Network Security Measures
Firewalls are hardware, software or a router that monitors the incoming and outgoing data packets of a network and rejects any unauthorised data packets.
Passwords are a combination of characters, often associated with a username, used to unlock certain computer resources.
Physical Security Measures
Locked Servers - Servers should be stored in cages and locked to prevent unauthorised access
Restricted access to server rooms - this can be done through keycards or biometric security
Locking doors after use