INTERNET
The Internet is a global system of interconnected computer networks that use the standard Internet protocol suite (TCP/IP) to link several billion devices worldwide. It is a network of networks that consists of millions of private, public, academic, business, and government networks, of local to global scope, that are linked by a broad array of electronic, wireless, and optical networking technologies.
ISP
An Internet Service Provider (ISP) is a company that provides you with access to the Internet, usually for a fee. The most common ways to connect to an ISP are by using a phone line (dial-up) or broadband connection (cable or DSL).
digital subscriber line
The Internet is a global system of interconnected computer networks that use the standard Internet protocol suite (TCP/IP) to link several billion devices worldwide. It is a network of networks that consists of millions of private, public, academic, business, and government networks, of local to global scope, that are linked by a broad array of electronic, wireless, and optical networking technologies.
ISP
An Internet Service Provider (ISP) is a company that provides you with access to the Internet, usually for a fee. The most common ways to connect to an ISP are by using a phone line (dial-up) or broadband connection (cable or DSL).
digital subscriber line
MODEM
Short for modulator - demodulator. A modem is a device or program that enables a computer to transmit data over, for example, telephone or cable lines. Computer information is stored digitally, whereas information transmitted over telephone lines is transmitted in the form of analog waves. A modem converts between these two forms.
Short for modulator - demodulator. A modem is a device or program that enables a computer to transmit data over, for example, telephone or cable lines. Computer information is stored digitally, whereas information transmitted over telephone lines is transmitted in the form of analog waves. A modem converts between these two forms.
WEBSITE
A website, also written as web site, or simply site, is a set of related web pages served from a single web domain. A website is hosted on at least one web server, accessible via a network such as the Internet or a private local area network through an Internet address known as a Uniform resource locator.
WEBPAGE
A webpage is a document, typically written in plain text interspersed with formatting instructions of Hypertext Markup Language (HTML, XHTML). A webpage may incorporate elements from other websites with suitable markup anchors.
A website, also written as web site, or simply site, is a set of related web pages served from a single web domain. A website is hosted on at least one web server, accessible via a network such as the Internet or a private local area network through an Internet address known as a Uniform resource locator.
WEBPAGE
A webpage is a document, typically written in plain text interspersed with formatting instructions of Hypertext Markup Language (HTML, XHTML). A webpage may incorporate elements from other websites with suitable markup anchors.
HOMEPAGE
A home page, index page, or main page is a page on a website. A home page usually refers to:
The initial or main web page of a website, sometimes called the "front page".
WEB PORTAL
A web Portal is a web page, which contains links to other website. When we use search engines (Google, yahoo etc.)a few web pages get opened. These web pages contain links to other website. These pages are called Web Portal. We should understand that a web portal does not contain any information, about any topic. It just suggests some web page to the user, to find the desired information.
DOWNLOADING
Downloading means copying files from remote computer to the local machine. We can also say that it is the process of copying files from server to client. Copying songs or image or any type of text from web is an example of downloading.
UPLODING
To Transmit data from a computer to a network is called uploading if you use a personal computer to log on to a network and want to send files across the network, you most upload the files from your PC to the network.
HTTP
HTTP is known as hypertext Transfer Protocol. HTTP is Used to Transfer and manage the links between one hypertext documents and another on web. While surfing net we open a lot of web pages and other hypertext files containing text images animations graphics, audio videos.
A home page, index page, or main page is a page on a website. A home page usually refers to:
The initial or main web page of a website, sometimes called the "front page".
WEB PORTAL
A web Portal is a web page, which contains links to other website. When we use search engines (Google, yahoo etc.)a few web pages get opened. These web pages contain links to other website. These pages are called Web Portal. We should understand that a web portal does not contain any information, about any topic. It just suggests some web page to the user, to find the desired information.
DOWNLOADING
Downloading means copying files from remote computer to the local machine. We can also say that it is the process of copying files from server to client. Copying songs or image or any type of text from web is an example of downloading.
