WLANs Terrestrial microwave — Terrestrial microwave communication uses Earth-based transmitters and receivers resembling satellite dishes. Terrestrial microwaves are in the low gigahertz range, which limits all communications to line-of-sight.
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 Network hardware essay 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" Network hardware essay 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. Never give out your real name, address, city, telephone number, or other identifying information to a stranger in a chat room, computer bulletin board, or other public place.
Obviously, this simple solution has disadvantages.
I wouldn't get many clients if I used an alias like "CyberRocket" or "Wolverine" at my website. That having been said, it is worthwhile to alert people to the existence of phishing.
People first encounter phishing when they receive a fraudulent e-mail that typically purports to be from a bank, credit card company, or other financial institution.
The e-mail might mention something about your account is suspended until you "verify", "update", or "validate" some information. The e-mail invites you to click on a link in the e-mail.
The link typically takes you to a webserver located in a foreign country and operated by criminals, who display webpages with the logo and trademarks of a bank, credit card company, or government agency, which makes the webpage appear legitimate.
It is trivial for people familiar with HTML and webbrowsers to download some webpages from a legitimate financial institution, make some changes to the text, then upload those bogus webpages to a criminal's webserver. The bogus webpages really do appear legitimate because much of each bogus webpage is an exact copy of the real institution's webpage.
The bogus webpage asks you to supply your account numbers, passwords, and other personal information e. Citibank has been a popular target for phishers.Introduction This essay contains a description of several famous malicious computer programs (e.g., computer viruses and worms) that caused extensive harm, and it reviews the legal consequences of each incident, including the nonexistent or lenient punishment of the program's author.
A wireless network is a computer network that uses wireless data connections between network nodes.. Wireless networking is a method by which homes, telecommunications networks and business installations avoid the costly process of introducing cables into a building, or as a connection between various equipment locations.
Wireless telecommunications networks are generally implemented and. Network computer can help organization to maintain the central control over computing, linking PCs, workstations, peer-to-peer, or other computers through the internet or .
Computer hardware as a system of input, processing, output, storage, and control components. Thus a computer system consists of input and output devices, primary and secondary storage devices, the central processing unit, the control unit within the CPU, and other peripheral devices.
A hierarchical network is preferred with the trunk at the top and the hosts at the bottom. We will write a custom essay sample on Network Hardware specifically for you for only $ $/page.
Essay: Network Hardware.
Describe in your own words the important functions performed by following hardware commonly found in a network. Include a diagram (draw this yourself) indicating where these devices would be found in a network.