Which one of the following is NOT commonly used to prevent malicious activity from entering a network?
a. Router
b. Intrusion detection system
c. Firewall
d. Proxy server
Answer: b. Intrusion detection system
Which one of the following is NOT commonly used to prevent malicious activity from entering a network?
a. Router
b. Intrusion detection system
c. Firewall
d. Proxy server
Answer: b. Intrusion detection system