312-50V9 Question #146: Real Exam Question with Answer & Explanation

The correct answer is D: A static NAT uses a one-to-one mapping.. Static NAT creates a permanent, one-to-one mapping between a single private IP address and a single public IP address.

Question

Which of the following descriptions is true about a static NAT?

Options

AA static NAT uses a many-to-many mapping.
BA static NAT uses a one-to-many mapping.
CA static NAT uses a many-to-one mapping.
DA static NAT uses a one-to-one mapping.

Explanation

Static NAT creates a permanent, one-to-one mapping between a single private IP address and a single public IP address.

Common mistakes.

A. Many-to-many mapping does not describe any standard NAT type - NAT types are defined as one-to-one (static), one-to-many (PAT/overload), or many-to-one (dynamic pool).
B. One-to-many mapping describes PAT (Port Address Translation), also called NAT overload, which maps many private addresses to a single public IP using port differentiation.
C. Many-to-one mapping describes dynamic NAT with overload or PAT, where multiple internal hosts share a single public IP, not static NAT.

Concept tested. Static NAT one-to-one address mapping

Reference. https://www.cisco.com/c/en/us/support/docs/ip/network-address-translation-nat/26704-nat-faq-00.html

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