ZyXEL Communications 2602HWNLI-D7A User Manual

Prestige 2602HWNLI-D7A Support Notes

197

1. Serial number of the device.

2. SIP Call server type and vendor.

3. Your device firmware version and romfile with password.

4. Detail information what you have tried to resolve the problem.

I suspect there is a hardware problem with my Prestige what should I do?

Please follow the troubleshooting section in the user’s guide for brief hardware troubleshooting and

diagnostic tips. If you are sure there is a hardware problem after following the hardware diagnostic tips
in the user’s guide. Please contact your ZyXEL local vendor to send the device in for RMA service.

Firewall FAQ

What is a network firewall?

A firewall is a system or group of systems that enforces an access-control policy between two networks.

It may also be defined as a mechanism used to protect a trusted network from an untrusted network. The

firewall can be thought of two mechanisms. One to block the traffic, and the other to permit traffic.

What makes Prestige firewall secure?

The Prestige firewall is pre-configured to automatically detect and thwart Denial of Service (DoS) attacks

such as Ping of Death, SYN Flood, LAND attack, IP Spoofing, etc. It also uses stateful packet inspection

to determine if an inbound connection is allowed through the firewall to the private LAN. The Prestige

supports Network Address Translation (NAT), which translates the private local addresses to one or

multiple public addresses. This adds a level of security since the clients on the private LAN are invisible

to the Internet.

What are the basic types of firewalls?

Conceptually, there are three types of firewalls:

1. Packet Filtering Firewall

2. Application-level Firewall

3. Stateful Inspection Firewall