Which one of the following is often used to protect an intranet from unauthorised access by an external hacker?
A、Anti-virus software
B、Data encryption
C、Firewall
D、Passwords
A、Anti-virus software
B、Data encryption
C、Firewall
D、Passwords
【参考答案及解析】
Passwords are used to prevent access to files and programs within a system, rather than preventing access to the system at all.
Passwords are used to prevent access to files and programs within a system, rather than preventing access to the system at all.