security system

nouns

(computing) a system that enforces boundaries between computer networks
domain category
the branch of engineering science that studies (with the aid of computers) computable processes and structures
is a type of (narrower)
instrumentality that combines interrelated interacting artifacts designed to work as a coherent entity
"he bought a new stereo system"; "the system consists of a motor and a small computer"
an electrical device that sets off an alarm when someone tries to break in