SLIP vs. PPP

• SLIP

  • Serial Link IP
  • IP with minimal header
  • No error checking
  • IP ONLY

• PPP

  • Point to Protocol
  • HDLC
  • LCP - Error checking
    • LQM - FCS
  • NCP - Carries Multiple Protocols:
    • IPCP (IP)
    • IPXCP (IPX)
    • ATCP (Appletalk)
    • NBCP (NetBIOS)

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SLIP header - END Decimal 192

ESC - Decimal 219

Replaces data END with ESC-Dec 220

Replaces data ESC with ESC-Dec 335

Sends IP datagram followed by END

HDLC- High Level Data Link Control, ISO - 3309 also used in X.25, Frame Relay, and ISDN.

LCP - Link Control Protocol

FCS - Frame Check Sequence -16-bitCRC

Link Quality Monitoring - Definable test of link failure

NCP - Network Control Protocols

LCP and NCP negotiate Network Layer connection between the two points