Which statement is true about the HDLC protocol?

The statement that HDLC encapsulates data link layer frames is accurate. HDLC, or High-Level Data Link Control, is a data link layer protocol that provides reliable communication between network devices. It is designed to encapsulate packets into frames for transmission across various types of physical networks. This encapsulation process includes adding headers and trailers that contain control information necessary for error detection and frame synchronization.

HDLC operates on the data link layer of the OSI model, which ensures that data packets are transmitted without errors between the directly connected devices. It supports both point-to-point and point-to-multipoint configurations, but its primary function is to manage the framing of data for communication. Thus, its role in encapsulation is fundamental to ensuring reliable data transmission within networks that utilize HDLC frames for communication.