Similarly, always responding NACK stresses the
data link layer retry mechanism.
The next task is to size non-priority data flow and to budget for incidentals such as
Data Link Layer retries.
The network file system has a
data link layer which also ensures data consistency in the event of modem link interference or malfunctions.
A virtual local area network (VLAN) is a limited broadcast domain that dwells in the OSI
data link layer (Layer 2).
SAE J1939 CAN systems Recommended Practice for a Serial Control and Communication Vehicle Network, consists of seven documents that define J1939 structure: J1939/71 -- Physical Layer; J1939/13 -- Off-Board Diagnostic; J1939-21 --
Data Link Layer; J1939-31 -- Network Layer; J1939/71 -- Vehicle Application Layer; J1939/73 -- Application Layer; and J1929-81 -- Network Management.
Level 6 Presentation Layer format selection, translation, syntax, date encoding & compression Layer 5 Session Layer open, maintain, closes an information exchange Layer 4 Transport Layer packet delivery, packaging & unpackaging messages Layer 3 Network Layer addresses, traffic & routing determination Layer 2
Data Link Layer transfer of error free data between computers through the physical layer Layer 1 Physical Layer transmission of raw data over physical medium (cable)
It can now be reasoned that AAL and ATM layers constitute ISO
data link layer. AAL layer is regarded as a part of the
data link layer because of the segmentation and reassembly (SAR) function (including the error-checking after the reassembly).
A Trillion types of Protocol comes from all the possible combinations of Protocols that can be identified from Layer 2 (
Data Link Layer) to Layer 7 (Application Layer).