jaringan komputer dasar data link layer (1) aurelio rahmadian
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Jaringan Komputer DasarData Link Layer (1)
Aurelio Rahmadian
ObjektifData Link LayerTeknik Media Access Control
Data Link Layer
Data Link LayerThe Data Link layer provides a means for
exchanging data over a common local media.The Data Link layer performs two basic services:
o Allows the upper layers to access the media using techniques such as framing o Controls how data is placed onto the media and is received from the media
using techniques such as media access control and error detection
As with each of the OSI layers, there are terms specific to this layer: o Frame - The Data Link layer PDUo Node - The Layer 2 notation for network devices connected to a common
mediumo Media/medium (physical) - The physical means for the transfer of information
between two nodeso Network (physical) - Two or more nodes connected to a common medium
Data Link Layer
Data Link Layer
Data Link LayerData Link layer protocols require
control information to enable the protocols to function. Control information may tell:◦Which nodes are in communication with
each other◦When communication between individual
nodes begins and when it ends◦Which errors occurred while the nodes
communicated◦Which nodes will communicate next
Data Link Layer
Data Link Layer
Data Link Layer
Data Link Layer
Teknik Media Access ControlMedia access control is the equivalent of
traffic rules that regulate the entrance of motor vehicles onto a roadway. The absence of any media access control would be the equivalent of vehicles ignoring all other traffic and entering the road without regard to the other vehicles.
The method of media access control used depends on:◦ Media sharing - If and how the nodes share the
media◦ Topology - How the connection between the
nodes appears to the Data Link layer
Teknik Media Access Control
Teknik Media Access Control
Teknik Media Access Control
Teknik Media Access ControlMedia access control protocols
for non-shared media require little or no control before placing frames onto the media. These protocols have simpler rules and procedures for media access control. Such is the case for point-to-point topologies.
Teknik Media Access Control