The queue's buffer allocation consists of a committed (reserved) portion and a shared portion. The Committed Burst Size (CBS) of 5KB defines the reserved portion. Since the current queue depth is 8KB, this reserved portion is already fully utilized.

The queue can continue to accept packets into the shared buffer portion until it reaches its Maximum Burst Size (MBS) of 10KB. The arriving packet is "in-profile," which is treated as high-priority for queue admission. Although the queue depth (8KB) has exceeded the High-Priority-Only threshold (30% of 10KB = 3KB), high-priority (in-profile) packets are still accepted. Therefore, the packet is queued in the shared portion of the buffer pool, where it contends for resources with other queues.

A. The High-Priority-Only threshold only causes the discard of low-priority or out-of-profile packets, not in-profile (high-priority) packets.

B. Packet marking (in-profile vs. out-of-profile) is determined by ingress policing/metering, not by the egress queue depth. The queue does not re-mark packets.

C. The reserved (CBS) portion of the buffer is only 5KB. With a current depth of 8KB, this portion is already full, so the packet cannot be placed there.

E. The question explicitly states that the slope-policy is disabled, meaning WRED is not active. Therefore, slope parameters like start-average are not considered for dropping packets.

1. Nokia 7750 SR OS Quality of Service Guide, Release 21.10.R1, Document Number: 3HE 17279 AAAA TQZZA 01

Section: Queue Buffers: "After a queue’s CBS is exceeded, the queue competes with other queues for the remaining shared buffers up to its Maximum Burst Size (MBS)." This supports the packet being placed in the shared portion.

Section: High-Priority-Only Buffers: "The high-prio-only parameter specifies the percentage of the queue’s MBS that is reserved for high-priority packets... When the queue depth exceeds this threshold, only high-priority packets can be buffered. Low-priority and out-of-profile packets are discarded." This confirms that the in-profile (high-priority) packet will be accepted even though the threshold is crossed.

Section: In-Profile and Out-of-Profile Packets: "Packets are marked in-profile or out-of-profile based on the service’s CIR. In-profile packets have a preferential opportunity to be enqueued." This establishes the link between "in-profile" and "high-priority" for queue admission.