Security testing conducted from inside the organization's security perimeter. Response:

Internal Security Testing, also known as internal penetration testing or vulnerability assessment, involves simulating an attack from a threat actor who has already gained access to the internal network. This type of testing helps identify vulnerabilities and weaknesses that could be exploited by insiders or by external attackers once they breach the outer perimeter.

Application Security Testing focuses on the security of specific software applications, regardless of the network location from which the testing is performed.

Web Security Testing specifically targets web applications and services, which can be internal or external.

Software Security Testing is a broad category that encompasses various methods applied to software, not exclusively testing from within a perimeter.