Cisco
300-365 · Question #27
300-365 Question #27: Real Exam Question with Answer & Explanation
The correct answer is A: VoiceVLAN. The Voice VLAN (Auxiliary VLAN) switch feature instructs a Cisco IP phone via CDP to tag its voice frames with a dedicated VLAN ID while passing attached PC data traffic untagged on the native VLAN.
Wireless Deployment
Question
The customer has deployed C7960 phones with clients connected to them. What switch feature could be enabled to distinguish IP voice traffic from client data traffic?
Options
- AVoiceVLAN
- BQoS routing
- CWME
- DWeighted Queuing
- EQBSS
Explanation
The Voice VLAN (Auxiliary VLAN) switch feature instructs a Cisco IP phone via CDP to tag its voice frames with a dedicated VLAN ID while passing attached PC data traffic untagged on the native VLAN.
Common mistakes.
- B. QoS routing is a WAN routing technique for selecting paths based on traffic class, not a switch port feature for separating voice and data VLANs.
- C. WME (Wi-Fi Multimedia Extensions, 802.11e) is a wireless QoS mechanism and is not applicable to wired switch port configurations.
- D. Weighted Queuing is a QoS scheduling mechanism for managing egress queue priority and does not separate traffic into distinct VLANs.
- E. QBSS (QoS Basic Service Set) is a wireless 802.11e load information element used by APs and is unrelated to wired switch port voice segmentation.
Concept tested. Switch Voice VLAN configuration for IP phone traffic separation
Topics
#Voice VLAN#IP telephony#switch configuration#QoS
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