INTRODUCTION TO COMPUTER NETWORK

PHYSICAL LAYER

DATA LINK LAYER

NETWORK LAYER

TRANSPORT LAYER

MCQ- COMPUTER NETWORK

APPLICATION LAYER

NETWORK SECURITY

MULTIMEDIA AND FUTURE NETWORKING

COMPUTER NETWORK LAB WORK

Overview of LLC and MAC

COMPUTER NETWORK AND SECURITY NOTES, IOE, TU , BCA, BSCCSIT

OVERVIEW OF LLC AND MAC 

The Data Link Layer is often divided into two sublayers: the Logical Link Control (LLC) sublayer and the Media Access Control (MAC) sublayer. These sublayers work together to provide services and functionalities necessary for reliable communication over a physical link.

  • Logical Link Control (LLC) Sublayer:
    • Provides services to the Network Layer (Layer 3) above it.
    • Offers a reliable link between two network devices.
    • Responsible for error control, flow control, and framing at the logical level.

Protocols: Examples of protocols operating at the LLC sublayer include:

  • IEEE 802.2 (used in IEEE 802 networks like Ethernet)
  • HDLC (High-Level Data Link Control)
  • PPP (Point-to-Point Protocol)
  • Media Access Control (MAC) Sublayer:
    • Handles access to the physical medium (e.g., cable or wireless channel).
    • Provides unique addressing (MAC addresses) for devices on the same network.
    • Controls how devices gain access to the shared communication medium.

Protocols: Examples of protocols operating at the MAC sublayer include:

  • Ethernet (IEEE 802.3)
  • Token Ring (IEEE 802.5)
  • Wi-Fi (IEEE 802.11)