Zyxel-communications 200 Series Manual do Utilizador descarregar pdf (Página 481)

Chapter 28 Anti-Virus

ZyWALL USG 100/200 Series User’s Guide

• HAV scanners are slow in stopping virus threats through real-time traffic (such as from

the Internet).

• HAV scanners may reduce computing performance as they also share the resources (such

as CPU time) on the computer for file inspection.

• You have to update the virus signatures and/or perform virus scans on all computers in the

network regularly.

A network-based anti-virus (NAV) scanner is often deployed as a dedicated security device

(such as your ZyWALL) on the network edge. NAV scanners inspect real-time data traffic

(such as E-mail messages or web) that tends to bypass HAV scanners. The following lists

some of the benefits of NAV scanners.

• NAV scanners stops virus threats at the network edge before they enter or exit a network.

• NAV scanners reduce computing loading on computers as the read-time data traffic

inspection is done on a dedicated security device.

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Zyxel-communications 200 Series Manual do Utilizador Página 481