What is a computer?

…But there are plenty of problems as well

1. It is expensive thy need people to maintain.
2.  They are not perfect and they breakdown and have frequent power cuts.
3.  They are not secure and unauthorised users can hack into your computer.

Network security

Access security limits a persons network

1. All authorised users should be given usernames and should create their own passwords.
2. Users should change their passwords frequently.
3. Individual users can be assigned access rights for example network managers can be given to access software that controls how the network runs. Other users can be limited to certain types of application software such as word processors

Data security prevents loss of data 

1. Some software and files can be software-protected so that a password is needed to view and amend
2. Files can be made read only so that they cannot be altered or deleted.
3. Regular backups should be made of the data on the system using suitable backup storage.
4. Archiving means coping or moving a file somewhere for long-term

Physical security protects hardware

Follow the seven sad flab rules 

1. Serial numbers- Keep a record of all serial numbers
2. Alarm- Computer rooms should be protected by alarms
3. Doors- lock doors
4. Fire protections- Use smoke alarms and fire doors
5. Lock- Lock widows to prevent access
6. Avoid- having computers on the ground floor
7. Blinds- or curtains should be closed at night and monitors should be switched off