What is attack?
attack meaning in Internet terms is
Definition: An attempt to gain unauthorized access to system services, resources, or information, or an attempt to compromise system integrity.
Extended Definition: The intentional act of attempting to bypass one or more security services or controls of an information system.
Related Term(s): active attack, passive attack
From: NCSD Glossary. NTSSI 4009 (2000), CNSSI 4009