List and describe the types of hardware devices and software programs that perform packet filtering.
What will be an ideal response?
Routers: These are probably the most common packet filters. Most modern routers are capable of rudimentary packet filtering, but with drawbacks.
Operating systems: Some systems, like Windows and Linux, have built-in utilities that can filter packets on the TCP/IP stack of the server software. Linux has a kernel-level packet filter called IPtables; Windows has TCP/IP Filtering.
Software firewalls: Most enterprise-level programs, such as Check Point FireWall-1, filter packets, as do personal firewalls like ZoneAlarm and Sygate Personal Firewall, although, in general, personal firewalls use less sophisticated methods than enterprise-level ones.
Firewall appliances: These are the most recognizable firewalls. Appliances are standalone hardware and software devices that have self-contained components. When customers purchase firewall appliances, they receive a device that is connected to the network, configured, and then set into operation. They receive all of the hardware, software, and networking components they need in one package.
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a. true b. false