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10 Cards in this Set

  • Front
  • Back
The data link layer of the OSI model provides access to
the networking media and physical transmission across the media, which enables the data to locate its intended destination on a network.
The data link layer is concerned with physical (as opposed to network, or logical)...
addressing
network topology
line discipline (how end systems will use the network link)
error notification
ordered delivery of frames
flow control.
Layer 1 limmitation:
Layer 1 cannot communicate with the upper level layers

Layer 2 solution:
Layer 2 Logical Link Control (LLC).
Layer 1 limmitation:
Layer 1 cannot name or identify computers

Layer 2 solution:
Layer 2 uses the addressing (or naming) process to identify computers
Layer 1 limmitation:
Layer 1 can only describe streams of bits

Layer 2 solution:
Layer 2 uses framing to organize or group the bits
Layer 1 limmitation:
Layer 1 cannot decide which computer will transmit binary data from a group that are all trying to transmit at the same time
Layer 2 solution:
Media Access Control (MAC) address
IEEE 802.3 specifies...
Layer 1: the physical layer

Layer 2: the channel-access portion of the data link layer
IEEE divides the data link layer two parts:
>The technology-independent 802.2 LLC standard
>The specific, technology-dependent parts that incorporate Layer 1 connectivity
>>Media Access Control (MAC) (transitions down to media)
>>Logical Link Control (LLC) (transitions up to the network layer)
LLC stands for
Logical Link Control (LLC)
MAC stands for:
Media Access Control (MAC)