Commercial firewalls do not generally use the terminology packet filter, stateful packet filter, or application proxy. However, any firewall must be one of these three types, or a combination thereof.
Find information on a commercial firewall product and explain (using the terminology of this chapter) which type of firewall it really is.
In this chapter, we discussed three types of firewalls: packet filter, stateful packet filter, and application proxy.
a. At which layer of the Internet protocol stack does each of these firewalls operate?
b. What information is available to each of these firewalls?
c. Briefly discuss one practical attack on each of these firewalls.
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