Firewall is a network security system that monitors and controls the incoming and outgoing network traffic based on predetermined security rules.A firewall typically establishes a barrier between a trusted, secure internal network and untrusted outside network, such as the Internet.
A computer security audit is a manual or systematic measurable technical assessment of a system or application. Manual assessments include interviewing staff, performing security vulnerability scans, reviewing application and operating system access controls, and analyzing physical access to the systems.
Email security refers to the collective measures used to secure the access and content of an email account or service. It allows an individual or organization to protect the overall access to one or more email addresses/accounts.