Which cable sends data as light?

Fibre optic cables are often used for WANs because ....

The inner part of the optical fibre which carries light is called

Optical fibers suffer radiation losses at bends or curves on their paths. State true or false.

It is a piece of hardware with multiple ports that helps organize a group of cables.

These are clearly defined boundaries where one entity hands off a connection to another. For example, when Xfinity hands off the Internet to a customer.