2.1.2+Networks+KEY+TERMS+(y1)

toc For each term below, contribute a unique idea (a definition, an example, an image, a link to an article about the term, embed a video, or other information/media that helps us understand the term. Put 4 ~ next to your contribution so we know who added what.1239686162
 * Networks Key Terms**

LAN
> http://en.wikipedia.org/wiki/Local_area_network > 1240627704
 * local area network: a local computer network for communication between computers 1240140678
 * The characteristics of a LAN, compared to a WAN, are that LANs usually have higher data-transfer rates, smaller geographic place, and lack of a need for leased telecommunication lines.

WAN
> 1240627704
 * A data network extending a LAN (local area network) outside its building, over telecommunication lines or wirelessly, to link to other LANs over 1240140678
 * WAN is a Wide Area Network that covers a broad area.


 * CLIENT**
 * A client is an application or system that accesses a remote service on another computer system, known as a server, by way of a network.1240140678
 * An example could be Web browsers, which are clients that connect to web servers and retrieve web pages for display. 1240628607

SERVER
> 1240628607
 * A server is a computer that handles requests for data, email, file transfers, and other network services from other computers (ie, clients) 1240140678
 * Every action taken by a normal Internet user requires one or more interactions with one or more servers. Example of a server based network:[[image:untitled.PNG]]

ETHERNET
> 1240629250
 * A very common method of networking computers in a Local Area Network or LAN. Ethernet will handle about 10,000,000 bits-per-second and can be used with almost any kind of computer. 1240140678
 * Ethernet devices attach to a common medium that provides a path along which the electronic signals will travel. Today the most commonly used medium is a twisted pair or fiber optic cabling. Example of a small Ethernet Network:

ACCESS

 * the operation of reading or writing stored information 1240140951
 * the ability to read or write data governed by file system permissions. 1240637329
 * Most modern file systems have methods of administering permissions or access rights to specific users and groups of users. These systems control the ability of the users affected to view or make changes to the contents of the file system. http://en.wikipedia.org/wiki/File_system_permissions 1240637329

ACCESS PERMISSIONS

 * Features that control access to shared resources in Windows XP Professional.1240140951
 * Most modern file systems have methods of administering permissions or access rights to specific users and groups of users. These systems control the ability of the users affected to view or make changes to the contents of the file system. http://en.wikipedia.org/wiki/File_system_permissions 1240637329

LOGIN
>
 * 1. The account name used to gain access to a computer system 2. The act of entering into a computer system. In computer security, login (logging or signing in) is the process by which individual access to a computer system is controlled by identification 1240140951
 * An example of a Log in page (http://en.wikipedia.org/wiki/Login): 1240637329

PASSWORD

 * A secret word used to gain admittance or to gain access to information; A string of characters used to log in to a computer or network, to access 1240140951
 * Passwords are often used to control access to protected computer operating systems, mobile phones, automated teller machines (ATMs) and so on. 1240638028

FIREWALL
> 1240638028
 * A firewall is an integrated collection of security measures designed to prevent unauthorized electronic access to a networked computer system. 1240140951
 * Example of the function of a Firewall (http://www.novajo.ca/firewall.jpg):

SYSADMIN

 * A system administrator, systems administrator, or sysadmin, is a person employed to maintain and operate a computer system and/or network. System administrators may be members of an information technology department. 1240140951
 * The duties of sysadmins are usually installing, supporting, and maintaining servers. They are also responsible for the security of systems and backups. 1240639111

UPS

 * Uninterrupted Power Supply. A backup battery module attached to a computer that allows memory contents to remain intact long enough for the operating system to perform an orderly system shutdown if a power outage occurs. 1240140951
 * A UPS is typically used to protect computers, data centers, telecommunication equipment or other electrical equipment so that data loss and injuries are avoided. 1240639111

EDI

 * Electronic Data Interchange: the computer-to-computer exchange of structured information, by agreed message standards, from one computer 1240140951
 * EDI save businesses and companies money by providing an alternative to information flows, which needs a great deal of human interaction and materials such as paper documents, meetings, faxes, etc. 1240639111