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Summary
In this chapter, we discussed the ISA firewall's application layer filtering feature set. We discussed the two main types of application filters employed by the ISA firewall: access filters and security filters. While we broke down the ISA firewall's filters into these two main categories, this is not to say that access filters are unsecure. Both the access filters and the security filters impose requirements that the connections meet specifications of legitimate communications using those protocols.We finished the chapter with a discussion of the ISA firewall's intrusion detection and prevention mechanisms. You learned about common network layer attacks that can be launched against the ISA firewall and how the ISA firewall protects you against them.
