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PCM Networking Security Solutions: Anti-Spam & Anti-Virus


Viruses can bring your business to a grind halt. So you need a complete antivirus solution to keep you up and running in the event of a virus outbreak, and to reduce your overall business risk. A comprehensive antivirus solution is essential , because it protects you from viruses before they enter your network, as well as those that come in from client PCs. Remember : a server can easily pass along a virus introduced from a client PC that isn't running antivirus software. But client PCs can transmit viruses without ever reaching a file server. So protecting yourself on both fronts is critical. Viruses come in several different forms. Here are some of the most common…

  • Viruses - A virus is a small piece of software that piggybacks on real programs. For example, a virus might attach itself to a program such as a spreadsheet program. Each time the spreadsheet program runs, the virus runs, too, and it has the chance to reproduce (by attaching to other programs) or wreak havoc.

  • E-mail viruses - An e-mail virus moves around in e-mail messages, and usually replicates itself by automatically mailing itself to dozens of people in the victim's e-mail address book.

  • Worms - A worm is a small piece of software that uses computer networks and security holes to replicate itself. A copy of the worm scans the network for another machine that has a specific security hole. It copies itself to the new machine using the security hole, and then starts replicating from there, as well.

  • Trojan horses - A Trojan horse is simply a computer program. The program claims to do one thing (it may claim to be a game) but instead does damage when you run it (it may erase your hard disk). Trojan horses have no way to replicate automatically.


Do you receive lots of junk email messages from people you don't know? It's no surprise if you do. As more people use email, marketers are increasingly using email messages to pitch their products and services. Some consumers find unsolicited commercial email - also known as "spam" - annoying and time consuming; others have lost money to bogus offers that arrived in their email in-box. Additionally, organizations of all sizes have identified spam as a major problem that reduces worker productivity, can cause major internal network issues and inevitably costs the organization money.

Anti-Spam systems identify spam and prevent it from clogging up your inbox. Different solutions work in different ways, but most share common strategies to solve the problem. Messages are passed through several layers of filters and tests to assure that maximum spam detection is achieved. This is done by comparing messages against DNS black lists, spam word statistics, and a configurable spam phrase list to determine if the message is spam.

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