Final answer:
A Vulnerability scanner is used by administrators to check for known issues in systems that may be exploited by attackers. These tools automatically scan for vulnerabilities and provide reports with remediation steps.
Step-by-step explanation:
An administrator would use a Vulnerability scanner to check systems for known issues that attackers may use to exploit the systems. Vulnerability scanners are specialized tools designed to assess computers, networks, or applications for known weaknesses. These tools can perform automated scans of a system to detect vulnerabilities such as outdated software, misconfigurations, and security patches that have not been applied. They provide detailed reports that include recommendations for how to address each found vulnerability, thus allowing administrators to secure systems against potential attacks.