Here is a question that will tax your synapes to bursting point! How is PPP and TCP/IP libs "wired" together? Like, DO I (OSI 8) call TCP and it calls IP and down the chain till it spills over and gets real physical (OSI 1)? I am confused. At 10:02 AM 3/5/02 -0500, you wrote: >whoa, it's in the TCP/IP suite, it's not. So let me get this straight. TCP >and UDP are part of IP. TCP provides error sum UDP doesn't and is therefore >faster than TCP. They are encapsulated in IP, which is put into the data >bitstream of a PPP frame. Layer 1 is the physical layer, are bitstreams sent >at that level. BTW I have 56K dial-up no ISDN or DSL. >----- Original Message ----- >