Describe the purpose a security perimeter. This is the boundary between the outer limit of an organization’s security and the beginning of the outside world. It is the level of security that protects all internal systems from outside threats.
Relate that the security perimeter does not protect against internal attacks from employee threats or on-site physical threats.
Explain that the key components of the security perimeter are firewalls, DMZs, proxy servers, and IDPSs.