data link layer


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Related to data link layer: Transport layer

data link layer

(networking)
Layer two, the second lowest layer in the OSI seven layer model. The data link layer splits data into frames (see fragmentation) for sending on the physical layer and receives acknowledgement frames. It performs error checking and re-transmits frames not received correctly. It provides an error-free virtual channel to the network layer. The data link layer is split into an upper sublayer, Logical Link Control (LLC), and a lower sublayer, Media Access Control (MAC).

Example protocols at this layer are ABP, Go Back N, SRP.
This article is provided by FOLDOC - Free Online Dictionary of Computing (foldoc.org)

data link layer

The processing in a network protocol that manages transmission from node to node. The data link layer is layer 2 of 7 in the OSI model. The upper layers provide network-to-network transmission and guarantee of delivery. See data link protocol, TCP/IP, OSI model and MAC layer.
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References in periodicals archive ?
Challenges to the Wireless 100 Gbps Data Link Layer Implementation
Symmetric encryption can be applied at different layers of the communication stack such as the data link layer (e.g., wireless transmissions) and to specific objects of data within a message such as sensor readings.
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.
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).

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