Internet Access; Lan To Lan Application; Firewall For Secure Broadband Internet Access; Figure 1 Zyxel Device Internet Access Application - ZyXEL Communications 802.11g ADSL 2+ 4-Port Security Gateway HW-D Series User Manual

P-662H/HW-D Series User's Guide

1.1.2.1 Internet Access

The ZyXEL Device is the ideal high-speed Internet access solution. Your ZyXEL Device
supports the TCP/IP protocol, which the Internet uses exclusively. It is compatible with all
major ADSL DSLAM (Digital Subscriber Line Access Multiplexer) providers. A DSLAM is a
rack of ADSL line cards with data multiplexed into a backbone network interface/connection
(for example, T1, OC3, DS3, ATM or Frame Relay). Think of it as the equivalent of a modem
rack for ADSL. In addition, the ZyXEL Device allows wireless clients access to your network
resources. A typical Internet access application is shown below.

Figure 1 ZyXEL Device Internet Access Application

1.1.2.2 LAN to LAN Application

You can use the ZyXEL Device to connect two geographically dispersed networks over the
ADSL line. A typical LAN-to-LAN application example for the ZyXEL Device is shown as
follows.

Figure 2 ZyXEL Device LAN-to-LAN Application Example

1.1.3 Firewall for Secure Broadband Internet Access

The ZyXEL Device provides protection from attacks by Internet hackers. By default, the
firewall blocks all incoming traffic from the WAN. The firewall supports TCP/UDP
inspection and DoS (Denial of Services) detection and prevention, as well as real time alerts,
reports and logs.
46 Chapter 1 Getting To Know Your ZyXEL Device