D
DAC

See Discretionary Access Control (DAC).

data integrity

A quality that provides a level of confidence that data won't be jeopardized and will be kept secret.

Data Link layer

The second layer of the Open Systems Interconnection (OSI) model. It describes the physical topology of a network.

data packet

A unit of data sent over a network. A packet includes a header, addressing information, and the data itself.

data repository

A centralized storage location for data, such as a database.

data source

Where data originates.

datagram

A Layer 3, User Datagram Protocol (UDP) packet descriptor.

DDoS attack

See distributed denial of service (DDoS) attack.

decryption

The process of converting encrypted data back into its original form. ...

Get CompTIA Security+™: Study Guide, Fourth Edition now with O’Reilly online learning.

O’Reilly members experience live online training, plus books, videos, and digital content from 200+ publishers.