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Define the term - Proxy servers
These types of firewalls have been further classified into two types: application level gateways and circuit level gateways.
The application level gateways establish a connection to a remote system on behalf of specific applications. This type of firewall is usually a collection of application proxies, with a one-to-one relationship between the application used and its proxy.
Whereas the circuit level gateways provide the proxy or relay capabilities in a much-generalised form, which is not limited to specific applications. The primary advantage of such firewalls over application level gateways is that they do not require a specific application proxy for each new application that needs to be communicated outside the internal network.
Although in terms of security measure the proxy servers are very secure, they require a lot of programming which can result in a delay in release of new proxies for application level gateways as well as tend to be highly CPU intensive, thereby directly having impact on the overall network performance.
Hardware difficulty It refers to the price of hardware logic like connectors, wires, switches, arbiter etc. that are required for execution of interconnection network.
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