What is the correct order for the PPPoE discovery stage?

In the context of PPPoE (Point-to-Point Protocol over Ethernet), the discovery stage follows a specific sequence to establish a connection between a client and a server. The correct order begins with Initialization, where the client sends a PADI (PPPoE Active Discovery Initiation) packet to discover available PPPoE servers. Following this, the Offer stage occurs, during which the server responds with a PADO (PPPoE Active Discovery Offer) packet, indicating that it is available for a connection.

Once the client receives the Offer, it will proceed with the Request stage by sending a PADR (PPPoE Active Discovery Request) to the selected server, indicating the client's intent to establish a session. Finally, the Session confirmation stage is completed when the server sends a PADS (PPPoE Active Discovery Session-confirmation) packet back to the client, concluding the discovery process and confirming that the session is established.

This structured sequence ensures that both the client and server properly negotiate and establish a connection, laying the groundwork for reliable data transmission over the network. Other responses do not follow this exact order, which is fundamental to the PPPoE discovery process.