Which medium is commonly used for Ethernet networks?

• A. Ethernet
• B. Two-wire
• C. Coaxial
• D. Shielded

Answer: (A)

Ethernet networks are defined by a family of standards that can run over several physical media. The term Ethernet describes the overall network standard and signaling, not a single cable type. Among the options, this is the best fit because it names the underlying technology itself rather than a specific cable type. While coaxial cables have been used for some older Ethernet variants and shielded or two-wire descriptions refer to cable properties rather than a standard, the Ethernet designation covers the variety of media that can carry Ethernet signals. In practice, modern Ethernet commonly uses unshielded twisted pair and, for higher speeds or longer distances, fiber, but the standard itself remains Ethernet.