A Vulnerability Assessment Services detects of vulnerabilities in existing systems, subsequent decisions and remedial actions, e.g. software patches. This assessment service determines the nature of security vulnerabilities, which exist on the network as well as hosts, and methods of mitigation. The assessment covers network equipment like routers, switches, firewalls etc. and Operation systems like Windows NT, Solaris and Linux. This activity is usually performed by executing tool-based scans on network and hosts within the client’s internal network.