Diver down flag. A diver down flag, or scuba flag, is a flag used on the water to indicate that there is a diver below. Two styles of flag are in use. Internationally, the code flag alfa/alpha, which is white and blue, is used to signal that the vessel has a diver down and other vessels should keep well clear at slow speed.
Familiarize yourself with some friendly network cables and take a closer look at common types of network media, including twisted-pair cable, coaxial cable, fiber-optic cable, and wireless.
The following sections discuss the types of cables used in networks and other related topics. 1  Unshielded Twisted Pair (UTP) Cable. 2  Shielded Twisted Pair (STP) Cable. 3  Coaxial Cable.  Fiber Optic 1  Cable. Cable Installation Guides.  Wireless 1  LANs. Unshielded Twisted Pair (UTP)  Cable.