What is the major benefit of using NAT with Port Address Translation?

Question:
What is the major benefit of using NAT with Port Address Translation?

• It allows external hosts access to internal servers.
• It allows many internal hosts to share the same public IPv4 address.
• It improves network performance for real-time protocols.
• It provides a pool of public addresses that can be assigned to internal hosts.

Explanation: Port Address Translation (PAT) tracks IP flows of internal hosts using port numbers. By using port numbers to track flows, PAT allows many users to share a single public IPv4 address.

Exam with this question: CCNA 2 (v5.0.3 + v6.0) Chapter 9 Exam Answers