NETWORK SERVICES generally have a wide variety of security-related features and options. These of course include Apache; Squid; the Berkeley Internet Name Domain (BIND); mail transfer agents (MTAs) such as sendmail, Sendmail, and Postfix; Voice over IP (VoIP) services such as Asterisk; the Common Unix Printing System (CUPS); and the Network Time Protocol (NTP). While every service is a potential target for attack, those that are exposed on the Internet, commonly web servers and name servers, for instance, require additional considerations to protect them.
An extensive array ...
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