CCNA: Cisco Certified Network Associate — Question 1008

Which device protects an internal network from the Internet?

Answer options

• A. router
• B. firewall
• C. access point
• D. Layer 2 switch

Correct answer: B

Explanation

The correct answer is B, as a firewall is specifically designed to filter incoming and outgoing traffic to protect the internal network. A router (A) primarily directs traffic but does not inherently provide security features, while an access point (C) is used for wireless connectivity, and a Layer 2 switch (D) operates at the data link layer without advanced security measures.