305-300 Container Virtualization Practice Question
A Docker container is failing to connect to an external database despite the host being able to ping it. You suspect a bridge networking issue. Which command allows you to inspect the current NAT rules created by Docker?
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
✓
iptables -t nat -L -n
Docker manages iptables rules for container networking.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
docker network inspect bridge
Why it's wrong here
This shows logical network info, not actual netfilter kernel rules.
- ✓
iptables -t nat -L -n
Why this is correct
Docker adds rules to the NAT table for port forwarding and masquerading.
- ✗
ip link show docker0
Why it's wrong here
This shows interface status, not firewall rules.
- ✗
sysctl -a | grep net.bridge
Why it's wrong here
This shows sysctl bridge kernel parameters, not NAT rules.
Visual reference
About these practice questions
This 305-300 question is part of Courseiva's 194-question bank — original exam-style content with full explanations and wrong-answer analysis, never real exam questions or exam dumps. Learn why practice questions differ from exam dumps →
JA
Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed August 2026 · checked against the official LPI exam blueprint
This 305-300 practice question is part of Courseiva's free LPI 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 305-300 exam.