Synchronous Data Link Control(SDLC)

Synchronous Data Link Control(SDLC) 

Synchronous Data Link Control(SDLC) 

SDLC is same as HDLC . The only difference is in the format. In this case the size of the information field is variable whereas in case of HDLC it is multiple of byte. SLIP(Serial Line Internet Protocol) Short for, a protocol for connection to the Internet via a dial-up connection. Developed in the 80s when modem communications typically were limited to 2400 bps, it was designed for simple communication over
serial lines. SLIP can be used on RS-232 serial ports and supports asynchronous links. PPP(Point-to-Point Protocol) A more common protocol is PPP (Point-to-Point Protocol) because it is faster and more reliable and supports functions that SLIP does not, such as error detection, dynamic assignment of IP addresses and data compression. Point-to-Point Protocol, a method of connecting a computer to the Internet. PPP is more stable than the older SLIP protocol and provides error checking features. Working in the data link layer of the OSI model, PPP sends the computer's TCP/IP packets to a server that puts them onto the Internet.
In general, Internet service providers offer only one protocol although some support both protocols.