Question 950
During a planned campus-network change at an engineering school in Copenhagen, operators discover that a security device changes DSCP unexpectedly and the network team needs to verify the trusted marking boundary. The design must preserve lab networks and WLAN testing. Which post-change observation is the strongest acceptance evidence?
Explanation
Correct Answer
This observation tests the QoS classification and DSCP trust boundaries requirement at an engineering school in Copenhagen. The expected result is that packet markings and egress queue counters match the intended service policy without trusting arbitrary untrusted endpoint marks. The necessary correction is to classify and trust or remark traffic at a documented boundary so approved voice and business applications enter the intended QoS classes; a saved configuration alone would not prove it is working. In this case, the observed fault is that a security device changes DSCP unexpectedly and the network team needs to verify the trusted marking boundary.
Incorrect Answers
At an engineering school in Copenhagen, the observation may be useful for a separate Wireless coverage versus capacity and roaming tuning test, but it does not establish that a security device changes DSCP unexpectedly and the network team needs to verify the trusted marking boundary has been resolved. The relevant check is the QoS classification and DSCP trust boundaries outcome.
At an engineering school in Copenhagen, this measures a different network requirement, Wi-Fi airtime efficiency and data rates. The case describes that a security device changes DSCP unexpectedly and the network team needs to verify the trusted marking boundary, so accepting this result would leave the primary fault without direct verification.
At an engineering school in Copenhagen, this would verify Queue scheduling and congested egress, not the failure reported in this scenario. The requested closure criterion instead concerns QoS classification and DSCP trust boundaries: packet markings and egress queue counters match the intended service policy without trusting arbitrary untrusted endpoint marks.