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Desert View PPP Benefits
Point-to-point Protocol (PPP) has several benefits over other layer 2 encapsulation methods:

• Network protocol multiplexing – Unlike SLIP, which only supports IP, PPP also pass IPX and AppleTalk traffic.
• Data-link setup, configuration, and testing – PPP uses Link Control Protocol (LCP) to establish, configure, and test the data-link connection before passing layer 3 traffic.
• Dynamic IP addressing – PPP allows DHCP requests and responses to pass.
• Error detection – PPP is capable of detecting errors at layer 2.
• Layer 3 negotiations capabilities – PPP allows end stations to negotiate network-layer adddresses and data compression.
• Standardization – In contrast to HDLC, which is implemented differently between different vendors, PPP encapsulation is standardized.
• Security – PPP is more secure than either HDLC or SLIP because it is capable of using PAP or CHAP to authenticate the host attempting to pass traffic to the router.

These features, especially its security capabilities, make PPP attractive to use on the ISDN link between the Sunnyslope Central Office and the Community School. The ISDN link represents a point of weakness in the security of the district network because it is more open to outside attack than the dedicated T1 links between the core routers. Therefore the authentication abilities provided by PPP make it the best option for that link.