Concatenation, which mean we combine two or more strings into one.
Its TRUE firewalls filters traffic
Firewall is a network security system that monitors and controls incoming and outgoing network traffic based on predetermined security rules.Firewall typically establishes a barrier between a trusted internal network and untrusted external network such as the internet.
MS-DOS. MS-DOS stands for Microsoft Disk Operating System. It was the first widely installed operating system for personal computers but became obsolete with the arrival of more advanced graphical user interfaces such as MAC OS developed by Apple, Inc.
Good Luck!
