CISSP Practice Exam 2025 – Complete Prep Guide

High-level Data Link Control (HDLC) serves as a data link layer protocol, providing reliable and efficient communication between devices over point-to-point and point-to-multipoint links. One of its key attributes is that it is indeed a successor to the Synchronous Data Link Control (SDLC), which was developed by IBM. HDLC enhances and improves upon the features offered by SDLC, making it more versatile for various types of communication networks.

HDLC supports multiple types of data transfer modes, including bit-oriented protocol communication, which allows it to manage frame formats, error detection, and control flow. This expanded functionality enables HDLC to operate effectively in different networking environments compared to its predecessor, SDLC.

By understanding the relationship between HDLC and SDLC, it's clear that HDLC is built to accommodate the growing complexity of data communications and to provide a more robust communication framework.