UPLODING
To Transmit data from a computer to a network is called uploading if you use a personal computer to log on to a network and want to send files across the network, you most upload the files from your PC to the network.
HTTP
HTTP is known as hypertext Transfer Protocol. HTTP is Used to Transfer and manage the links between one hypertext documents and another on web. While surfing net we open a lot of web pages and other hypertext files containing text images animations graphics, audio videos.
FTP
The most popular use of the internet is getting files transferred from one computer to other. The files can be graphic sound file or text file. Most of these file are downloaded using protocol which is file transfer protocol popularly known as FTP.
URL
Web sites and the pages they contain have unique address know as web address. Exact and proper name of any web page address is a URL, Which means Uniform Resource Locator
The most popular use of the internet is getting files transferred from one computer to other. The files can be graphic sound file or text file. Most of these file are downloaded using protocol which is file transfer protocol popularly known as FTP.
URL
Web sites and the pages they contain have unique address know as web address. Exact and proper name of any web page address is a URL, Which means Uniform Resource Locator
Protocol Server File
Name Name Name
ELECTRONIC MAIL
E-mail is a Electronic mail provides to be the biggest asset in sending and receiving message instantly from one computer to another. It allows you to quickly communicate with the people around the word any time. Ordinary postal mails are very slow. They are known sent Mails. E- mail are economical and cost just like a local phone call. The same message you can send to more than 100 people with same cost of local phone call.
VIDEO CONFERENCING
It involves the use of video cameras connected to two or more computer. Images and sounds are then sent through the internet where users not only hear each other but can have face to face conversation with each other on the internet. This technology is mainly used for virtual meetings among a group of people to discuss political business medical and social affairs.
E- BANKING
Name Name Name
ELECTRONIC MAIL
E-mail is a Electronic mail provides to be the biggest asset in sending and receiving message instantly from one computer to another. It allows you to quickly communicate with the people around the word any time. Ordinary postal mails are very slow. They are known sent Mails. E- mail are economical and cost just like a local phone call. The same message you can send to more than 100 people with same cost of local phone call.
VIDEO CONFERENCING
It involves the use of video cameras connected to two or more computer. Images and sounds are then sent through the internet where users not only hear each other but can have face to face conversation with each other on the internet. This technology is mainly used for virtual meetings among a group of people to discuss political business medical and social affairs.
E- BANKING
E- Banking stands for electronic banking. This is the way of perforating bank transaction using internet. A customer can do number of things using E- banking such as he can check the amount in his account, make FD( Fixed Deposit) Transfer the money apply for loans make the payment of bills etc. These transaction can be done from any part of the world provide you have internet connection on your computer.
WEB BROWSER
Short for Web browser, a browser is a software application used to locate, retrieve and display content on the World Wide Web, including Web pages, images, video and other files.
WEB SERVER
Web servers are computers that deliver (serves up) Web pages. Every Web server has an IP address and possibly a domain name. For example, if you enter the URL http://www.pcwebopedia.com/index.html in your browser, this sends a request to the Web server whose domain name is pcwebopedia.com. The server then fetches the page named index.html and sends it to your browser.
WEB BROWSER
Short for Web browser, a browser is a software application used to locate, retrieve and display content on the World Wide Web, including Web pages, images, video and other files.
WEB SERVER
Web servers are computers that deliver (serves up) Web pages. Every Web server has an IP address and possibly a domain name. For example, if you enter the URL http://www.pcwebopedia.com/index.html in your browser, this sends a request to the Web server whose domain name is pcwebopedia.com. The server then fetches the page named index.html and sends it to your browser.
WORLD WIDE WEB
The term WWW refers to the World Wide Web or simply the Web. The World Wide Web consists of all the public Web sites connected to the Internet worldwide, including the client devices (such as computers and cell phones) that access Web content. The WWW is just one of many applications of the Internet and computer networks.
The World Web is based on these technologies:
The term WWW refers to the World Wide Web or simply the Web. The World Wide Web consists of all the public Web sites connected to the Internet worldwide, including the client devices (such as computers and cell phones) that access Web content. The WWW is just one of many applications of the Internet and computer networks.
