PCNSA · Question #397
Which two features implement one-to-one translation of a source IP address while allowing the source port to change? (Choose two.)
The correct answer is B. Dynamic IP and Port (DIPP) D. Dynamic IP / Port Fallback. Both Dynamic IP and Port (DIPP) (B) and Dynamic IP/Port Fallback (D) translate the source IP address and also change the source port. DIPP is the standard outbound NAT method where multiple internal hosts share one or more public IPs - the source IP is translated and a unique…
Question
Which two features implement one-to-one translation of a source IP address while allowing the source port to change? (Choose two.)
Options
- ADynamic IP
- BDynamic IP and Port (DIPP)
- CStatic IP
- DDynamic IP / Port Fallback
How the community answered
(38 responses)- A11% (4)
- B76% (29)
- C13% (5)
Explanation
Both Dynamic IP and Port (DIPP) (B) and Dynamic IP/Port Fallback (D) translate the source IP address and also change the source port. DIPP is the standard outbound NAT method where multiple internal hosts share one or more public IPs - the source IP is translated and a unique port is assigned per session. Dynamic IP/Port Fallback (D) is a fallback mechanism activated when the DIPP address pool is exhausted; it falls back to the egress interface IP with port translation, also changing the source port. By contrast, Dynamic IP (A) translates the source IP one-to-one from a pool but preserves the source port (no port translation). Static IP (C) performs a fixed one-to-one bidirectional IP mapping and does not change the source port.
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