A customer is installing CX 6300 switches, mobility gateways, and AP-635s. The customer's VoIP system uses both wired and wireless handsets. The handsets are configured to mark voice traffic using a…

Question

Options

• AConfigure Voice Wi-Fi Multimedia Share for DSCP 46 on the voice SSID
• BActivate UCC for the HPE Aruba Networking Central Group managing the APs
• CEnable QoS trust DSCP
• DEnable WMM on the voice SSID

• A
  11% (2)
• B
  6% (1)
• C
  78% (14)
• D
  6% (1)

Explanation

Enabling QoS trust DSCP on the CX 6300 switch instructs it to read and honor the DSCP value (46) already stamped in the IP packet header by the handset, placing traffic in the correct priority queue - without this, the switch ignores DSCP markings and treats the traffic as best-effort regardless of what the endpoint set.

Why the distractors are wrong:

• A (Voice WMM Share / DSCP 46 on SSID): This configures how the AP maps DSCP to WMM access categories on the wireless side - it affects the air link, not how the wired switch processes packets.
• B (Activate UCC): UCC auto-detects and classifies UC traffic that has no existing mark; here the handsets already mark with DSCP 46, so automatic detection adds nothing, and UCC doesn't configure switch port trust.
• D (Enable WMM on SSID): WMM governs QoS priority on the Wi-Fi medium between handset and AP. It's a wireless function and does nothing to change the switch's forwarding behavior.

Memory tip: The question asks what helps the switch - immediately discard any answer scoped to the SSID or AP (A, D). Between B and C, remember: UCC is for traffic that isn't already marked; when endpoints self-mark, you just need the switch to trust the mark → Trust DSCP = C.

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