![]() PPP provides transport over ATM, Frame Relay, ISDN, and optical links. PPP can be used over twisted pairs, fiber-optic lines, and satellite transmission. This is one of many advantages of using PPP, it is not proprietary. The basic purpose of PPP at this point is to transport layer-3 packets across a Data Link layer point-to-point link. ![]() However, when you need to connect to a non-Cisco router, you should use PPP encapsulation. This means Cisco HDLC can only work with other Cisco devices. Note: The default serial encapsulation method when you connect two Cisco routers is HDLC. Therefore, the protocol that is used for establishing this connectivity between the two of you is the Point-to-Point Protocol or the PPP. The connection between the ISP and you makes up two points on the network. Simply, when you establish a connection to your ISP (Internet Service Provider) through a modem. A LAN-to-WAN point-to-point connection is also referred to as a serial connection or leased-line connection because the lines are leased from a carrier (usually a telephone company) and are dedicated for use by the company leasing the lines. PPP connections are used to connect LANs to service provider WANs, and to connect LAN segments within an organization’s network. ![]() ![]() A point-to-point connection is one of the most common types of WAN connection.
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