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31 Days Before Your CCENT Certification by Scott Bennett

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Day 4: Security Applications

A firewall can come packaged as a standalone security appliance, a server-based firewall that installs on a network operating system (NOS), a module that can be installed or is integrated inside an existing router, or a personal firewall that installs on a network host. Firewalls are installed between two networks and can control traffic in the following ways:

Filter traffic based on destination and source IP address or MAC address, block websites based on uniform resource locator (URL) or keywords, and filter traffic based on the type of application used for network transmission.

• Inspect incoming traffic and ensure that each incoming packet is a response to a legitimate outgoing request. This stateful packet ...

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