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Posted By :Shashi Ray     Posted Date :April 29, 2010    Points :10   Category :Networking 
High Level Data Link Control (HDLC) and Synchronous Data Link Control (SDLC) are bit-oriented synchronous protocols in which data frames are interpreted as series of bits.

Both are useful for half-duplex and full-duplex communication.

Windows XP still support DLC.

You can also find related Interview Question to HDLC/SDLC?  below: 

HDLC Nodes and Configurations?

Types of HDLC nodes are:
1. Primary Station
2. Secondary Station
3. Combined Station

Supported link configurations:
1. Unbalanced
2. Balanced (More...)

HDLC Data Transfer Modes?

Normal Response Mode (NRM) - Secondary station requires permission from primary station before sending data.

Asynchronous Response Mode (ARM) - Secondary station can transfer without permission from primary station.

Asynchronous Balanced Mode (ABM) - Either of the combined station can initiate the transmission. (More...)

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