300-120 WLSI: Implementing Cisco Wireless Advanced Solutions

By Cisco · Question Mode

QuestionQ46

QoS on a Wireless Network

A network engineer wants to implement QoS across a network that supports multiple VLANs. All APs connect to switch ports and are configured in local mode.

Which trust model must be configured on the switch ports to which the APs connect?

Explanation

DSCP is correct because a local-mode AP sends client traffic to the controller through CAPWAP, and the AP-facing access port must trust the DSCP marking of those packets so the switch can classify and queue them appropriately. CoS is the strongest distractor, but 802.1p CoS is carried in an 802.1Q VLAN tag and is appropriate for relevant trunk links; local-mode AP switch ports are access ports and must use mls qos trust dscp.

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