Data Link Control

Understanding data link control protocols and techniques

Introduction to Data Link Control

Data Link Control is a crucial layer in data communication that manages the reliable transfer of data between two directly connected nodes. It ensures error-free data transmission and proper flow control between sender and receiver.

Key Functions

Framing

Dividing data into manageable units:

  • Character-oriented framing
  • Bit-oriented framing
  • Fixed-size frames
  • Variable-size frames

Flow Control

Managing data transmission rate:

  • Stop-and-Wait
  • Sliding Window
  • Buffer management
  • Rate control

Error Control

Ensuring data integrity:

  • Error detection
  • Error correction
  • ARQ protocols
  • Retransmission

Common Protocols

HDLC (High-Level Data Link Control)

Bit-oriented protocol:

  • Point-to-point links
  • Multipoint links
  • Full-duplex operation
  • Error detection

PPP (Point-to-Point Protocol)

Internet standard protocol:

  • Authentication
  • Compression
  • Error detection
  • Multiple protocols

Comparison of Protocols

Protocol Type Features Applications
HDLC Bit-oriented Full-duplex, Error control WAN, Leased lines
PPP Byte-oriented Authentication, Compression Internet, Dial-up

Data Link Control का परिचय

Data Link Control Data Communication का एक महत्वपूर्ण layer है जो दो सीधे जुड़े nodes के बीच reliable data transfer को manage करता है। यह sender और receiver के बीच error-free data transmission और proper flow control सुनिश्चित करता है।

मुख्य Functions

Framing

Data को manageable units में divide करना:

  • Character-oriented Framing
  • Bit-oriented Framing
  • Fixed-size Frames
  • Variable-size Frames

Flow Control

Data transmission rate को manage करना:

  • Stop-and-Wait
  • Sliding Window
  • Buffer Management
  • Rate Control

Error Control

Data integrity सुनिश्चित करना:

  • Error Detection
  • Error Correction
  • ARQ Protocols
  • Retransmission

Common Protocols

HDLC (High-Level Data Link Control)

Bit-oriented Protocol:

  • Point-to-point Links
  • Multipoint Links
  • Full-duplex Operation
  • Error Detection

PPP (Point-to-Point Protocol)

Internet Standard Protocol:

  • Authentication
  • Compression
  • Error Detection
  • Multiple Protocols

Protocols की तुलना

Protocol Type Features Applications
HDLC Bit-oriented Full-duplex, Error Control WAN, Leased Lines
PPP Byte-oriented Authentication, Compression Internet, Dial-up