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(command or response). The DSAP and SSAP pair with some reserved values indicates
some well-known services listed in the table below.
LLC type 1 connectionless service, LLC type 2 connection-oriented service and LLC type
3 acknowledge connectionless service are three types of LLC frame for all classes of
service. In Fig 3-2, it shows the format of Service Access Point (SAP). Please refer to
IEEE802.2 for more details.
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Because LAN is composed of many nodes, for the data exchanged among these nodes,
each node must have its own unique address to identify who should send the data or should
receive the data. In OSI model, each layer provides its own mean to identify the unique
address in some form, for example, IP address in network layer.
VigorSwitch P1100 User's Guide
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