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300-410 Practice Question: Runs the following command to troubleshoot a NAT…
A network engineer runs the following command to troubleshoot a NAT issue:
R1# debug ip nat detailed
NAT: s=10.1.1.1->10.2.2.2, d=192.168.1.1 [45] NAT: s=10.1.1.1->10.2.2.2, d=192.168.1.1 [46] NAT: s=10.1.1.1->10.2.2.2, d=192.168.1.1 [47] NAT*: s=192.168.1.1, d=10.2.2.2->10.1.1.1 [48] NAT: s=10.1.1.1->10.2.2.2, d=192.168.1.1 [49]
What does this output indicate?
⚠ Common exam trap
Cisco often tests the misconception that the asterisk in NAT debug output indicates a problem or drop, when in fact it confirms fast-switched translation and successful bidirectional NAT operation.
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
✓
NAT is working correctly; the asterisk indicates a packet that was translated and fast-switched.
The output shows successful NAT translations: the source IP 10.1.1.1 is translated to 10.2.2.2 for outbound packets (lines without asterisk), and the return packet from 192.168.1.1 has its destination translated back to 10.1.1.1 (line with asterisk). The asterisk in 'NAT*' indicates that the packet was both translated and fast-switched (process-switched packets lack the asterisk), confirming correct operation.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
NAT is working correctly; the asterisk indicates a packet that was translated and fast-switched.
Why this is correct
The asterisk shows fast-switching, and translations are occurring bidirectionally.
- ✗
NAT is failing; the asterisk indicates a packet that was dropped.
Why it's wrong here
The asterisk does not indicate a drop; it indicates fast-switching.
- ✗
NAT is working but only for outbound traffic; return traffic is not being translated.
Why it's wrong here
Return traffic is being translated, as seen in line 4.
- ✗
NAT is not configured; the output shows only routing information.
Why it's wrong here
The output clearly shows NAT translations.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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