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HDLC and SDLC WAN protocols operate at which OSI layer?
Transport
Network
Physical
Data-link
These operate at the data link layer --- variation of the ISO HDLC protocol called HDLC Normal Response Mode (NRM) is essentially the same as SDLC. SDLC is not a peer to peer protocol like HDLC, Frame Relay or X.25. An SDLC network is made up of a primary station that controls all communications, and one or more secondary stations. http://www.sangoma.com/tutorials/sdlc/
HDLC = High-level Data Link Control SDLC = Synchronous Data Link Control
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