Which of the following descriptions of static NAT is incorrect?

Question

Options

• AWhen using static NAT, each private address has a corresponding and fixed public address.
• BUsing static NAT, when the external network accesses the internal network, the public address (destination address) carried in the packet will also be translated to the private address.

• A
  25% (17)
• B
  75% (50)

Explanation

Option B is the incorrect description because, for inbound traffic in static NAT, only the destination IP address is translated - from the mapped public address to the corresponding private address - and no other address field in the packet is changed; the word "also" misleadingly implies that an additional translation occurs alongside the destination address change, which does not happen in standard static NAT. Option A is a fully accurate description: each private address has exactly one fixed, permanent public address counterpart, which is the defining characteristic that separates static NAT from dynamic NAT, where mappings are created on demand and expire after use. Unlike dynamic NAT, static NAT allows external hosts to reliably initiate connections to internal hosts because the public address is always reserved and the mapping is always active.

Memory tip: Think of static NAT as a permanent two-way mailbox - outbound mail (internal to external) has its return address rewritten from private to public, and inbound mail (external to internal) has its delivery address rewritten from public to private, with nothing else about the envelope changing in either direction.

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