100-150 Question 70
Single answerA small business has been assigned a public IP address range of 203.0.113.0/24 and wants to allow its internal devices (using private IPs) to access the internet. Which type of NAT would be most appropriate for this scenario?
- A
Static NAT
- B
Dynamic NAT
- C
PAT (Port Address Translation)
- D
No NAT is required
Show answer and explanation
Correct answer: C
Explanation
PAT (Port Address Translation) is the best solution for this scenario because it enables multiple internal devices using private IPs to share a single public IP address. By using different port numbers, PAT ensures efficient use of the limited public IP address space while allowing all internal devices to access the internet simultaneously.
- A. Incorrect.
Static NAT maps a single private IP address to a single public IP address. This is not practical for a small business with many internal devices sharing one or a few public IPs.
- B. Incorrect.
Dynamic NAT maps a set of private IP addresses to a pool of public IP addresses. However, it does not allow multiple devices to share the same public IP at the same time.
- C. Correct.
PAT (Port Address Translation) allows multiple private IP addresses to share a single public IP address by using different port numbers. This is the most appropriate solution for efficiently allowing many devices to access the internet.
- D. Incorrect.
Not using NAT would expose private IPs directly to the internet, which is not routable or secure. NAT is required to enable internet access for private IPs.