350-801 · Question #68
350-801 Question #68: Real Exam Question with Answer & Explanation
The correct answer is D: Excessive jitter. Without Quality of Service (QoS) deployed on a WAN, real-time collaboration traffic like voice and video can suffer from excessive jitter, latency, and packet loss due to network congestion, leading to poor call quality.
Question
Which issue can occur if QoS is not Deployed on a Cisco Collaboration architecture across the WAN?
Options
- AUnexpected shut-down on Cisco Unified Communications Manager
- BPacket fragmentation
- C403 Forbidden errors on SIP calls
- DExcessive jitter
Explanation
Without Quality of Service (QoS) deployed on a WAN, real-time collaboration traffic like voice and video can suffer from excessive jitter, latency, and packet loss due to network congestion, leading to poor call quality.
Common mistakes.
- A. An unexpected shutdown on Cisco Unified Communications Manager is typically caused by software defects, hardware failures, or resource exhaustion, not directly by a lack of QoS on the WAN.
- B. Packet fragmentation can occur due to MTU mismatches but is not a direct consequence of lacking QoS; QoS primarily addresses prioritization and bandwidth management, not fragmentation prevention.
- C. 403 Forbidden errors on SIP calls are related to authorization or authentication issues, indicating a call is rejected due to policy, not a lack of QoS.
Concept tested. QoS impact on real-time traffic
Reference. https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/srnd/collab12/collab12/qos.html
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