Which three statements describe functions of the Point-to-Point Protocol with regards to the OSI model?(Choose three.)

Which three statements describe functions of the Point-to-Point Protocol with regards to the OSI model?(Choose three.)

• operates at all layers of the OSI model
• provides a mechanism to multiplex several network layer protocols
• can be configured on both synchronous and asynchronous serial interfaces
• uses Layer 3 of the OSI model to establish and maintain a session between devices
• uses the data link layer to configure such options as error detection and compression
• uses network control protocols to test and maintain connectivity between devices

Exam with this question: CCNA Discovery 3: DRSEnt Chapter 7 Exam