MS-700 Monitor, Report on, and Troubleshoot Teams Practice Question
You suspect that an internal network firewall is blocking Teams media traffic. Which specific ports must be open for UDP traffic to ensure optimal Teams media performance?
⚠ Common exam trap
MS-700 often tests the confusion between signaling ports (TCP 443) and media ports (UDP 3478-3481), and candidates incorrectly select TCP 443 thinking it covers all Teams traffic.
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
✓
UDP 3478-3481
Microsoft Teams media traffic relies on UDP ports 3478 through 3481 for real-time audio, video, and screen sharing, with these ports used for STUN/TURN and media relay. Opening this UDP range ensures optimal media performance by allowing direct or relayed media paths. TCP 443 is used for signaling and fallback, but UDP is preferred for latency-sensitive media.
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 443
Why it's wrong here
While TCP 443 is required for signaling and metadata, it is not the primary port for media traffic. Relying on TCP for audio and video media streams causes significant latency and packet loss, leading to a poor user experience compared to the preferred UDP-based transmission.
- ✓
UDP 3478-3481
Why this is correct
These UDP ports are strictly required by the Teams client to facilitate media streams for audio, video, and screen sharing. Blocking these ports forces the application to use less efficient fallback mechanisms, which directly results in poor call quality and performance issues for users.
- ✗
TCP 80
Why it's wrong here
TCP port 80 is used for unencrypted HTTP traffic and is not used by Microsoft Teams. Modern web traffic and all Teams-related communication are encrypted over HTTPS (TCP 443), so opening or monitoring port 80 is unnecessary and does not impact Teams media performance.
- ✗
UDP 53
Why it's wrong here
UDP 53 is reserved for DNS traffic. While DNS resolution is necessary for the client to find the Microsoft servers, this port is not used for media traffic. Opening this port will not resolve performance issues related to audio, video, or screen sharing quality.
About these practice questions
One of 211 original MS-700 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 and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed September 2026 · checked against the official Microsoft exam blueprint
This MS-700 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 MS-700 exam.