The World Web is based on these technologies:
- HTML - Hypertext Markup Language
- HTTP - Hypertext Transfer Protocol
- Web servers and Web browsers
URL stands for Uniform Resource Locator. A URL is a formatted text string used by Web browsers, email clients and other software to identify a network resource on the Internet. Network resources are files that can be plain Web pages, other text documents, graphics, or programs.
TCP (Transmission Control Protocol)TCP (Transmission Control Protocol) is a set of rules (protocol) used along with the Internet Protocol (IP) to send data in the form of message units between
IP (INTERNET PROTOCOL)IP (Internet Protocol) is the primary network protocol used on the Internet, developed in the 1970s. On the Internet and many other networks, IP supports unique addressing for computers on a network.
CLIENT/SERVERClient/server describes the relationship between two computer programs in which one program, the client, makes a service request from another program, the server, which fulfills the request.For example, to check your bank account from your computer, a client program in your computer forwards your request to a server program at the bank. That program may in turn forward the request to its own client program that sends a request to a database server at another bank computer to retrieve your account balance. The balance is returned back to the bank data client, which in turn serves it back to the client in your personal computer, which displays the information for you.
CLIENT/SERVERClient/server describes the relationship between two computer programs in which one program, the client, makes a service request from another program, the server, which fulfills the request.For example, to check your bank account from your computer, a client program in your computer forwards your request to a server program at the bank. That program may in turn forward the request to its own client program that sends a request to a database server at another bank computer to retrieve your account balance. The balance is returned back to the bank data client, which in turn serves it back to the client in your personal computer, which displays the information for you.
E-mail Short for electronic mail, e-mail or email is text messages that may contain files, images, or other attachments sent through a network to a specified individual or group of individuals. The first e-mail was sent by Ray Tomlinson in 1971.
LAN
A local area network (LAN) is a computer network that interconnects computers within a limited area such as a home, school, computer laboratory, or office building, using network media.
MAN
A metropolitan area network (MAN) is a network that interconnects users with computer resources in a geographic area or region larger than that covered by even a large local area network (LAN) but smaller than the area covered by a wide area network (WAN).
WAN
A wide area network (WAN) is a network that covers a broad area (i.e., any telecommunications network that links across metropolitan, regional, national or international boundaries) using leased telecommunication lines.
Network topology
Network topology is the arrangement of the various elements (links, nodes, etc.) of a computer network. Essentially, it is the topological structure of a network, and may be depicted physically or logically.
1. STAR TOPOLOGY
LAN
A local area network (LAN) is a computer network that interconnects computers within a limited area such as a home, school, computer laboratory, or office building, using network media.
MAN
A metropolitan area network (MAN) is a network that interconnects users with computer resources in a geographic area or region larger than that covered by even a large local area network (LAN) but smaller than the area covered by a wide area network (WAN).
WAN
A wide area network (WAN) is a network that covers a broad area (i.e., any telecommunications network that links across metropolitan, regional, national or international boundaries) using leased telecommunication lines.
Network topology
Network topology is the arrangement of the various elements (links, nodes, etc.) of a computer network. Essentially, it is the topological structure of a network, and may be depicted physically or logically.
1. STAR TOPOLOGY
2. BUS TOPOLOGY
3. RING TOPOLOGY
4. MESH TOPOLOGY
computer virus:
A virus is a program created by the programmers which is used to infect the operation of a computer system. After the virus code is written an existing program, and once that is loaded into the computer the replicates by attaching copies of itself to others programs in the system. Viruses are merely found in the network environment.
QUICK HEAL ANTI VIRUS
AVAST ANTI VIRUS
KESPER SKY ANTI VIRUS
MCAFEE ANTI VIRUS
PANDA ANTI VIRUS
K7 ANTI VIRUS
NORTAN ANTIVIRUS
NOD-32 ANTI VIRUS
GUARDIAN ANTI VIRUS
ETC.
