A technician is installing a switch that will be used for VoIP and data traffic. The phones do not support the 802.3af standard. Which of the following should the technician configure on the switch?

VLANs can logically separate voice and data traffic but do not by themselves apply priority scheduling or bandwidth guarantees needed for VoIP quality.

PoE (802.3af) delivers power over Ethernet to connected devices; since the phones explicitly do not support this standard, configuring PoE on the switch would not benefit them.

VLAN Trunking Protocol (VTP) propagates VLAN configuration between switches and has no bearing on traffic prioritization or VoIP quality.

Quality of Service (QoS) policies on the switch classify and prioritize VoIP packets by marking them with higher DSCP values (e.g., EF - Expedited Forwarding), reducing jitter and latency. Because the phones do not support 802.3af and will use their own power, PoE is irrelevant; the key switch configuration needed is QoS to maintain call quality alongside data traffic.