Which of the following cable types is unshielded?

STP (Shielded Twisted Pair) includes a metallic foil or braided shield around the wire pairs to reduce EMI.

Twinax cable is a shielded cable type used in short-range high-speed connections such as Direct Attach Copper for 10GbE.

UTP (Unshielded Twisted Pair) cable relies solely on the twist ratio of the wire pairs to reduce electromagnetic interference, containing no metallic shielding layer. It is the most widely used cable type in Ethernet LANs due to its low cost and flexibility. Its lack of shielding is explicitly part of its name and specification.

Coaxial cable has a central conductor surrounded by a metallic shield, making it a shielded cable type.