CompTIA A+® Complete Deluxe Study Guide:Exams 220-701 (Essentials) and 220-702 (Practical Application)

H

half-duplex communication

Communications that occur when only one entity can transmit or receive at any one instant.

hard disk drive

A disk drive that contains magnetically coated platters in a sealed case and is often used as the main secondary-storage medium.

hardening

The process of reducing or eliminating weaknesses, securing services, and attempting to make your environment immune to attacks.

header

In hardware, a technology-specific connector on a circuit board for cabling an internal peripheral device to the board. In software, protocol-specific control information added to the original data or to the protocol data unit from the next-higher protocol in the stack. Information attached to the beginning of a network data frame. ...