Which two options can limit the information discovered from port scanning? (Choose two.)

Which two options can limit the information discovered from port scanning? (Choose two.)

• passwords
• intrusion prevention system
• firewall
• authentication
• encryption
  

  Answers Explanation & Hints: Using an intrusion prevention system (IPS) and firewall can limit the information that can be discovered with a port scanner. Authentication, encryption, and passwords provide no protection from loss of information from port scanning.