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INTRO TO OSI Model      [ Open Systems Interconnection ] In the early 1980s , the development of networks was chaotic. Each vendor had its own proprietary solution(PC). The bad part was that one vendor’s solution(PC) was not compatible with another vendor’s solution (PC) ex. IBM and Microsoft both are developing they own standard so only Microsoft can communicate with Microsoft computer and IBM can communicate with IBM computer. This is where  I nternational Organization for Standardization (ISO) come in action and ISO  developed an Open model called OSI Model ( Open System Interconnection ) ,OSI comes with a Layering approach to the network or hardware vendors would design hardware for network, and others could develop software for the application for this hardware or network. Using an open model which everyone agrees so means we can build a network that is compatible with each other.        The OSI Model is a conceptual Model...

    Vulnerability Databases NVD  – US National Vulnerability Database CERT  – US Computer Emergency Readiness Team OSVDB  – Open Sourced Vulnerability Database Bugtraq  – Symantec SecurityFocus Exploit-DB  – Offensive Security Exploit Database Fulldisclosure  – Full Disclosure Mailing List MS Bulletin  – Microsoft Security Bulletin MS Advisory  – Microsoft Security Advisories Packet Storm  – Packet Storm Global Security Resource SecuriTeam  – Securiteam Vulnerability Information CXSecurity  – CSSecurity Bugtraq List Vulnerability Laboratory  – Vulnerability Research Laboratory ZDI  – Zero Day Initiative Vulners  – Security database of software vulnerabilities