Engineer Briefing

In the previous mission, you learned why organizations use WANs and explored technologies such as MPLS, VPNs, and SD-WAN.

In this mission, you'll learn how routers communicate across WAN links, how data is encapsulated, the protocols used, and how engineers troubleshoot WAN connectivity.

Mission Objectives

By the end of this mission, students should understand:

• WAN connection components.
• Serial communication.
• WAN encapsulation.
• HDLC.
• PPP.
• PPP authentication.
• Basic WAN troubleshooting.

1. WAN Connection Structure

A WAN connects two or more networks through routers.

Example:

Office A

LAN
 |
Router A
 |
WAN Link
 |
Router B
 |
LAN

Office B

Routers are responsible for:

• Encapsulating data.