Cisco
210-060 · Question #110
210-060 Question #110: Real Exam Question with Answer & Explanation
The correct answer is A: jitter detected in voice calls. Sharing a single VLAN for voice and data eliminates QoS separation, allowing bursty data traffic to cause jitter and choppy audio in VoIP calls.
Question
A company has invested in an on-premises VoIP solution. For design simplicity purposes, network engineers have opted to use a single VLAN for both data and voice traffic. Shortly after implementing IP phones, customers are reporting problems. Which two potential problems may be reported about the calls as a result of this design decision? (Choose two.)
Options
- Ajitter detected in voice calls
- Bproblems with email latency
- Cslow internet download speeds
- Dchoppy voice calls
- EPCs are getting IP addresses but phones are not
Explanation
Sharing a single VLAN for voice and data eliminates QoS separation, allowing bursty data traffic to cause jitter and choppy audio in VoIP calls.
Common mistakes.
- B. Email uses TCP with built-in retransmission and flow control and is not adversely affected by the absence of a dedicated voice VLAN; email latency is unrelated to this VoIP design decision.
- C. Internet download speed depends on WAN bandwidth and ISP policies, not on whether voice and data share a LAN VLAN, so this problem would not result from the described design.
- E. Both phones and PCs can receive IP addresses from the same DHCP pool on a single VLAN; IP address assignment failure would indicate a DHCP misconfiguration, not a voice-data VLAN consolidation problem.
Concept tested. Voice VLAN separation and QoS for VoIP traffic
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