Final answer:
Fiber-optic cables are immune to electromagnetic interference and have a high bandwidth, enabling them to transmit large amounts of data efficiently.
Step-by-step explanation:
Two characteristics of fiber-optic cable are its immunity to electromagnetic interference and its high bandwidth. Unlike copper wires, fiber-optic cables do not conduct electricity, which means they do not suffer from electromagnetic interference. This makes them ideal for environments with a lot of electrical noise. Additionally, fiber-optic cables have a high bandwidth, allowing them to carry a significantly greater amount of data compared to traditional copper wires. This high bandwidth is crucial for supporting the vast amount of data transmission required for internet communications and telephone conversations.