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During which phase of PPPoE is PPP authentication performed?

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During which phase of PPPoE is PPP authentication performed? 

A. the PPP Session phase 
B. Phase 2 
C. the Active Discovery phase 
D. the Authentication phase 
E. Phase 1 

Correct Answer: A 
Explanation 
Explanation/Reference:PPPoE provides a standard method of employing the authentication methods of the Point-to-Point Protocol (PPP) over an Ethernet network. When used by ISPs, PPPoE allows authenticated assignment of IP addresses. In this type of implementation, the PPPoE client and server are interconnected by Layer 2 bridging protocols running over a DSL or other broadband connection. 
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.

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PPP authentication performed

During which phase of PPPoE is PPP authentication performed?
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