A virus is a program created by the programmers which is used to infect the operation of a computer system. After the virus code is written an existing program, and once that is loaded into the computer the replicates by attaching copies of itself to others programs in the system. Viruses are merely found in the network environment.
QUICK HEAL ANTI VIRUS
AVAST ANTI VIRUS
KESPER SKY ANTI VIRUS
MCAFEE ANTI VIRUS
PANDA ANTI VIRUS
K7 ANTI VIRUS
NORTAN ANTIVIRUS
NOD-32 ANTI VIRUS
GUARDIAN ANTI VIRUS
ETC.
HYPERLINKS: During the development of hyperlink should typically appear at the end of a page. The hyperlinks should appear in blue underline type. Because on the web the blue text conventionally signifies a hyperlink.
Ctrl +K
BASICS OF A WEB PAGES AND WEB SITE DESIGN :
A web site should contain information about the business for which it is being designed. The in formation can be in the form of text, graphics, Photos and multimedia but is not always necessary.
SUB- PAGES: It the user click any of the icon in the navigation bar, the user jumps from the current page to the new page.
Ctrl +K
BASICS OF A WEB PAGES AND WEB SITE DESIGN :
A web site should contain information about the business for which it is being designed. The in formation can be in the form of text, graphics, Photos and multimedia but is not always necessary.
SUB- PAGES: It the user click any of the icon in the navigation bar, the user jumps from the current page to the new page.
ADCA, PGDCA, O LEVEL
Guided Media
Twisted pair cable
A twisted pair cable consists of a pair of insulated conductors that are twisted together. The advantage of a twisted pair cable over the Two wire open lines are it provided better resistance from false noise signals. As the two Wires are close to each other both pick equal interface causes by irrelevant signal sources and this reduces the differential signal add by the noise.
Guided Media
Twisted pair cable
A twisted pair cable consists of a pair of insulated conductors that are twisted together. The advantage of a twisted pair cable over the Two wire open lines are it provided better resistance from false noise signals. As the two Wires are close to each other both pick equal interface causes by irrelevant signal sources and this reduces the differential signal add by the noise.
Coaxial Cable
Consist of a solid conductor running co-axial in side a solid or braided our annular conductor. The space between the two conductor is field with a dielectric insulating material larger the cable diameter, lower is the transmission loss, and higher transmission loss, and higher transfer speeds can be achieved A Co-axial cable can be used over a distance of about 1 km an can achieves a transfer rate of up to 100 MBPS.
Consist of a solid conductor running co-axial in side a solid or braided our annular conductor. The space between the two conductor is field with a dielectric insulating material larger the cable diameter, lower is the transmission loss, and higher transmission loss, and higher transfer speeds can be achieved A Co-axial cable can be used over a distance of about 1 km an can achieves a transfer rate of up to 100 MBPS.
Fiber – Optic cables
This carrier signals in the form of fluctuating light in a glass or plastic cable. An optical fiber cable consists of a glass or plastic core surrounded by a cladding of a similar material but with a lower refractive index. The core transmit the light while the change in refractive index between the core and the cladding causes total internal reflection, thus minimizing the loss of light from fiber.
This carrier signals in the form of fluctuating light in a glass or plastic cable. An optical fiber cable consists of a glass or plastic core surrounded by a cladding of a similar material but with a lower refractive index. The core transmit the light while the change in refractive index between the core and the cladding causes total internal reflection, thus minimizing the loss of light from fiber.
Wireless
Radio, Microwaves’ & Satellite channels use electromagnetic broadcast in open space. It is less expensive than the wired installation. The differentiation between radio microwave & satellite channels lie in the frequencies in which they operate. Frequency bellow 1000 MHZ are radio frequency & higher the microwave frequency.
Radio, Microwaves’ & Satellite channels use electromagnetic broadcast in open space. It is less expensive than the wired installation. The differentiation between radio microwave & satellite channels lie in the frequencies in which they operate. Frequency bellow 1000 MHZ are radio frequency & higher the microwave frequency.