Internet Dialup Broadband Proxy Server in Internet

INTERNET ON A PC

Internet is the backbone of modern communication system. In today's life, we are dependent on the internet for almost everything from information collection to carry out various activities such as reservation, online shopping and education. Internet is a collection of computers world over connected together to share various resources.

There  are  various  ways  to  connect  an  internet.  Generally  dial-up		connection	and
broadband connection are   the two types  of	internet  connections	which are	used
commonly.

Dial-up Internet Connection

It is a way to connect to the internet in which public switched telephone network (PSTN) is used to make a Internet connection via telephone lines to an internet service provider (ISP). In dial-up connection telephone network is of prime importance. Since dial-up connection requires telephone lines which have limited capacity. Its transmission speed is limited and it is slow. Generally dialup operate at speeds of 14.4Kbit, 28.8Kbit, or 56Kbit. Dialup speeds vary by the quality of the phone line and the many different user configurations. A MODEM is required for dial-up internet connection. MODEM is short form of modulator-demodulator. A modem is a hardware device or a software application program that is used in a computer to transmit data/ information over a network such as a telephone or cable lines. In computer information is stored in digital form whereas information transmitted over telephone lines is transmitted in the form of analog signal. A modem is used to convert between these two forms of analog to digital and vice versa. Now-a-days, dial-up connections are gradually being replaced by Broadband

connections.

 Broadband Internet Connection

Broadband Connection is a high data rate connection as compared to dial-up connection. Broadband has very high rate of data transmission. In contrast to dialup connection, it is a permanent connection, which can be set up over a high-speed communication links. Generally, an internet connection of 256 kbps (kilo byte per second) or more is considered as broadband Internet connection. Multimedia applications such as video and computer games, can be downloaded very quickly and easily with broadband connection which was not possible, as fast in dial-up connection.

Webcasting is nothing but broadcasting on the internet. This facility is possible only due

to high speed internet connection such as broadband connection. When we distribute

same media files over the internet to  different users using streaming media technology, it

is called as webcast. Now-a-days, online web media is a great source of information and

it  is  being  successfully  used  in  different  sectors  such  as  education,  entertainment,

technology etc. Online education is one of the most important field which is using this

facility. You can find several webcast academic classes on the internet by experts. Even

you can find the web lecturers on web link: http://www.ignouonline.ac.in/Broadcast/ Proxy Server Proxy server is used in a computer network. Proxy server is a server which acts as an intermediary between the client application and the Web server. Proxy server is used to  improve performance and for filtering purposes. In an organization, proxy server can be used to prevent its employee to access certain types of website. It provides security and check to the overall system. It can also improve the performance of the network. Suppose two users access the web through proxy server. If user X requests a webpage, say page 1. Sometime later if user Y requests the same page then this request will not forwarded to the web server. Proxy server simply returns the same page which it has access for user X, thus saving lot of time. You may  configure Internet Explorer to use a proxy over a LAN connection on your PC. To configure Internet Explorer 6.0 on your PC, follow the following steps: 1.    On the  Tools  menu  in Internet  Explorer,  you  click  Internet Options,  click the Connections tab, and then click LAN Settings. 2.    Under Proxy server, click to select the Use a proxy server for your LAN chec box.        In the Address box, type the IP address of the proxy server. 3.    In the Port box, type the port number that is used by the proxy server for client                  connections. The port number by default is 8080. 4.    You can click to select the Bypass proxy server for local addresses check box if you     do not want the proxy server computer to be used when you connect to a computer on        the local network (this may speed up performance). 5.    Click OK to close the LAN Settings dialog box.      6. Click OK again to close the Internet Options dialog box You will learn in more details about computer networks and Internet in Block 3 of this course. Check Your Progress 1.      True/False (a)    A Desktop is a storage area for software and programs. (b)   Recycle bin is the default space where all the files are stored unless we                    specifically instruct the computer to save at a specified location. (c)    Direct connection and dial-up connection are two main methods to connect to          Internet.       (d) For dial up connection to the Internet, you need to have an account on an ISP. (a)  False   (b) False    (c)True (d) True 2.      Fill in blanks (i)             …………… is a temporary folder which holds files and folders before it is permanently deleted from the storage devices. Recycle bin (ii)          The most common desktop environment on Personal Computer is …………… (iii)         A ………….. is an area which holds windows, menus, icons etc.  desktop (i) Recycle Bin (ii) Microsoft Windows interface (iii) Desktop 3.      What is desktop on a computer? What are different items found on desktop?     Desktop is a place on our computer which holds icons, folders, files etc. it is the      background area on our computer screen. We can also customize our desktop in    different ways like we can add background picture, background colors etc. When we     start our computer desktop is the first thing which comes in front of us.                Some of the items found on the Desktop are: ·         My Computer ·         My Documents ·         Recycle Bin ·         Task Bar 4.      What are the different methods for accessing the internet? Explain methods.

                        The two primary methods of accessing the Internet are through a direct connection and dial-up connections through a modem and phone line. Direct connection is an                  ISDN (Integrated services digital network) line, a fiber optical line etc. Direction internet connection is faster than dial-up connection. It is a permanent connection,                     which can be set up over a high-speed communication line. This is normally used in organizations and corporate, using cable modem (used for cable Internet) and DSL               connect to the Internet.

          In Dial-Up connection, telephone lines are used to establish a connection to the internet service providers (ISP). Dial-up internet service is provided through a                     number of ISPs. A Modem is required for dial-up internet connection.