Which term refers to interference that distorts signals on a shared medium, such as copper cables?

Which term refers to interference that distorts signals on a shared medium, such as copper cables?

• A. Crosstalk
• B. Collision Domain
• C. Confidentiality
• D. Content Switch

Answer: (A)

The concept here is interference between neighboring conductors on a shared medium, which causes signal distortion. On copper cables, signals travel as electrical waves in one wire, and nearby wires carry their own signals. Because the wires are close together, changing voltages in one pair can induce unwanted voltages in adjacent pairs through capacitive and inductive coupling. This unwanted coupling is called crosstalk, and it distorts the intended signal, potentially causing errors in data transmission. In Ethernet and telephone cabling, crosstalk is a well-known issue, with terms like near-end crosstalk and far-end crosstalk describing where the distortion is observed. Why this term fits best: it specifically describes the unwanted interference between channels on a shared medium, which is what the question is asking about. The other terms don’t capture this phenomenon: a collision domain refers to a network segment where simultaneous transmissions can collide, not to signal distortion between channels; confidentiality is about protecting data from disclosure; and a content switch is a device that routes or distributes traffic. To reduce crosstalk, use properly twisted-pair cables, consider shielding or better separation, keep signal pairs balanced, and ensure good termination practices.

The concept here is interference between neighboring conductors on a shared medium, which causes signal distortion. On copper cables, signals travel as electrical waves in one wire, and nearby wires carry their own signals. Because the wires are close together, changing voltages in one pair can induce unwanted voltages in adjacent pairs through capacitive and inductive coupling. This unwanted coupling is called crosstalk, and it distorts the intended signal, potentially causing errors in data transmission. In Ethernet and telephone cabling, crosstalk is a well-known issue, with terms like near-end crosstalk and far-end crosstalk describing where the distortion is observed.

Why this term fits best: it specifically describes the unwanted interference between channels on a shared medium, which is what the question is asking about. The other terms don’t capture this phenomenon: a collision domain refers to a network segment where simultaneous transmissions can collide, not to signal distortion between channels; confidentiality is about protecting data from disclosure; and a content switch is a device that routes or distributes traffic.

To reduce crosstalk, use properly twisted-pair cables, consider shielding or better separation, keep signal pairs balanced, and ensure good termination practices.