County VoIP markings remain correct inside the campus, but quality collapses across the WAN after a firewall at the edge rewrites DSCP to zero. What QoS design issue does this reveal?
Select an answer to reveal the explanation.
Short Explanation
QoS sticky notes only help if nobody peels them off at the door. If the WAN-edge firewall zeros DSCP, the far side treats voice like bulk. Fix the trust boundary—preserve or remark on purpose, don’t accidentally bleach the markings.
Full Explanation
Trust boundaries define where DSCP/CoS is accepted, cleared, or remarked. Unintentional stripping at a WAN-edge firewall destroys end-to-end prioritization even when campus WMM/DSCP mapping is correct. Policy should explicitly preserve EF (or remark consistently) across the boundary. WMM-AC on guest, OFDMA myths, and beacon timing are unrelated to this failure.