H12-821_V1.0 · Question #875
Using NAT technology, only the network layer information (IP address) in the data packet can be translated.
The correct answer is A. TRUE. Option A is correct because basic NAT operates strictly at Layer 3 (the Network Layer) of the OSI model, replacing only the source or destination IP address in a packet's header as it passes through the NAT device. The transport layer (port numbers), application data, and all…
Question
Options
- ATRUE
- BFALSE
How the community answered
(23 responses)- A74% (17)
- B26% (6)
Explanation
Option A is correct because basic NAT operates strictly at Layer 3 (the Network Layer) of the OSI model, replacing only the source or destination IP address in a packet's header as it passes through the NAT device. The transport layer (port numbers), application data, and all other header fields remain untouched in standard NAT operation.
Option B is incorrect because it would imply NAT can also modify transport-layer or application-layer data, which is beyond the scope of basic NAT - that function belongs to extended variants like PAT (Port Address Translation) or NAPT, which are distinct technologies.
Memory tip: Think of NAT as a "postal address translator" - it only changes the address on the envelope (IP address = Layer 3), not what's written inside the letter (transport/application layers). If it changes the "return mailbox number" (port), that's PAT, not basic NAT.
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