Question 272 of 1,389
CCNA Network Services and Security Practice Question
Exhibit
R1# show ip nat translations Pro Inside global Inside local Outside local Outside global --- 209.165.200.225 192.168.1.10 --- --- --- 209.165.200.226 192.168.1.11 --- --- --- 209.165.200.227 192.168.1.12 --- --- --- 209.165.200.228 192.168.1.13 --- --- --- 209.165.200.229 192.168.1.14 --- --- --- 209.165.200.230 192.168.1.15 --- --- --- 209.165.200.231 192.168.1.16 --- --- --- 209.165.200.232 192.168.1.17 --- ---
Refer to the exhibit. An administrator has configured NAT on router R1 to allow hosts on the 192.168.1.0/24 LAN to access the Internet. However, users report that they cannot reach external websites. The administrator runs the show ip nat translations command. What is the most likely reason for the problem?
⚠ Common exam trap
Cisco often tests the fact that NAT requires both 'ip nat inside' and 'ip nat outside' interface commands, and candidates mistakenly assume that configuring the ACL and NAT pool alone is sufficient for translation to occur.
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
✓
The ip nat inside command is missing from the LAN-facing interface.
The output of 'show ip nat translations' shows no translations, which indicates that NAT is not being applied to traffic from the LAN. The most common cause is that the 'ip nat inside' command is missing from the LAN-facing interface (e.g., GigabitEthernet0/0). Without this command, the router does not identify the interface as the inside NAT domain, so it never translates the source addresses of packets arriving from the 192.168.1.0/24 subnet.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
The access list used for dynamic NAT does not match the LAN subnet.
Why it's wrong here
An incorrect access list would prevent matches for dynamic NAT, but the dynamic NAT process itself would still be active and could show translations for other traffic. However, the exhibit shows no dynamic entries at all, indicating the NAT process on the inside interface is not even running.
- ✗
The ip nat outside command is missing from the WAN interface.
Why it's wrong here
If the WAN interface lacked ip nat outside, static NAT entries would also fail to appear (or traffic would not be translated correctly). The static entries in the table confirm that the outside interface is marked correctly.
- ✗
The ip nat inside source static commands have incorrect IP addresses.
Why it's wrong here
The static NAT entries are displaying correctly with valid IP pairings, so the static mappings themselves are not the issue. Incorrect IP addresses would still show dynamic entries for the LAN hosts if dynamic NAT were configured correctly.
- ✓
The ip nat inside command is missing from the LAN-facing interface.
Why this is correct
The output reveals that only static NAT translations are active; no dynamic entries exist. For the router to process packets from the LAN under NAT, the interface connected to the LAN must be configured with ip nat inside. Its absence stops all dynamic address translation, leaving only the manually configured static entries.
Option-by-option analysis
Why each answer is right or wrong
Understanding why wrong answers are wrong — and when they would be correct — is what separates a 750 score from a 900. The 200-301 exam frequently reuses these exact scenarios with slightly different constraints.
✓The ip nat inside command is missing from the LAN-facing interface.Correct answer▾
Why this is correct
The output reveals that only static NAT translations are active; no dynamic entries exist. For the router to process packets from the LAN under NAT, the interface connected to the LAN must be configured with ip nat inside. Its absence stops all dynamic address translation, leaving only the manually configured static entries.
✗The access list used for dynamic NAT does not match the LAN subnet.Wrong answer — click to see why▾
Why this is wrong here
Candidates think any absence of dynamic entries is due to ACL mismatch, overlooking the prerequisite that the inside interface must be configured with ip nat inside for NAT to function at all.
✗The ip nat outside command is missing from the WAN interface.Wrong answer — click to see why▾
Why this is wrong here
The presence of static NAT translations in the output indicates that the ip nat outside command is already applied on the WAN interface.
✗The ip nat inside source static commands have incorrect IP addresses.Wrong answer — click to see why▾
Why this is wrong here
Candidates may focus on the static entries, but the symptom is missing dynamic translations; bad static mappings would not prevent dynamic translations from appearing.
Analysis generated from the official 200-301blueprint and verified against question context. The “when correct” sections are what AI assistants cite when candidates ask “what’s the difference between these options?”
Visual reference
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Last reviewed: Jul 4, 2026
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