EXIN EXIN Certifications CDCP Questions & Answers

• Question 61:

  is the ability of a system or component to perform its required functions under stated conditions for a specified period of time.

  A. Scalability

  B. Agility

  C. Reliability

  D. Availability

  Correct Answer: C

  According to the IEEE definition, reliability is the ability of a system or component to perform its required functions under stated conditions for a specified period of time. Reliability is a measure of how often a system or component fails, and how long it takes to recover from a failure. Reliability is closely related to availability, which is the degree to which a system or component is operational and accessible when required for use. Reliability and availability are both affected by factors such as design, maintenance, testing, and environmental conditions.

  References: EPI Data Centre Training Framework, CDCP Preparation Guide, Reliability engineering - Wikipedia

• Question 62:

  systems are designed specifically to protect the structure of a building.

  A. Pro-inert

  B. Inergen

  C. Water sprinkler

  D. Total Flooding

  Correct Answer: C

  Water sprinkler systems are designed to protect the structure of a building from fire by suppressing or extinguishing the flames with water. Water sprinkler systems are typically installed in the ceiling or walls of a building and are activated by heat or smoke detectors. Water sprinkler systems can reduce the risk of fire spreading and causing structural damage to the building.

• Question 63:

  Which of statements below is true?

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

  B. Single-mode cabling is more expensive than multi-mode cabling.

  C. Multi-mode cabling can cross longer distances.

  D. Multi-mode cabling is more expensive than single-mode cabling.

  Correct 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 alignmentand 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.

• Question 64:

  What is the current recommended temperature for ICT equipment as described in the ASHREA TC 9.9 guideline?

  A. 8-18 C (46.4 -64.4 °F)

  B. 20-40 °C (68 - 104 °F)

  C. 18-27 C (64.4 - 80.6°F)

  D. 25-45 °C (77 - 113 °F)

  Correct Answer: C

  The current recommended temperature for ICT equipment as described in the ASHRAE TC 9.9 guideline is 18-27 C (64.4 - 80.6). This is the recommended range for the dry-bulb temperature at the inlet of the servers, which is the most critical parameter for ensuring the optimal performance and reliability of the ICT equipment. The recommended range is based on the thermal specifications of the majority of the ICT equipment in the market, as well as the energy efficiency and environmental considerations of the data centre cooling systems. The recommended range is suitable for Classes A1 to A4 of the ASHRAE thermal guideline classes, which cover different types and generations of ICT equipment.

• Question 65:

  Which one of the following is an Audible Signaling and Notification Device?

  A. Sirens

  B. Strobes

  C. Alarms

  D. Clocks

  Correct Answer: A

  According to the CDCP?Preparation Guide, an audible signaling and notification device is a device that produces a sound to alert or notify the occupants of a data center of an event or condition. Sirens are examples of such devices, as they can emit loud and distinctive tones to warn of fire, emergency, or security incidents. Strobes, on the other hand, are visual signaling and notification devices that produce flashes of light to attract attention or convey information. Alarms and clocks are not specific types of devices, but rather general terms that can refer to various audible or visual devices.

  References: CDCP?Preparation Guide, page 30. Audible Visual Notification | System Sensor | Honeywell. Audible-Visual Signaling Devices - AutomationDirect.

• Question 66:

  What should be considered when implementing hot- or cold-aisle containment in an existing computer room?

  A. Equipment will get too hot at the rear (back) of the rack potentially resulting in more ICT hardware failures.

  B. The delta-T of the equipment will increase too much causing reliability issues.

  C. It creates potential issues with the existing fire suppression system(s).

  D. It will be more difficult to install power and network cabling in the contained area.

  Correct Answer: C

  Hot- or cold-aisle containment is a strategy to improve the cooling efficiency and reduce the energy consumption of data centers by isolating the hot exhaust air from the cold supply air. However, implementing this strategy in an existing

  computer room may create potential issues with the existing fire suppression system(s), such as:

  The containment barriers may interfere with the distribution and activation of the fire suppression agents, such as water, gas, or aerosol, and reduce their effectiveness in extinguishing a fire.

  The containment barriers may create pockets of high temperature and pressure that could damage the equipment or the containment structure itself in the event of a fire.

  The containment barriers may obstruct the access and visibility of the fire detection and alarm devices, such as smoke detectors, heat sensors, or manual call points, and delay the response time of the fire suppression system(s).

  The containment barriers may violate the local fire codes and regulations that specify the minimum clearance and ventilation requirements for the data center.

  Therefore, when implementing hot- or cold-aisle containment in an existing computer room, it is important to consider the impact on the existing fire suppression system(s) and take appropriate measures to ensure the safety and compliance

  of the data center, such as:

  Consulting with the fire authorities and the fire suppression system vendor to assess the compatibility and suitability of the containment solution with the existing fire suppression system(s).

