What transmission medium is known for having the largest bandwidth?

Fiber-optic cable is known for having the largest bandwidth among the given options. This is primarily due to its use of light to transmit data rather than electrical signals, which allows for much higher transmission rates and wider frequency range. Fiber-optic systems can support extremely high data rates, often exceeding 100 Gbps, and can cover long distances without signal degradation. This capability makes fiber-optic technology ideal for high-speed internet connections and backbone infrastructures.

In comparison, while coaxial and twisted pair cables are widely used for data transmission, they are limited in their bandwidth capacity. Coaxial cables, although better than twisted pair in terms of shielding and distance, still cannot match the immense capacity of fiber optics. Twisted pair cables, including various categories such as CAT 5e or CAT 6, also have lower bandwidth capabilities, making them more suitable for shorter distances and lower speed applications.

Although CAT 7 cable offers improved specifications over earlier twisted pair cables, including higher frequencies and better shielding, it still falls short of matching the bandwidth capacity and performance that fiber-optic cables provide. Thus, fiber-optic technology holds the crown for bandwidth capabilities, making it the correct answer.