Difference Between High-level Data Link Control (HDLC) and Point-to-Point Protocol (PPP)
The main difference between High-level Data Link Control (HDLC) and Point-to-Point Protocol (PPP) is that High-level Data Link Control is the bit-oriented protocol, on the other hand, Point-to-Point Protocol is the byte-oriented protocol. Another difference between HDLC and PPP is that HDLC is implemented by Point-to-point configuration and also multi-point configurations on the other hand While PPP is implemented by Point-to-Point configuration only. 
Let’s see the difference between HDLC and PPP:
| S. No. | Parameters | HDLC | PPP |
|---|---|---|---|
| 1. | Basics | HDLC is an ISO-developed bit-oriented code-transparent synchronous data link layer protocol. | PPP is a data link layer communication protocol for establishing a direct link between two nodes. |
| 2. | Stands for | HDLC stands for High-level Data Link Control. | PPP stands for Point-to-Point Protocol. |
| 3. | Protocol type | HDLC is a bit-oriented protocol. | PPP is a byte-oriented protocol. |
| 4. | Configuration type | HDLC is implemented by Point-to-point link configuration and also multi-point link configurations. | PPP is implemented by Point-to-Point configuration only. |
| 5. | Layer | HDLC works at layer 2 (Data Link Layer). | PPP works at layer 2 and layer 3 (Network Layer). |
| 6. | Dynamic Addressing | Dynamic addressing is not offered by HDLC. | While in this Dynamic addressing is offered. |
| 7. | Media Type | HDLC is used in synchronous media. | PPP is used in synchronous media as well as asynchronous media. |
| 8. | Error detection | HDLC does not offer error detection. | PPP provides the feature of error detection using FCS (Frame Check Sequence) while transmitting data. |
| 9. | Compatibility | HDLC is not compatible with non-Cisco devices. | PPP is compatible with non-Cisco devices. |
| 10. | Format | HDLC protocols have two types- ISO HDLC and CISCO HDLC. | PPP uses a defined format of HDLC. |
| 11. | Authentication | HDLC does not provide link authentication. | PPP provides link authentication using protocols like PAP (Password Authentication Protocol) and CHAP (Challenge Handshake Authentication Protocol). |
| 12. | Cost | HDLC is more costly comparatively. | PPP is comparatively less costly. |
| 13. | Link Quality | HDLC does not offer the quality checking of established links. | PPP offers the quality checking of the established links using LCP (Link Control Protocol). |
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