H35-210_V2.5 · Question #57
Which control frame messages are defined by MPCP?
The correct answer is A. GATE B. REPORT C. REGISTER D. REGISTER ACK. All four options are correct because MPCP (Multi-Point Control Protocol), defined in IEEE 802.3ah for Ethernet Passive Optical Networks (EPON), specifies exactly these four control frame types. GATE is sent by the Optical Line Terminal (OLT) to grant upstream transmission time…
Question
Which control frame messages are defined by MPCP?
Options
- AGATE
- BREPORT
- CREGISTER
- DREGISTER ACK
How the community answered
(47 responses)- A100% (47)
Explanation
All four options are correct because MPCP (Multi-Point Control Protocol), defined in IEEE 802.3ah for Ethernet Passive Optical Networks (EPON), specifies exactly these four control frame types. GATE is sent by the Optical Line Terminal (OLT) to grant upstream transmission time slots to Optical Network Units (ONUs). REPORT is sent by ONUs back to the OLT to communicate queue lengths and buffer status, enabling the OLT to make scheduling decisions. REGISTER and REGISTER ACK are used during the auto-discovery and ranging process that allows new ONUs to join the network and synchronize timing. Since this is an all-of-the-above scenario, there are no incorrect distractors - each option names a real and distinct MPCP frame type with a defined role in point-to-multipoint coordination.
Memory tip: Think of the lifecycle - an ONU REGISTERS to join, the OLT sends a REGISTER ACK to confirm, the ONU sends REPORTs on its queue, and the OLT issues GATEs to schedule transmissions. That sequence covers all four frames in logical order.
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