• Resolver Cache – Linux vs Windows

    Microsoft Windows OS’ have a resolver cache built into the actual OS.  Most Windows admins already know this.  When your Windows system performs a DNS query the results are stored by the OS and are available for use by other applications and processes running on the system.  This means that you can resolve www.itdojo.com to its IP address using Firefox and then open a command prompt and ping www.itdojo.com without your system performing a new DNS query in support of the ping.  The ping command will use the cached entry stored by the OS.  For Windows systems you can view and control (somewhat) this using these commands: