AI-200 Security And Observability Practice Question
You have configured distributed training for a large language model across multiple nodes in an Azure Machine Learning cluster. Training jobs are failing with socket timeout errors between nodes. You need to verify internal node-to-node communication and ensure that the underlying Network Security Group (NSG) rules permit communication on the required ports. Which ports must be open between nodes in the cluster?
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
✓
TCP ports 443, 22, and custom high-range ports (e.g., 40000-49999) for MPI distributed training communication
Azure Machine Learning compute clusters require specific ports (such as ports 443, 22, and a range for MPI communication like ports 40000-49999) for inter-node communication.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
TCP ports 443, 22, and custom high-range ports (e.g., 40000-49999) for MPI distributed training communication
Why this is correct
Correct. Distributed training frameworks like MPI require high-range TCP ports for inter-node communication.
- ✗
Port 1433 for SQL Server database communication
Why it's wrong here
Incorrect. Port 1433 is for SQL Server and irrelevant to ML training cluster node communication.
- ✗
Port 3389 exclusively for Remote Desktop protocol across Linux nodes
Why it's wrong here
Incorrect. Linux compute nodes do not use RDP (port 3389) for distributed training.
- ✗
Only port 80 and port 443 for standard web traffic
Why it's wrong here
Incorrect. Standard web ports are insufficient for distributed cluster node-to-node communication.
About these practice questions
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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 Microsoft exam blueprint
This AI-200 practice question is part of Courseiva's free Microsoft 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 AI-200 exam.