PPPoE is composed of which two phases?

PPPoE is composed of which two phases?
A . Active Authentication Phase and PPP Session Phase
B . Passive Discovery Phase and PPP Session Phase
C . Active Authorization Phase and PPP Session Phase
D . Active Discovery Phase and PPP Session Phase

Answer: D

Explanation:

PPPoE is composed of two main phases: Active Discovery Phase ― In this phase, the PPPoE client locates a PPPoE server, called an access concentrator. During this phase, a Session ID is assigned and the PPPoE layer is established. PPP Session Phase ― In this phase, PPP options are negotiated and authentication is performed. Once the link setup is completed, PPPoE functions as a Layer 2 encapsulation method, allowing data to be transferred over the PPP link within PPPoE headers.

Reference: http://www.cisco.com/c/en/us/td/docs/security/asa/asa92/configuration/vpn/asa-vpn-cli/ vpnpppoe. html