Lesson 4 - HDLC Protocol

   Introduction

WAN technologies and their corresponding protocols are used where geographically dispersed networks and subnetworks need to be interconnected. This lesson covers HDLC, on which other protocols, such as PPP, are based.

   Objectives

At the end of this lesson you should be able to:

1.	Describe basic High-level Data Link (HDLC) communication
2.	Understand HDLC commands and frame format

Key Point
Several WAN protocols, such as PPP and frame relay, are based on HDLC.

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