ZyXEL Communications ZyXEL ZyAIR 100 - Manual (Page 147)

ZyWALL 10~100 Series Internet Security Gateway
Firewalls 11-3
Figure 11-1 ZyWALL Firewall Application
11.4 Denial of Service
Denials of Service (DoS) attacks are aimed at devices and networks with a connection to the Internet. Their
goal is not to steal information, but to disable a device or network so users no longer have access to network
resources. The ZyWALL is pre-configured to automatically detect and thwart all known DoS attacks.
11.4.1 Basics
Computers share information over the Internet using a common language called TCP/IP. TCP/IP, in turn, is a
set of application protocols that perform specific functions. An “extension number”, called the "TCP port" or
"UDP port" identifies these protocols, such as HTTP (Web), FTP (File Transfer Protocol), POP3 (E-mail),
etc. For example, Web traffic by default uses TCP port 80.
When computers communicate on the Internet, they are using the client/server model, where the server
"listens" on a specific TCP/UDP port for information requests from remote client computers on the network.
For example, a Web server typically listens on port 80. Please note that while a computer may be intended