A. Access layer switches should support 802.1Q trunking and 802.1p for Layer 2 CoS packet marking on Layer 2 ports with IP phones connected.
B. Combining voice and data and a single VLAN simplifies QoS trust boundaries, VLAN access control, and ease of management.
C. Data devices will also require access to priority queues via packet tagging.
D. Fixed network delays (serialization, propagation, and so on) are generally unpredictable and more difficult to calculate than variable network delays.
Correct Answer: A
Section: Voice Video
802.1Q & 802.1P are required for Vlan tagging & prioritizing voice frames.
- CCIE Lab Workbook
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- CCNA Exam Workbook
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- CCNA Course Study Guide
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