating time by the number of failures over a given period. For example, if a system operates for 1000 hours and experiences 5 failures, the MTBF is 1000/5 = 200 hours.

• Question 66:

  A new water-bearing pipe is proposed above an equipment area.

  Which response most effectively reduces facility risk?

  A. Accept the route because the pipe is outside the cabinets
  B. Paint the pipe a warning color and take no other action
  C. Assess alternative routing and provide suitable containment and detection
  D. Move only the lowest-value equipment beneath the pipe
  C. Assess alternative routing and provide suitable containment and detection

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  Explanation

  Avoiding exposure is preferable, and remaining exposure should be controlled through containment and early detection. Warning paint or equipment value alone does not prevent water from reaching operational systems.

• Question 67:

  Can Electro Magnetic Fields (EMF) cause data centre failures?

  A. Yes, high levels of EMF can cause data centre failures.
  B. No, only power issues will cause data centre failures.
  C. No, only cooling issues will cause data centre failures.
  D. Yes, but only EMF caused by lightning strikes.
  A. Yes, high levels of EMF can cause data centre failures.

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  Explanation

  According to the EPI Data Centre Training Framework, EMF is a form of electromagnetic interference (EMI) that can disrupt or damage the normal operation of electronic devices, such as servers, network cables, and IT equipment 1. High levels of EMF can be generated by power equipment, cell phones, microwaves, TV and radio signals, etc., and can cause data corruption, data loss, system malfunction, and crashes.

  Therefore, EMF can cause data centre failures and affect the availability, performance, and security of the data centre. To prevent or mitigate EMF, data centres should follow the best practices for data centre design, layout, cabling, grounding, shielding, and testing

• Question 68:

  What is the best practice for cutting holes in the raised floor tile?

  A. Anywhere as data centre tiles are designed to allow cut-outs anywhere.
  B. Draw a cross on the tile and when making a cut-out do not touch a line and avoid the corners.
  C. Draw a line in the middle of the tile and never touch the line when making the cut.
  D. Cut the tiles at the corner so the pedestals can be used as a vertical cable manager.
  B. Draw a cross on the tile and when making a cut-out do not touch a line and avoid the corners.

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  Explanation

  According to the Raised Floor Installation Manual, the best practice for cutting holes in the raised floor tile is to draw a cross on the tile and when making a cut-out do not touch a line and avoid the corners. This ensures that the structural integrity and load-bearing capacity of the tile are not compromised. Cutting holes anywhere, touching the line, or cutting the corners can weaken the tile and cause it to crack or collapse.

  Additionally, the manual recommends using a drill press or a reciprocating saw with a metal or bi-metal cutting blade, and deburring all sharp edges.

• Question 69:

  What factor should be considered when placing fluorescent lighting in the data centre?

  A. Fluorescent lights should not be connected to the back-up generator.
  B. Fluorescent lights should only be installed in equipment supporting areas and not in the Computer/ Server room.
  C. Fluorescent lights should not be connected to the mains power supply.
  D. Fluorescent lights should not be connected to the same UPS that supports the ICT equipment.
  D. Fluorescent lights should not be connected to the same UPS that supports the ICT equipment.

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  Explanation

  The UPS (uninterruptible power supply) is a device that provides backup power to the ICT equipment in case of a power outage or a power quality issue. The UPS should be dedicated to the ICT equipment only, and not to other loads, such as lighting, cooling, or security systems. This is because connecting fluorescent lights to the same UPS as the ICT equipment can cause several problems, such as:

  1. Reducing the battery runtime of the UPS, which may not be enough to support the ICT equipment until the backup generator kicks in or the utility power is restored.

  2. Increasing the harmonic distortion of the UPS output, which can affect the performance and reliability of the ICT equipment and the UPS itself.

  3. Creating electromagnetic interference (EMI) or radio frequency interference (RFI), which can disrupt the communication and data transmission of the ICT equipment.

  4. Triggering false alarms or tripping the circuit breakers of the UPS, which can cause downtime or data loss.

  5. Therefore, fluorescent lights should not be connected to the same UPS that supports the ICT equipment.

  Instead, they should be connected to a separate power source, such as the utility power, the backup generator, or a different UPS.

• Question 70:

  The termination of the ability of a product to perform its required function can be defined as.

  A. Failure
  B. Termination
  C. Hindrance
  D. Obstacle
  A. Failure

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  Explanation

  According to the EPI Data Centre Professional (CDCP? Preparation Guide, failure is defined as "the termination of the ability of a product to perform its required function" (page 9). Failure can occur due to various reasons, such as wear and tear, design flaws, human errors, environmental factors, or external events. Failure can affect the availability, reliability, and performance of a product, system, or service.