When is port mapping used?

• A. When equipment is changed or breaks
• B. During routine maintenance
• C. When software is updated
• D. When the system is powered off

Answer: (A)

Port mapping is about reassigning or re-pointing the network ports so that connections go to the correct device after a hardware change or failure. When equipment is changed or breaks, the existing ports may now connect to different hardware, so remapping ensures continued access to services without requiring everyone to reconfigure their setups. This is why the best choice is that port mapping is used in those hardware-change or failure situations.

Routine maintenance, software updates, or powering the system off don't inherently require remapping ports. Routine maintenance might involve updates or checks on existing hardware, but the port connections themselves typically remain valid. Software updates usually change software configuration rather than the physical port mappings. Powering off is simply a shutdown, and any necessary port mapping would be addressed upon startup if it’s needed, not as a routine action.