EX188 Networking And Compose Practice Question
Two containers running on the same custom user-defined bridge network need to communicate with each other. What built-in mechanism allows them to resolve each other by container name?
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
✓
Automatic DNS resolution provided by the CNI/Netavark network backend
User-defined bridge networks in Podman (backed by CNI or Netavark) provide automatic internal container name resolution through embedded DNS services.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Automatic DNS resolution provided by the CNI/Netavark network backend
Why this is correct
Correct. Custom networks enable built-in DNS name resolution between containers.
- ✗
Static ARP table broadcasting managed by the kernel
Why it's wrong here
Incorrect. ARP does not resolve container names to IP addresses.
- ✗
Multicast DNS (mDNS) running inside every container image by default
Why it's wrong here
Incorrect. Containers do not rely on mDNS out of the box for name resolution.
- ✗
Automatic editing of the host's /etc/hosts file by the Podman daemon
Why it's wrong here
Incorrect. /etc/hosts is not dynamically managed across separate containers this way.
Visual reference
About these practice questions
This EX188 question is part of Courseiva's 301-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 Red Hat exam blueprint
This EX188 practice question is part of Courseiva's free Red Hat 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 EX188 exam.