| Exam 200-120 | Question id=70 | WAN Technologies |
Which Layer 2 protocol encapsulation supports asynchronous and synchronous circuits and has builtin security mechanisms?
| A. |
HDLC | |
| B. |
PPP | |
| C. |
X.25 | |
| D. |
Frame Relay | |
| E. |
VPN |
Point-to-Point Protocol (PPP) - Provides router-to-router and host-to-network connections over synchronous and asynchronous circuits. PPP was designed to work with several network layer protocols, such as IP, and IPX. PPP also has built in security mechanisms such as PAP and CHAP.