ZyXEL Communications P-334WT Support Notes page 26

General
1. What is a network firewall?
2. What makes P-334WT secure?
3. What are the basic types of firewalls?
4. What kind of firewall is the P-334WT?
5. Why do you need a firewall when your router has packet filtering and NAT built-in?
6. What is Denials of Service (DoS)attack?
7. What is Ping of Death attack?
8. What is Teardrop attack?
9. What is SYN Flood attack?
10. What is LAND attack?
11. What is Brute-force attack?
12. What is IP Spoofing attack?
13. Why traffic redirect/static/policy route be blocked by P-334WT?
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-334WT secure?
The P-334WT 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-334WT
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