Hello Guys,
I need some help with this questions ...
Usually, we refer to PPP as (Layer 2 Wan Protocol) ... But by giving a closer look, we can see that it uses NCP -Network Control Protocol- to negotiate Layer 3 addressing.
I thought lower layer protocols can't negotiate higher level protocols and addressing ?
Shouldn't Layer 2 protocols -such as HDLC and PPP- focus only on encapsulating Layer 3 packets and forward them without changing or negotiation their Layer 3 addresses ?
Or shall we call PPP a Multi-layer Protocol rather than just L2 protocol ?
Regards,