350-801 Question #79: Real Exam Question with Answer & Explanation

Question

what causes poor voice quality and video pixelization in a video call?

Options

• ACisco Unified Communications Manager is configured to use G.711 instead G.729.
• B1 Gbps network ports are used instead of 100 Mbps network ports.
• CThe QoS is configured incorrectly.
• DA firewall is blocking the RTP ports.

Explanation

This question asks for the primary cause of poor voice quality and video pixelization in a video call.

Common mistakes.

• A. G.711 is a higher bandwidth codec than G.729 and typically offers better voice quality, so using G.711 would generally improve, not worsen, voice quality.
• B. Using 1 Gbps network ports instead of 100 Mbps ports provides more bandwidth, which would generally improve, not degrade, voice and video quality.
• D. A firewall blocking RTP ports would typically prevent calls from establishing or result in one-way audio/video, rather than causing poor quality or pixelization in an active call.

Concept tested. Impact of QoS on real-time media quality

Reference. https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/srnd/collab12/collab12/quality.html

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