Difference between an internal and an external firewall?"

List three design goals for a firewall.
List
What information is used by a typical packet filtering firewall?
What are some weaknesses of a packet filtering firewall?
What is the difference between a packet filtering firewall and a stateful inspection firewall?
What is an application-level gateway?
What is a circuit-level gateway?
What are the common characteristics of a bastion host?
Why is it useful to have host-based firewalls?
What is a DMZ network and what types of systems would you expect to find on such networks?
What is the difference between an internal and an external firewall?"