Information, Computer and Network Security Terms Glossary and
DoS: Denial of Service
Denial of Service (Dos) is the prevention of authorized access to a system resource or the delaying of system operations and functions. DoS happens when network bandwidth or computational resource is exausted by authorized usage or by people launching DoS attacks.
IP Spoofing, TCP/IP network vulnerability ,
http://www.cert.org/tech_tips/denial_of_service.html: Denial of Service