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5.4
Firewall
The Firewall function helps to protect your local network against attacks from outside. It also
provides a way of restricting users on the local network from accessing the Internet.
Additionally, it can filter out specific packets to trigger the router to place an outgoing
connection.
5.4.1
QoS
Quality of Service (QoS) refers to the capability of a network to provide better service to
selected network traffic over various technologies, including Frame Relay, Asynchronous
Transfer Mode (ATM), Ethernet and 802.1x networks, and IP-routed networks that may use
any or all of these underlying technologies. The primary goal of QoS is to provide priority
including dedicated bandwidth, controlled jitter and latency (required by some real-time and
interactive traffic), and improved loss characteristics. Also important is making sure that
providing priority for one or more flows does not make other flows fail. QoS technologies
provide the elemental building blocks that will be used for future business applications in
campus, WAN and service provider networks. This chapter provides each setting of QoS.
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