In the PPPoE client example, what is the effect of add-default-route=yes?

• A. It sets DNS server
• B. It creates a backup
• C. It adds a default route through the PPPoE interface
• D. It enables remote management

Answer: (C)

The setting add-default-route=yes makes the PPPoE connection the path for all internet-bound traffic by automatically creating a default route through the PPPoE interface when the session comes up. The default route means any destination not covered by a more specific route will be sent via the PPPoE link (0.0.0.0/0 through the PPPoE interface’s gateway). This ensures outbound traffic uses the PPPoE connection by default. It doesn’t configure DNS, it isn’t about backups, and it doesn’t enable remote management; those functions are handled separately. If the PPPoE session drops, the default route typically disappears, so traffic would stop flowing until the link is restored or another route takes over.