PCQ (Per Connection Queue) is used in MikroTik to enforce bandwidth fairness across multiple users. To limit each client to 256k:
* pcq-rate=256000 # sets maximum bandwidth per client to 256,000 bps (256 kbps)
* pcq-classifier=src-address # used in upload queues
* pcq-classifier=dst-address # used in download queues
So:
* A.#Used for upload: src-address
* C.#Used for download: dst-address
The other options have incorrect rates or classifiers:
* B.#Incorrect rate (1256000 # 256k)
* D & E.#Incorrect rate (5000000 = 5 Mbps)
MTCNA Course Manual - PCQ Explanation:
"Use pcq-classifier=src-address for upload, and dst-address for download. pcq-rate sets per-client limit." Rene Meneses Study Guide - Queue Management:
"To cap clients to 256k, configure pcq-rate=256000. Adjust classifiers based on traffic direction." Terry Combs Notes - PCQ Parameters:
"Classifier is the key. src-address = upload, dst-address = download. Don't mix."