Computers communicate over a network to share data & resources easily. This info is usually private & should not be visible to others, so security is very crucial in computer networking.
A standard for data security that identifies attacks on a system. Also, it identifies various security services and mechanisms to implement those services in various layers of the OSI model.
A security attack is an attempt to compromise the security of a system. These attacks can be successful or unsuccessful, and can be either active or passive.