Exin Updated CDCP Exam Questions and Answers by zayyan

According to the Certified Data Centre Professional (CDCP®) Reference Materials, the height of 1 "U" (rack unit) or "RU" (rack unit) is standardized at 1.75 inches, which is equivalent to 44.45 millimeters or 4.445 centimeters. This unit of measurement is globally used to define the internal mounting space in IT and telecommunications racks. Equipment manufacturers specify their devices’ height based on how many “U” the device occupies (for example, a 2U server is 3.5 inches high). The standardization ensures interoperability and planning efficiency within the data center environment.

The "U" (rack unit) system is essential for ensuring that racks and equipment from different manufacturers will fit together properly, facilitating modularity, expansion, and maintenance. The 1.75-inch specification is defined by several industry standards including EIA-310 and is referenced directly in the EPI CDCP training and its official exam preparation guides.

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 equipment1. 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 crashes23. 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 testing14.

According to the CDCP Preparation Guide1, risk can be defined as the product of impact and probability. Impact is the measure of the negative consequences or losses that may result from a risk event, such as downtime, data loss, or damage to the data centre. Probability is the measure of the likelihood or frequency of a risk event occurring, based on historical data, expert judgment, or statistical analysis. By multiplying impact and probability, risk can be quantified and compared, which helps in prioritizing and mitigating the risks. For example, a risk event that has a high impact but a low probability may have the same risk level as a risk event that has a low impact but a high probability.

For safety and emergency egress, doors should swing outwards (towards the exit). This is a common building code and best practice in data centers.