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Issues in Data Link Layer

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selvakumar_b1985

Computer Networks - Issues in Datalink Layer (Access Control, Error Control, Framing, Link Control...)

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Issues in Data Link Layer
Issues in Data Link Layer • The main job of the data link layer is to make the communication on the physical link reliable & efficient. Issues, – Provide interface to the network layer services. – Framing – Flow Control – Error Control – Synchronization – Link Configuration Control.
Issues in Data Link Layer Services provided to Network layer  Virtual Communication  Actual Comunication
Types of services provided to the Network Layer,  Unacknowledged Connectionless service  Acknowledged Connectionless service  Acknowledged Connection oriented service Framing • Translation of physical layer’s raw bits into a larger aggregate (or) discrete units called frames. • Here beginning and end of the data are marked to recognize the frame & used in synchronization. Issues in Data Link Layer
Synchronization • Receiver must know, when the data begins & when it ends and also receiver should be able to distinguish between each bit in the frame of data. Flow Control • Refers to the mechanisms that make sure that the sending station cannot overwhelm the receiving station. • Preventing the buffer overflow.  Eg., Sliding Window. Issues in Data Link Layer
Error Control • All transmission media have potential for introduction of errors. • Error control mechanisms can detect as well as correct errors. Link Configuration Control • Link Topology  Physical arrangement of the connection between the devices. • Link Duplexity  Simplex – only one device can transmit to other. (ie., one direction transmit) Issues in Data Link Layer
 half duplex – Both device can transmit to each other, but not simultaneously.  full duplex – Both device can transmit simultaneously. Issues in Data Link Layer

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Issues in Data Link Layer

  • 2. Issues in Data Link Layer • The main job of the data link layer is to make the communication on the physical link reliable & efficient. Issues, – Provide interface to the network layer services. – Framing – Flow Control – Error Control – Synchronization – Link Configuration Control.
  • 3. Issues in Data Link Layer Services provided to Network layer  Virtual Communication  Actual Comunication
  • 4. Types of services provided to the Network Layer,  Unacknowledged Connectionless service  Acknowledged Connectionless service  Acknowledged Connection oriented service Framing • Translation of physical layer’s raw bits into a larger aggregate (or) discrete units called frames. • Here beginning and end of the data are marked to recognize the frame & used in synchronization. Issues in Data Link Layer
  • 5. Synchronization • Receiver must know, when the data begins & when it ends and also receiver should be able to distinguish between each bit in the frame of data. Flow Control • Refers to the mechanisms that make sure that the sending station cannot overwhelm the receiving station. • Preventing the buffer overflow.  Eg., Sliding Window. Issues in Data Link Layer
  • 6. Error Control • All transmission media have potential for introduction of errors. • Error control mechanisms can detect as well as correct errors. Link Configuration Control • Link Topology  Physical arrangement of the connection between the devices. • Link Duplexity  Simplex – only one device can transmit to other. (ie., one direction transmit) Issues in Data Link Layer
  • 7.  half duplex – Both device can transmit to each other, but not simultaneously.  full duplex – Both device can transmit simultaneously. Issues in Data Link Layer