Cisco Certified Network Associate (CCNA) Practice Exam

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What must be done to bring the ISP-facing physical interface up in a PPPoE configuration?

shut
no shut
disable
enable interface

The correct answer is: no shut

To bring the ISP-facing physical interface up in a PPPoE configuration, the command "no shut" must be applied to the interface. This command is essential because, by default, Cisco router interfaces are administratively shut down when they are created. Thus, the "no shut" command effectively activates the interface, allowing it to pass traffic and establishing a connection to the ISP. Additionally, in a PPPoE (Point-to-Point Protocol over Ethernet) configuration, activating the physical interface is a prerequisite before the encapsulation can occur, allowing the PPPoE session to be established correctly with the ISP. Ensuring the physical layer is operational is critical for setting up any higher-level protocols that rely on it.