Cisco Certified Network Associate (CCNA) Practice Exam

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What is the purpose of Point to Point Protocol over Ethernet (PPPoE)?

To establish point-to-point connections over serial links
To provide a method for encapsulating Ethernet frames
To connect DSL modems to routers using Ethernet links
To configure wide area network connections

The correct answer is: To connect DSL modems to routers using Ethernet links

The purpose of Point to Point Protocol over Ethernet (PPPoE) is to connect DSL modems to routers using Ethernet links. PPPoE serves as a network protocol designed to encapsulate Point-to-Point Protocol (PPP) frames within Ethernet frames. This is particularly useful because many DSL service providers utilize PPP to manage and authenticate connections, allowing users to connect to the Internet. When a DSL modem is connected to a router using Ethernet, PPPoE facilitates this by allowing the router to manage multiple client connections over the same Ethernet link. Essentially, PPPoE acts as a bridge between the Ethernet network and the WAN provided by the DSL connection, enabling features like user authentication, session management, and IP address assignment. In this context, the other options do not align with the functionality of PPPoE. While it encapsulates frames, it is not specifically designed to provide a method for general Ethernet frame encapsulation nor is it primarily for establishing point-to-point connections over serial links or configuring wide area network connections. Its utility is ultimately centered on the DSL connection scenario, making it essential for users needing to link their home or business networks to Internet service through DSL technology.