CompTIA Network+ Practice Test

What does crosstalk (XT) refer to in networking?

1. The interference between wireless signals

2. The leaking of signal from one circuit to another

3. The signal strength of a network connection

4. The process of data encryption in transit

The correct answer is: The leaking of signal from one circuit to another

Crosstalk (XT) in networking refers specifically to the phenomenon where a signal from one circuit or channel interferes with the signal from another circuit or channel. This interference is particularly relevant in communication systems, where multiple signals are being transmitted simultaneously. Crosstalk can lead to degradation of signal quality, resulting in data errors or loss of integrity in communication. In twisted pair cabling, for instance, crosstalk can occur when the electromagnetic fields generated by the transmission of data in one pair of wires induce electrical signals in a neighboring pair. Managing crosstalk is critical in network design to ensure high performance and reliable data transmission. The other options describe different concepts. Interference between wireless signals relates to radio frequency interference but does not encompass the broader definition of crosstalk. Signal strength pertains to the power of a signal rather than its interference aspects, and data encryption in transit is a security measure unrelated to the issue of signal interference.