Explain HDLC.

1.	Explain HDLC.
Answer» HDLC (High-Level Data LINK Control) is a group of communication protocols that USUALLY provides reliable DELIVERY of data frames over communication or network link. It is a PROPRIETARY protocol for CISCO and is the default encapsulation operated within CISCO routers. It ALSO ensures the error-free transmission of data and can provide both connection-oriented and connectionless services.

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