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300-410 Practice Question: Which THREE commands can be used to troubleshoot…
Which THREE commands can be used to troubleshoot NAT issues on a Cisco IOS router? (Choose THREE.)
⚠ Common exam trap
Cisco often tests the distinction between valid troubleshooting commands and commands that sound plausible but are either nonexistent or irrelevant to the specific technology, such as 'show ip nat verbose' or 'show ip interface brief'.
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
✓
show ip nat translations
A is correct because 'show ip nat translations' displays the current NAT translation table, showing inside local, inside global, outside local, and outside global addresses. This command is essential for verifying whether translations are being created correctly and for identifying translation mismatches or exhaustion.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
show ip nat translations
Why this is correct
Displays active translations, which helps verify if mappings are created correctly.
- ✓
debug ip nat
Why this is correct
Provides real-time output of NAT translation events, useful for seeing if packets are being translated.
- ✓
clear ip nat translation
Why this is correct
Clears dynamic translations, which can resolve stuck entries or test new configurations.
- ✗
show ip nat verbose
Why it's wrong here
Not a valid Cisco IOS command; the verbose option is used with show ip nat translations.
- ✗
show ip interface brief
Why it's wrong here
Shows interface status and IP addresses, but does not provide NAT-specific information.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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