In a perfect world, information security practitioners would have an unlimited security budget to 
troubleshoot and fix security vulnerabilities. But, as you will learn, you don’t need an unlimited budget to get a quality product. Here are five freeware tools recommended by SearchSecurity.com expert Michael Cobb, that can not only help you tighten up your network security but keep your budget in tact.
Nmap (Network Mapper)
Nessus
Microsoft Baseline Security Analyzer & Windows Server Update Services
Benchmark Tools
OpenSSH Five freeware tools for mitigating network vulnerabilities
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