Services offered by the firewall
Services offered by the firewall are:
- Static-packet filtering
- Circuit-level firewalls
- Proxy server
- Application server
- NAT
- Stateful packet inspection
Static-packet filtering
It is a firewall and the routing ability of a device that can filter packets based on fields of the packet and the rules configured by the administrator. The administrator can define rules (ACLs) to manage allowed ports and IP addresses at Layer 3 and Layer 4:
Circuit-level firewalls
It is also known as a transparent proxy firewall. This firewall cannot change the request or response beyond the authentication and authorization required by the proxy:
Proxy server
It is a server or a computer that provides indirect access (network connections) to the other network services. When a client requires a connection with the network, the client sends a request and the proxy server serves the requirement form the cache.
There are four different types of proxy servers:
- Transparent proxy
- Anonymous proxy
- Distorting...
