ZyXEL 793H v2 User's Guide download pdf (Page 21)

P-793H v2 Support Notes

Triple Play is a VLAN-based policy to forward packets from LAN ports to

different PVCs, thus you can configure each PVC separately to assign different

QoS to different application.

Firewall FAQ

General

1. 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.

2. What makes P-793H v2 secure?

The P-793H v2 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 P-793H v2

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.

3. 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

Packet Filtering Firewalls generally make their decisions based on the header

information in individual packets. These headers information include the source,

destination addresses and ports of the packets.

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ZyXEL 793H v2 User's Guide Page 21