Firewalls function as one or more of the following: packet filter, proxy, stateful inspection, and application firewall.

Describe the concept of a packet filter.

Discuss how you would implement a rule for a packet filter firewall to block a port or a protocol.

How would you test the rule?

How would you test a stateful firewall's rules?

What tools would you use?

Explain application firewalls.

Cite references