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...