"Data Link protocol for 'datalink name' ('device')?" Specify either HDLC, DDCMP, or NONE for the point-to-point data link protocol. The default is DDCMP. o DDCMP (Digital Data Communications Message Protocol) provides synchronous point-to-point connections and asynchronous static or dynamic point-to-point connections. o HDLC (High-Level Data Link Control protocol) conforms to the ISO standards. HDLC provides synchronous point-to-point links that function like DDCMP synchronous links. o Enter NONE if either of the following statements is true. - You do not want to run DECnet over this device - You are using X.25 over this device