Proxy Server

A is also known as a ‘proxy’ or ‘application level gateway’. In computer networks, such as the Internet, a is an application or digital system that functions as a go-between for local and public networks clients that request services (connections, specific web pages, files, etc) from another server. When a client server connects to the proxy, the assesses the traffic based on specific protocols.

The application level gateway model was devised many years ago, with the aim of streamlining and managing distributed systems. Without Internet proxies, which form the bulk of s, the World Wide Web wouldn’t be nearly as functional.

So how does a work? Basically, it intercepts a communication between a messenger and a receiver. One port receives all incoming data, which is subsequently routed to the rest of the network through a different port.

Sometimes a proxy will modify a request or particular server’s reply. Other times, a proxy may supply a resource without communicating with the particular server. In such cases the proxy caches the remote server’s responses and automatically sends any requests for the same service.

s deliver improved operation and security. Application level gateways can even screen employees’ use of resources outside the local server. Further more, proxies bar uninterrupted contact between networks, making it more difficult to access private information and addresses. In other words, s hinder hacker activity. These servers also serve to enhance network security by forming parts of firewalls and blocking certain computers from accessing particular data or websites on a network (i.e. some companies block Facebook and MySpace on internal networks).
Some s filter requests using Internet Protocol (IP) address. The filter then approves the address and links the server to the resource on the client’s behalf. The proxy uses a single organization-wide IP address to direct and return client requests.

In some case s are a collection of applications that block public web resources. For instance, a HTTP proxy service will interrupt access to the Internet, while an SMTP proxy intersects email services.