What is the default encapsulation for serial interfaces on a Cisco router?
- HDLC
- PPP
- Frame Relay
- X.25
Explanation: Cisco HDLC is the default encapsulation method used by Cisco devices on synchronous serial lines.
Related exam: EWAN v4 Chapter 2 Check Your Understanding: PPP
Related exam: CCNA 4 Exploration v4.0 Chapter 2 Quiz
