Active attack (Denial of service Dos means: firewall, IDS) && passive attack (traffic analysis, monitoring)
Symmetric encryption algorithm
Extension (IPsec AH data integrity ESP symmetric encryption DH key exchange)
digital signature
Digital certificate and CA red focus
PKI and kerberos system
SQL injection attack
XSS Cross Site Scripting Attack
Attack Signature Remember Keyword
virus type
example:
Network Security Level Standard
