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Prevent Access to the Command Prompt This policy keeps users from getting to the command prompt by turning off the Run command and the MS-DOS Prompt shortcut
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Figure 2313
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This policy defines who may log on to the system This policy defines who may shut down the This policy forces a minimum
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Account Lockout Threshold This policy sets the maximum number of logon attempts a person can make before they are locked out of the account Disable Windows Installer installing software This policy prevents users from
Printer Browsing This policy enables users to browse for printers on the network, as opposed to using only assigned printers
While the CompTIA A+ exams don t expect you to know how to implement policies on any type of network, you are expected to understand that policies exist, especially on Windows networks, and that they can do amazing things in terms of controlling what users can do on their systems If you ever try to get to a command prompt on a Windows system, only to discover the Run command is grayed out, blame it on a policy, not the computer!
Malicious Software
The beauty of the Internet is the ease of accessing resources just about anywhere on the globe, all from the comfort of your favorite chair This connection, however, runs both ways, and people from all over the world can potentially access your computer from the comfort of their evil lairs The Internet is awash with malicious software malware that is even at this moment trying to infect your systems Malware consists of computer programs designed to break into computers or cause havoc on computers The most common types of malware are viruses, worms, spyware, Trojan horses, adware, and grayware You need to understand the different types of malware so you can combat them for you and your users successfully
Viruses
Just as a biological virus gets passed from person to person, a computer virus is a piece of malicious software that gets passed from computer to computer (Figure 2314) A computer virus is designed to attach itself to a program on your computer It could be your e-mail program, your word processor, or even a game Whenever you use the infected program, the virus goes into action and does whatever it was designed to do It can wipe out your e-mail or even erase your entire hard drive! Viruses are also sometimes used to steal information or send spam e-mails to everyone in your address book
Figure 2314
You ve got mail!
23: Computer Security
Trojans
Trojans are true, freestanding programs that do something other than what the person who runs the program thinks they will do An example of a Trojan virus is a program that a person thinks is a game but is actually a CMOS eraser Some Trojans are quite sophisticated It might be a game that works perfectly well, but when the user quits the game, it causes some type of damage
Worms
Similar to a Trojan, a worm is a complete program that travels from machine to machine, usually through computer networks Most worms are designed to take advantage of security problems in operating systems and install themselves on vulnerable machines They can copy themselves over and over again on infected networks, and can create so much activity that they overload the network, in worst cases even bringing chunks of the entire Internet to a halt There are several things you can do to protect yourself and your data against these threats First, make sure you are running up-to-date virus software especially if you connect to the Internet via an always-on broadband connection You should also be protected by a firewall, either as part of your network hardware or by means of a software program (See the sections on antivirus programs and firewalls later in this chapter) Since worms most commonly infect systems because of security flaws in operating systems, the next defense against them is to make sure you have the most current version possible of your operating system and to check regularly for security patches A security patch is an addition to the operating system to patch a hole in the operating system code You can download security patches from the software vendor s Web site (Figure 2315) Microsoft s Windows Update tool is handy for Windows users as it provides a simple method to ensure that your version s security is up to date The one downside is that not everyone remembers to run Windows Update Don t wait until something goes wrong on your computer, or you hear on the news that another nasty program is running rampant across the Internet Run Windows Update weekly (or even better automatically) as a part of your normal system maintenance Keeping your patches up to date is called patch management, and it goes a long way toward keeping your system safe!
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