One Word: Firewall!
A firewall is a framework intended to keep unapproved access to or from a private system network. You can actualize a firewall in either hardware or programming structure, or a blend of both. Firewalls keep unapproved Internet clients from getting to private systems joined with the Internet, particularly intranets. All messages entering or leaving the intranet (i.e., the network system to which you are joined) must go through the firewall, which inspects every message and obstructs those that don't meet the predefined security criteria. Note: In securin