Forsaken_GA wrote: »
It largely depends on the type of serial link as to what the layer 2 protocol is. For example, a frame relay link will be using frame relay (the standard for frame relay covers both, the layer 1 and layer 2 specification). If you're connecting two routers back to back with serial links, you might be using HDLC. If you're using a dialup connection, it could be PPP or SLIP.
Serial links are alot more open, they're not bound to a specific layer 2 type because of their layer 1 type like most modern protocols.
tengu wrote: »
What Forsaken_GA said plus I cannot find any IEEE standards on hdlc, ppp, or frame relay. Bunch of RFC's though.
johnifanx98 wrote: »
HDLC is a standard of ITU-T, now ISO seems like. Unfortunately ISO's publication is not free online...
Actually my interest with HDLC is how ARP or similar protocols are implemented on router's HDLC interface. Googled without luck....