A proxy refers to a server that functions as an intermediary between a client work station and the Internet. It ensures administrative control and security. Furthermore, it enables the use of caching services for work stations in the network.
How does a proxy server work? Its function starts when a user sends a request for an Internet service, such as a request to access a Web page. Once the request passes the proxy’s filtering requirements, the proxy will check in its local cache if it has the requested Web page. The proxy’s local cache contains the pages previously downloaded by the server.
If the proxy has the requested page in its local cache, it will forward the page to the user’s work station. This is done without accessing the Internet.
If the proxy does not find the page in its local cache, the proxy will act as a client, and use one of its IP addresses to forward the page request to the main server. The main server will then find the page on the Internet. When the page is obtained, the proxy receives it and forwards it to the user who requested it. All this is done by the proxy while remaining invisible to the user.
A proxy associates with other servers in order to perform its functions. First, a proxy server is associated with a gateway server, which separates the network from external networks. Second, a proxy server is associated with a firewall. This application protects the network against unauthorized intrusions. There are applications that combine the functions of a proxy, a gateway, and a firewall in one interface.
Cookies are files containing information about the user’s activities in a particular website. These files are sent by the Web server to the Web browser of the user. The stored cookies on the user’s computer can then be used by the Web server next time the user accesses the server’s site.
Similar to other files in the computer, the user also needs to remove cookies once in a while. This process will depend on the type of Internet browser the user is using.
Internet Explorer 7
- Close Internet Explorer.
- Go to Start/Run.
- Enter inetcpl.cpl on the Run field.
- Click on the General tab and go to the Internet Properties dialog box.
- Click on the “Delete Under Browsing History” option.
- Click on “Delete Cookies” and confirm by clicking Yes.
For users of Internet Explorer 6 and lower, go to the Cookies folder, search for the cookies you want to remove, and delete it.
- Go to the Tools menu of your Firefox window.
- Click on Options.
- Go to the left-hand panel and click on the Privacy icon.
- Click on Cookies and click on the “View Cookies” option.
- If you want to remove a specific cookie, click on it and hit the remove button.
- Click on the “Remove All Cookies” option to delete all the cookies in Mozilla Firefox.
Netscape Navigator 7
- Go to the Tools Menu.
- Choose Cookie Manager.
- Select the Manage Stored Cookies option.
- You can remove a cookie from the list or delete them all.
- Go to Tools Menu.
- Click on “Delete Private Data”.
- You can delete cookies after each session by going to Tools/Preferences and going to Privacy Settings. To delete a particular cookie, click on Manage Cookies.
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