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350-701 Practice Question: Is troubleshooting an issue where users on VLAN…
A network engineer is troubleshooting an issue where users on VLAN 10 cannot access the internet, but they can reach internal resources. The firewall is configured with a default route pointing to the ISP router. The engineer notices that NAT is configured but traffic is not being translated. Which configuration is most likely missing?
⚠ Common exam trap
Cisco often tests the misconception that simply enabling NAT or PAT is enough, but the ACL is the critical component that defines the traffic to be translated, and candidates may overlook it because they assume NAT applies to all traffic by default.
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
✓
An ACL to match the traffic to be translated
For NAT to translate traffic, the firewall must know which traffic to translate. An ACL is used to match the source IP addresses (or networks) that should be translated. Without an ACL applied to the NAT rule, the firewall has no criteria to identify traffic from VLAN 10 for translation, so packets are forwarded without NAT, causing internet access to fail while internal routing works.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
An ACL to match the traffic to be translated
Why this is correct
The ACL defines interesting traffic for NAT; without it, no packets are matched for translation.
- ✗
A NAT pool with available public IP addresses
Why it's wrong here
A NAT pool is needed for dynamic NAT, but the immediate issue is the missing ACL to match traffic.
- ✗
Port Address Translation (PAT) configuration
Why it's wrong here
PAT is a type of NAT, but the missing element is the ACL to identify traffic for translation.
- ✗
A route map to apply NAT based on destination
Why it's wrong here
Route maps are optional for policy-based NAT; standard NAT requires an ACL first.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This 350-701 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 350-701 exam.