CCNA 200-125 Exam: PPPoE Questions With Answers

  1. Which part of the PPPoE server configuration contains the information used to assign an IP address to a PPPoE client?
    • A. virtual-template interface*
    • B. DHCP
    • C. dialer interface
    • D. AAA authentication

    Show (Hide) Explanation/Reference
    The picture below shows all configuration needed for PPPoE:

    CCNA 200-125 Exam: PPPoE Questions With Answers 1

    There is no Dialer interface on the PPPoE Server so answer “Dialer interface” is not correct. The most suitable answer is “Virtual Template” interface as it contains the pool which is used to assign IP address to the PPPoE Client. But this question is weird because according to the CCNAv3 syllabus, candidates only need to grasp the PPPoE on client-side, not sure why this question asked about PPPoE on Server side. For more information about PPPoE, please read our PPPoE tutorial.

  2. 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

    Show (Hide) 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.


  3. Which type of interface can negotiate an IP address for a PPPoE client?
    • A. Ethernet
    • B. dialer*
    • C. serial
    • D. Frame Relay

    Show (Hide) Explanation/Reference
    In the Dialer interface, we can use the “ip address negotiated” command to ask for an IP address from the PPPoE Server.

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