  Modifying or upgrading the existing fire suppression system(s) to accommodate the containment solution, such as relocating or adding fire suppression devices, adjusting the discharge rate and pressure, or installing a secondary fire

  suppression system within the contained area.

  Installing fire-rated containment barriers that can withstand high temperatures and resist the spread of fire and smoke, and that have self-closing or automatic release mechanisms in case of a fire.

  Installing fire detection and alarm devices within the contained area and ensuring their proper integration and communication with the existing fire suppression system(s).

  Conducting regular testing and maintenance of the fire suppression system(s) and the containment solution to ensure their functionality and reliability.

  References: EPI Data Centre Framework, Module 4: Fire Protection, page 10-11. EPI Data Centre Professional (CDCP? Reference Materials, page 66-67. 1, 2, 3.

• Question 67:

  Cost of Downtime can be classified as.

  A. Direct and Indirect

  B. Up and Down

  C. Mean and Median

  D. Classified and Declassified

  Correct Answer: A

  Cost of downtime is the total amount of money lost due to a data centre outage or disruption. It can be classified into two categories: direct and indirect. Direct costs are the immediate and measurable expenses incurred during or after an outage, such as lost revenue, lost productivity, recovery costs, compensation costs, penalties, etc. Indirect costs are the long-term and intangible impacts of an outage, such as reputation damage, customer dissatisfaction, loss of market share, legal liabilities, etc. Both direct and indirect costs can vary depending on the type, duration, and severity of the outage, as well as the industry, size, and location of the data centre.

  References: EPI Data Centre Training Framework EPI Data Centre Competence Framework Understanding the Cost of Data Center Downtime Uptime Institute's 2022 Outage Analysis Finds Downtime Costs and Consequences Worsening [INFOGRAPHIC] The Cost of Downtime: 21 Stats You Need to Know

• Question 68:

  The temperature and humidity values indicated on the display of the Computer room air conditioner unit are the values measured at which point?

  A. It is the average value between the intake and exhaust (outlet) of the air conditioner.

  B. It is the value measured at the intake of the air conditioner.

  C. It is the value measured at the exhaust (outlet) of the air conditioner.

  D. It is the value measured at the front of the rack of the aisle the air conditioner is situated.

  Correct Answer: B

  According to the IBM document on temperature and humidity design criteria, the temperature and humidity values indicated on the display of the computer room air conditioner unit are the values measured at the intake of the air conditioner. This is because the intake is where the air conditioner draws the air from the computer room and cools and dehumidifies it before sending it back to the computer room. The display shows the current conditions of the computer room air, which are used to adjust the cooling and dehumidifying operations of the air conditioner. The values measured at the exhaust (outlet) of the air conditioner are not displayed, as they are not relevant for the computer room environment. The values measured at the front of the rack of the aisle the air conditioner is situated are also not displayed, as they may vary depending on the distance and location of the rack. The average value between the intake and exhaust (outlet) of the air conditioner is not displayed, as it does not reflect the actual conditions of the computer room air or the air conditioner performance.

  References: Temperature and humidity design criteria - IBM

• Question 69:

  What is the purpose of a service corridor?

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

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

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

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

  Correct 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.

  References: EPI Data Centre Training Framework, CDCP Preparation Guide, Service Corridors Definition | Law Insider

• Question 70:

  IP protection grades consist of two numbers.

  Which levels of protection do they describe and what is the best protection?

  A. First digit; protections against the ingress of solid objects. Second digit; protection against ingress of water/fluids. The lower the number the better the level of protection.

  B. First digit; protections against the ingress of solid objects. Second digit; protection against ingress of water/fluids. The higher the number the better the level of protection.

  C. First digit; protections against the ingress of water/fluids. Second digit; protection against ingress of solid objects. The higher the number the better the level of protection.

  D. First digit; protections against the ingress of water/fluids. Second digit; protection against ingress of solid objects. The lower the number the better the level of protection.

  Correct Answer: B

  IP protection grades are a way of showing the effectiveness of electrical enclosures in blocking foreign bodies such as dust, moisture, liquids, and accidental contact. IP stands for Ingress Protection or International Protection, and it is defined by the international standard IEC 60529. IP ratings consist of the letters IP followed by two digits and an optional letter. The first digit indicates the level of protection the enclosure provides against access to hazardous parts and the ingress of solid foreign objects. The second digit indicates the level of protection the enclosure provides against the ingress of water or fluids. The higher the number, the better the level of protection. For example, IP65 means the enclosure is dust-tight and can withstand water jets from any direction. IP68 means the enclosure is dust-tight and can be submerged in water under specified conditions.

  References: EPI Data Centre Training Framework, CDCP Preparation Guide, IP code - Wikipedia, [IP Ratings Explained | Ingress Protection Rating | IP Codes | Updated 2022]