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What a DNS Server Is and How It Works   What is a DNS server ?   Domain Name Server (s) (DNS) are the Internet’s equivalent of a phone book. They maintain a directory of domain names and translate them to Internet Protocol (IP) addresses. A DNS server runs special-purpose networking software, features a public IP address, and contains a database of network names and addresses for other Internet hosts.     Fig: DNS Server DNS Root Servers DNS servers communicate with each other using private network protocols. All DNS servers are organized in a hierarchy. At the top level of the hierarchy, so-called root servers store a complete database of Internet domain names and their corresponding IP addresses. The Internet employs 13 root servers that have become somewhat famous for their special role. Maintained by various independent agencies, the servers are aptly named A, B, C and so on up to M. Ten of these servers reside in the ...

How to create Undeletable & Unrenameable Folder in Windows Step:1 Open cmd prompt with administrator right, then go to the path where you want to create Undeleable and Unnameable folder. Step:2 Then type "mkdir con\". Your folder is created at the your desired location. It is impossible to rename and delete by user. so enjoy with it. Step:3 For delete the folder again go to same location by cmd prompt and type "rmdir con\" and your folder is deleted.

How to Set a Custom Logon Screen Background on Windows 7   Enabling Custom Backgrounds: Step:1 Launch the Registry Editor by typing regedit into the search box in the Start menu and pressing Enter. Step:2 In the Registry Editor, navigate to the following key: HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Authentication\LogonUI\Background Step:3 You’ll see a DWORD value named OEMBackground. If you don’t see it, right-click in the right pane, point to the New submenu, and create a new DWORD value with this name. Double-click the OEMBackground value and set its value to 1.   Step:4 Changing the setting in group policy will allow it to persist even when you change your theme, but the Group Policy Editor is only available in Professional editions of Windows. If you have access to the Group Policy Editor, launch gpedit.msc from the Start menu.   Step:5 Navigate to the following section in the Group Policy Editor windo...