Introduction of Network Security,

·        Security attacks means any attacker hack security information when any person or organization sharing their own information’s.

(1)    Passive attach cannot affect source information.

(2)    Active attach can affect source information

·        Security Mechanisms  designed to detect, prevent, or recover from attacker

·        Security Service means that uses one or more security mechanisms.

(1)    Used of Authentication Methods

(2)    Used of ACL