Question 460
A multicast television service requires priority over nightly snapshots. Observed: Multicast video packets are assigned to the lowest-priority class after a classifier update. Which change-acceptance control is most relevant to preventing this exact failure?
Explanation
Correct Answer
The control is specific to the initial failure. It requires the result Multicast packets land in the approved class and video impairment disappears. and treats Multicast video packets are assigned to the lowest-priority class after a classifier update. as a failure signal. The causal concern is the updated dscp-to-forwarding-class table misses the multicast source marking.
Incorrect Answers
It is valid for another service scenario but checks downstream peers see markings unchanged while reverse traffic is altered unexpectedly. This case instead needs a gate for multicast video packets are assigned to the lowest-priority class after a classifier update and evidence that multicast packets land in the approved class and video impairment disappears.
The proposed control is tied to no separate class queue protects delay-sensitive packets from serialization backlog, typically observed when a single FIFO queue holds both low-latency and bulk data traffic. Here the target is the updated dscp-to-forwarding-class table misses the multicast source marking; monitor multicast packets land in the approved class and video impairment disappears.
This gate monitors a different failure, both important and disposable video packets are dropped equally in congestion. It would not detect the current problem: Multicast video packets are assigned to the lowest-priority class after a classifier update. The appropriate check requires multicast packets land in the approved class and video impairment disappears.