What can you use as a protective barrier on a network to keep out unauthorized traffic?

A) Firewall
B) Network attached storage (NAS)
C) Encryption
D) Biometric devices

Firewall

A system for securing the network that supervises and regulates the flow of data entering and leaving according to established security protocols.

Unauthorized Traffic

Network activity or data transfer that has not been permitted, often indicative of a security breach or malicious intent.

Protective Barrier

A physical or electronic means designed to protect objects, information, or areas from unauthorized access or harm.