Networks have to be protected from hackers, malicious attack and other unauthorised access.
Firewalls, perimeter security and intrusion detection systems are essential to any enterprise security system to prevent unauthorised access. Know who users are Allowing access through the firewall to known personnel is required if business communication is to use the Internet effectively. The management of these connections forms a major part of the enterprise security policy. Don't say anything Using the public Internet for business communications, browsing, e-mailing, establishing Intranets or extranets all expose data to threat. Only by encrypting connections can data be guaranteed to be kept secret.