Certified Data Centre Professional (CDCP) Practice Exam 2025 - Free CDCP Practice Questions and Study Guide

Shielded twisted pair (STP) cable is indeed effective for preventing electromagnetic interference (EMI). The design of STP incorporates a foil shield around the individual wire pairs, which helps to block external interference. This shielding provides a barrier that can significantly reduce the impact of noise from external sources, such as electrical equipment or radio frequency interference, making it more reliable for transmitting data without degradation.

The twisting of the pairs also plays a critical role in minimizing crosstalk and further enhances the cable's ability to reject EMI. Because both the twist and the shielding work together, STP is widely used in environments where interference is a concern, offering a robust solution for maintaining signal integrity.

While other options suggest limitations of STP, the effectiveness of this cable type is well recognized across various applications and distances, not just limited to short runs or high-frequency scenarios. This makes STP a versatile choice for ensuring the reliability of data transmission in environments with potential electromagnetic interference.