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300-410 Practice Question: In the context of NAT and PAT, what is the…
In the context of NAT and PAT, what is the purpose of the ip nat translation timeout command?
⚠ Common exam trap
Cisco often tests the distinction between global and per-interface NAT configuration, leading candidates to incorrectly assume that `ip nat translation timeout` can be applied under a specific interface, when in fact it is always a global command that affects all dynamic translations on the router.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
It configures the timeout for all dynamic NAT translations globally.
The `ip nat translation timeout` command sets the global idle timeout for all dynamic NAT translations, including both TCP and UDP. When a dynamic translation is no longer active, this timer determines how long the NAT entry remains in the table before being removed, freeing resources. Static NAT entries are not affected by this command because they are manually configured and persist indefinitely unless explicitly removed.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
It sets the timeout for static NAT entries.
Why it's wrong here
Static NAT entries are permanent and do not have a timeout.
- ✓
It configures the timeout for all dynamic NAT translations globally.
Why this is correct
Correct. This command sets the global timeout for dynamic NAT entries.
- ✗
It sets the timeout only for TCP translations.
Why it's wrong here
Protocol-specific timeouts are set with separate commands like ip nat translation tcp-timeout.
- ✗
It configures the timeout for translations on a specific interface.
Why it's wrong here
This command is global, not interface-specific.
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Senior Network & Security Engineer · founder of Courseiva
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