1. What is the typical relationship among the untrusted network, the firewall, and the trusted network?
  2. How is an application layer firewall different from a packet-filtering firewall? Why is an application layer firewall sometimes called a proxy server?
  3. How is static filtering different from dynamic filtering of packets? Which is perceived to offer improved security?
  4. What is a circuit gateway, and how does it differ from the other forms of firewalls?
  5. What special function does a cache server perform? Why is this useful for larger organizations?

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