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This Page Contains information about OSI Data Link Layer 2 Devices Explained By Webune in category Networking with 0 Replies. [3395], Last Updated: Mon Jun 24, 2024
Webune
Sun Jun 08, 2008
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THIS POST NEEDS TO BE EDITED, THE EDITOR MAY NOT BE THE ORIGINAL AUTHOR.
data link
The data link layer specifies how devices attached to the network gain access tot he various computing resources. this later packages data into frames that are to be sent out on the network. some error checking and retransmission responsibilities are built into the layer. it is responsible for providing error-free transfer of frames from one computer to another through the physical layer
think of the network as a highway. the data link layer is the entry ramp or toll booth by which you can gain access onto the highway. similar tot he traffic lights found at onromas for control of merging traffic, access methods are contained in the data link protocol definition to tell each node when it is its turn to transmit data.
the IEEE working in conjunction with ISO established the IEEE 802 specification series that divides this layer into two sub-layers
Logical Link Control (LLC) the LLC sub-layer provides software controls to manage mutiple protocols that are simultaneously accessing the network. the IEEE 802.2 acts like an umbrella protocol for the vairous MAC sublayer protocols.
Media Access Control (MAC) the MAC layer physically defines how devices control access to the network. this layer defines the network adapter inerface options, supported cable types and the designeated access methos. ther are number ot specifications defined, including 802.3 (CSMA/CD or Ethernet) 802.4 (Token Bus) and 802.5 (Token Ring)
Data Link | Logical Link Control LLC Layer | 802.2 (LLC sublayer) |
Media Access Control MAC Layer | 802.3 (Ethernet) 802.4 (Token Bus) 802.5 (Token Ring) |
Physical Layer | Physical Layer |
Devices Used in Layer 2:
Switch
Bridge
Nic Card
ISDN Card
examples:
ethernet
token ring
FDDI
SDLC