Question 1,685 of 2,152

NAT and PAT →easyMultiple ChoiceObjective-mapped

IP NAT Translation Timeout Command

This 300-410 practice question tests your understanding of nat and pat. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.

In the context of NAT and PAT, what is the purpose of the ip nat translation timeout command?

A
It sets the timeout for static NAT entries.
Why wrong: Static NAT entries are permanent and do not have a timeout.
B
It configures the timeout for all dynamic NAT translations globally.
Correct. This command sets the global timeout for dynamic NAT entries.
C
It sets the timeout only for TCP translations.
Why wrong: Protocol-specific timeouts are set with separate commands like ip nat translation tcp-timeout.
D
It configures the timeout for translations on a specific interface.
Why wrong: This command is global, not interface-specific.

Full breakdown with real-world context →

Quick Answer

The answer is that the ip nat translation timeout command configures the timeout for all dynamic NAT translations globally. This command sets the default idle timer that applies to every dynamic translation entry in the NAT table, regardless of the protocol being used. On the Cisco CCNP ENARSI 300-410 exam, this concept tests your understanding of how NAT timers interact—specifically, that this global timeout acts as a fallback value, and that protocol-specific commands like ip nat translation udp-timeout will override it for their respective traffic. A common trap is assuming that changing the global timeout only affects TCP or UDP, when in fact it applies to all dynamic translations unless a more specific timer is configured. Remember the hierarchy: global first, then protocol-specific overrides. For a quick memory tip, think of the global timeout as the "catch-all" timer—if no protocol-specific timer exists, this one controls the translation lifetime.

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.

Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.

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.
Related concept
Read the scenario before looking for a memorised answer.
✗
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.

Common exam traps

Common exam trap: answer the scenario, not the keyword

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.

Trap categories for this question

Command / output trap
Protocol-specific timeouts are set with separate commands like ip nat translation tcp-timeout.

Detailed technical explanation

How to think about this question

Under the hood, the default timeout for dynamic NAT translations is 86400 seconds (24 hours) for UDP and 3600 seconds (1 hour) for TCP, but the `ip nat translation timeout` command overrides the global default for all protocols. In real-world scenarios, reducing this timeout is critical for conserving NAT pool resources in environments with high-volume, short-lived connections (e.g., web browsing), while increasing it may be needed for long-lived protocols like VoIP or database replication. Note that the command does not affect Port Address Translation (PAT) entries using the same IP and different ports—those are timed independently based on protocol-specific timers.

KKey Concepts to Remember

Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.

TExam Day Tips

Watch for words such as best, first, most likely and least administrative effort.
Review why wrong options are wrong, not only why the correct option is correct.

Key takeaway

Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.

Real-world example

How this comes up in practice

A small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.

Visual reference

What to study next

Got this wrong? Here's your next step.

Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.

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FAQ

Questions learners often ask

What does this 300-410 question test?

NAT and PAT — This question tests NAT and PAT — Read the scenario before looking for a memorised answer..

What is the correct answer to this question?

The correct answer is: 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.

What should I do if I get this 300-410 question wrong?

Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.

What is the key concept behind this question?

Read the scenario before looking for a memorised answer.

About these practice questions

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Same concept, more angles

2 more ways this is tested on 300-410

These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.

Variation 1. What is the default timeout for NAT translation entries in Cisco IOS?

easy

A.60 seconds
B.300 seconds
✓ C.86400 seconds (24 hours)
D.Never expires

Why C: C is correct because the default timeout for NAT translation entries in Cisco IOS is 86400 seconds (24 hours). This default applies to dynamic NAT translations that are not protocol-specific, such as those for TCP or UDP, and ensures that translations remain active for a full day before being aged out, balancing resource usage with session persistence.

Variation 2. In Cisco IOS, what is the default timeout for TCP NAT translations when the TCP session is idle?

medium

A.60 seconds
B.300 seconds
C.3600 seconds
✓ D.86400 seconds

Why D: The correct answer is D (86400 seconds) because Cisco IOS defaults TCP NAT translation timeouts for idle sessions to 24 hours (86400 seconds). This long timeout ensures that established TCP sessions are not prematurely dropped by the NAT device, preserving connectivity for long-lived connections such as database replication or SSH sessions. The timeout is configurable via the 'ip nat translation timeout' command, but the default remains 86400 seconds.

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