| What is ISDN ? ISDN is Integrated Services Digital Network. You can make a dial up connection to your ISP through ordinary telephone lines or special ISDN lines. ISDN lines are about two or three times faster than ordinary telephone lines. ISDN is telephone wire technology that allows digital data transmission to coexist with analoge pathways. With ISDN lines you need not a modem and instead use a device called a terminal adapter. What is leased line ? Leased line refers to a phone line connection that is rented for exclusive use from one computer or network to another or for constant access to the internet. It is a dedicated connection between your computer and the computer system of your ISP. You do not need to dial your ISP instead you are permanently connected to your ISP with dedicated telephone line connection. You can transmit digital data at 1.544 mega bits/sec. What is DSL ? Digital subscriber line is modem technology that transforms ordinary telephone line also known as "twisted copper pairs" with high speed digital lines for Instant Internet Access. This technology is promoting high data communications and interactive Video. DSL is the next best choise if cable connection is not available. The DSL modems are a digital coding technique to get tremendous capacity out of your existing phone lines without interfering with regular services. There is no need for any additional dial up and you can talk on your phone or send a fax at the same time while you are surfing the web. DSL is often compared to ISDN. DSL provides speed up to 8 Mbps. These speeds are almost 200 times faster than 28.8 K modems. What is IP Address ? Each server connected to the internet has a numerical Internet Protocol (IP) address. No other computer has the same address. Computers on the internet are able to communicate with each other because they use a standard protocol known as TCP/IP. A fundamental component of this protocol is IP addressing a 32 bit numerical address which is assigned to every host when it connects to the internet. IP address is expressed in decimal no. in the range 0-255, example 202.54.1.18. When you want to connect to any server, you normally enter its address in English words and their numerical IP address is called the domain name server. Whenever we send an email to a computer at the other end of the globe, the domain name server translates the address in English into the numeric IP address necessary to make the connection. What is web browser ? A web brouser is a software that lets users gain access to and navigate the web. A web browser can interpret the links embedded in the documents and access the related documents on demand. The most popular web browser currently in use are Netscape Navigator (or Communicator) and Internet Explorer. What is a search engine ? At present there are over 80 lac web sites. The web is so huge that you need the services of search engine to help you search information on a specific topic or word. Such engines help you to search through more than 100 million web pages on the internet. A search engine is a special kind of website used to find other websites. Search engine take a word or phrase and hunt through lists of all the web pages in the internet to find ones that seem to match what you are trying to find. Some popular search engines are Alta Vista, Excite, Yahoo, Google, Infoseek, Hot Bot, Khoj. What is Java and Java script ? Java is a programming language that was specially designed for the Internet. It is a network friendly programming language devised from C++ language. A java platform runs on any computer but the machine needs a Java Interpreter. All the popular browsers including Netscape Navigator and Internal Explorer include Java Interpreter. Like Java, the Javascript is also programming language aften used when creating websites. Javascript, developed by Netscape in script language that site developers use to create such items as interactive sites and web pages that display in a separate browser window. If your browser does not support Javascript or if it is turned off you will get Javascript error. What is a cookie ? A cookie is a piece of data sent from a website to your browser when your browser requests information from the site. The cookies are stored on your hard drive. Cookies cantain some information about you. For example, if you visit a shopping site, then the cookie from that site may contain your customer ID number so that next time you visit the site, whatever you buy anything it is automatically credited to your customer ID number. What is CPU and it speed ? The heart of a computer (your PC) is a Central Processing Unit (CPU). The CPU incorporates an ALU, a control unit and registers. It is mainly CPU that decides the speed and power of a computer. The base of CPU is a silicon chip. The chip houses millions of transistors that do the basic logical and arithmetic functions in a prescribed sequence. A fast CPU takes less time to complete a task. The speed of CPU usually refers to clock speed. There is a clock on your computer CPU and uses a quartz crystal. This crystal produce million of pulses per second. The clock speed measured in (MHz) supplies the CPU with electrical pulses that synchronizes the instruction the CPU sends to other devices such as ROM, RAM. The CPU can execute an instruction from software. Intel microprocessor, 500 MHz refers to clock speed of 500 MHz. |
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| New!! Learn about Search Engines |
| New!! Learn about Search Engines |
| New!! Learn more about Search Engines |