Thus, computing includes designing and building hardware and software systems for a wide range of purposes; processing, structuring, and managing various kinds of information; doing scientific studies using computers; making computer systems behave intelligently; creating and using communications and entertainment media; finding and gathering information relevant to any particular purpose, and so on.
Files with such dangerous double file extensions are executable programs perhaps malicious programs that are pretending to be a picture, a document, text, or a webpage.
Such mistakes in English text in an e-mail apparently from a native speaker of English should alert the reader to the possibility of e-mail from a forged address, which may contain a malicious program.
Firewall It is good practice to erect a "firewall" between parts of a computer system that an external user can access e. Many hackers run programs that randomly search the Internet and probe ports on computers that are connected to the Internet. Worse, hackers may also hijack the victim's computer and use it to launch their illegal attacks on other computers.
Some hackers randomly search the Internet, probing ports controlled by a malicious program called SubSeven.
When the hacker finds a computer that contains SubSeven and is not protected by a firewall, the hacker can access the victim's computer through the backdoor provided by SubSeven. That statistic convinced me that firewall software is prudent on every computer connected to the Internet.
This dramatic increase in the number of attempts per hour to access my computer shows that the Internet is becoming a more dangerous place and that firewall software is necessary for a secure computer.
The cost of having a separate computer that is dedicated solely to receiving incoming modem connections and requests from the Internet i. For example, this document that you are reading was obtained via the Internet from a computer in Pittsburgh, which provides webhosting service, for which I pay a monthly fee.
Here are some hints about how to make a computer secure from incoming commands: Set terminal emulator software so that the modem either never answers an incoming telephone call or answers on the 99th ring and also connect a telephone answering machine to the modem's line to pick up on the fourth ring, so there is never a 99th ring.
Do not install any software that allows even an authorized user to access the computer remotely, via a modem. The state-of-the-art analog modem in i. The cable or DSL service is always connected to the Internet, unlike the modem on an ordinary voice-grade telephone line.
Cable or DSL makes a user more vulnerable to intrusions by hackers in two different ways: The static IP address allows a hacker to return to the victim's computer, once the hacker has found that victim's computer has no firewall or an ineffective firewall.
If a computer is on all the time, hackers have continuous access to that computer, since cable or DSL is always connected to the Internet.
For these reasons, firewall software is more essential if one uses either cable television or DSL for an Internet connection. Avoiding harassment For casual on-line activities, you can establish a free e-mail account at Yahoo, HotMail, or some other provider, and use an alias for that account.
If someone harasses or stalks you, then you simply close that account and chose another alias. In other words, you adopt a disposable identity for your life in cyberspace.The ability to control the information one reveals about oneself over the internet, and who can access that information, has become a growing concern.
Course Description This foundational course covers local area network topics including rationale for networking, the open systems interconnection (OSI) model, common network topologies and architecture, client/server concepts, basic hardware devices and usage, and basic networking security concepts.
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