cisco ccna ebook

cisco ccna ebook.Cisco HDLC is a proprietary protocol, while PPP is an open standard based on RFC 1332, 1661, and 2153 definitions. Like HDLC, PPP is a Layer 2 protocol for synchronous serial connections as well as high-speed serial interfaces (HSSI) and ISDN interfaces (BRI and PRI). The next few subsections provide an overview of PPP and describe how to configure it (including authentication).Cisco HDLC is a proprietary protocol that can only be used for point-to-point connections between two Cisco devices. PPP should be used when connecting a Cisco router to a non-Cisco router using a point-to-point connection, because it is based on open standards. HDLC, PPP, and Frame Relay are all Layer 2 protocols.24.3.1 PPP ComponentsPPP has many features that HDLC does not. Like HDLC, PPP defines frame types and how two PPP devices communicate with each other, including multiplexing network layer and data link layer protocols over the link. However. the following features are provided by PPP.. Dynamically configure the link. . Supports authentication. . Compressing packet headers. . Checking Link Quality.Chapter 24 Introduction to WAN 649 .. Performing Error Detection and Correction.. Supports bundling multiple PPP physical connections into a single logical connection (known as a multilink), thereby balancing the load across multiple links.PPP supports a variety of encapsulated protocols. authentication. compression. multi-link and error detection/correction for asynchronous PPP contains three main components.. Frame format (encapsulation) o