Internet, Intranets, and Extranets

firewall

a security system consisting of a combination of hardware and software that limits the exposure of a computer or computer network to attack from crackers most commonly used type of security device in an organization's perimeter network

internet

like a big spiderweb that connects computers, devices and smaller networks all around the world

intranet

private computer network within an organization access is limited by permissions set by that organization enables a way for ppl to share resources privately and securely some connected to internet; some are not some have different access levels

extranets

private intranets extended to authorized users outside the organization

perimeter network

small physical or virtual sub-network that is set up between a company's private local area network (LAN) & untrusted networks such as the internet often a physical structure that supports the logical extranet concept that was previously covered allows users outside of a company LAN to access specific services located on that perimeter network