easyMultiple ChoiceObjective-mapped
300-410 Practice Question: Runs the following command on Router R1: R1# show…
A network engineer runs the following command on Router R1:
R1# show ip nat translations
Pro Inside global Inside local Outside local Outside global udp 192.0.2.10:10000 10.0.0.10:10000 203.0.113.5:53 203.0.113.5:53 udp 192.0.2.10:10001 10.0.0.11:10000 203.0.113.5:53 203.0.113.5:53 udp 192.0.2.10:10002 10.0.0.12:10000 203.0.113.5:53 203.0.113.5:53
R1# show ip nat statistics
Total active translations: 3 (0 static, 3 dynamic; 3 extended) Outside interfaces: GigabitEthernet0/1 Inside interfaces: GigabitEthernet0/0 Hits: 150 Misses: 0 CEF Translated packets: 150, CEF Punted packets: 0 Expired translations: 0 Dynamic mappings: -- Inside Source
[Id] ip nat inside source list ACL1 interface GigabitEthernet0/1 overload
refcount 3
Based on this output, which statement is correct?
⚠ Common exam trap
Cisco often tests the distinction between PAT (overload) and basic NAT (pool without overload), and candidates may mistakenly think that multiple translations to the same destination (203.0.113.5:53) indicate a pool exhaustion or static NAT, when in fact the unique source ports confirm PAT is functioning correctly.
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
✓
PAT is working correctly; multiple inside hosts share the same global address with unique ports.
The output shows three dynamic NAT translations, all using the same inside global address 192.0.2.10 with unique source ports (10000, 10001, 10002). This is the hallmark of Port Address Translation (PAT) or NAT overload, where multiple inside hosts (10.0.0.10, 10.0.0.11, 10.0.0.12) share a single public IP address by differentiating sessions via layer-4 port numbers. The 'overload' keyword in the dynamic mapping confirms PAT is active and working correctly.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
PAT is working correctly; multiple inside hosts share the same global address with unique ports.
Why this is correct
The translations show different source ports for each inside host, and the mapping uses interface overload. Hits indicate successful translation.
- ✗
The NAT pool is exhausted because all addresses are used.
Why it's wrong here
Only one global address is used (the interface address), and PAT allows sharing.
- ✗
Static NAT is configured for DNS traffic.
Why it's wrong here
No static translations are present.
- ✗
The inside and outside interfaces are swapped.
Why it's wrong here
The statistics show correct interface assignment.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This 300-410 practice question is part of Courseiva's free Cisco certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the 300-410 exam.