200-901 Application Deployment and Security Practice Question
In a Docker bridge network, two containers can communicate with each other using which identifier by default?
⚠ Common exam trap
Candidates often assume that Docker always resolves container names, but this only applies to user-defined networks, not the default bridge.
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
✓
Their IP addresses only
On the default Docker bridge network, DNS resolution for container names is not provided. Therefore, containers can only communicate using IP addresses by default. User-defined bridge networks enable name resolution.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Their IP addresses only
Why this is correct
Correct. On the default bridge network, only IP addresses can be used for communication.
- ✗
Their image names
Why it's wrong here
Incorrect. Image names are not network identifiers.
- ✗
Their container names
Why it's wrong here
Incorrect. Container names are only resolved on user-defined bridge networks, not the default bridge.
- ✗
Their MAC addresses
Why it's wrong here
Incorrect. MAC addresses are used at layer 2 but not as direct identifiers for communication in this context.
Visual reference
Go deeper
Related to this question
About these practice questions
One of 989 original 200-901 practice questions on Courseiva, each with a full explanation and wrong-answer analysis — not exam dumps or protected exam content. Learn why practice questions differ from exam dumps →
JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This 200-901 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 200-901 exam.