The data link layer packs bits which have been moved by the Physical Layer, into frames, so that each frame is distinguishable from another whiles being transmitted to destination.
A point-to-point connection between two computers or devices consists of a wire in which data is transmitted as a stream of bits. However, these bits must be framed into discernible blocks of information. Framing is a function of the data link layer which provides a way for a sender to transmit a set of bits that are meaningful to the receiver. Ethernet, token ring, frame relay, and other data link layer technologies have their own frame structures. Frames have headers that contain information such as error-checking codes.
There are three different types of framing, each of which provides a way for the sender to tell the receiver where the block of data begins and ends:
The advantage of using frames is that data is broken up into recoverable chunks that can easily be checked for corruption. If a problem occurs during the transmission and some frames get corrupted, only the lost frames will be retransmitted, and not the entire set of data.
The usual approach and prime purpose of the Data Link Layer is to break the bit stream up into discrete frames for the purpose of Error Detection or Correction
By Louis Khim Burns
Frames Are The Small data Units Created By Data Link Layer And The Process Of Creating Frames By The Data Link Layer Is Known As Framing.
Framing is done at the Data Link layer (Layer 2). Routing is done at the Network layer (Layer 3).
The role is to transfer frames to packets
Frames are encapsulating packets. The data link layer makes framing and provide this service to the layer above layer "the network layer".
Frames are encapsulating packets. The data link layer makes framing and provide this service to the layer above layer "the network layer".
Frames are encapsulating packets. The data link layer makes framing and provide this service to the layer above layer "the network layer".
The data link layer is still needed for flow control over the transmission channel and for framing the data. In a multiple access medium such as a LAN, the data link layer is required to coordinate access to the shared medium among the multiple users.
Layer 2 (Data Link Layer) http://compnetworking.about.com/cs/internetworking/g/bldef_bridge.htm
Data link layer
The data link layer (layer 2) and the physical layer (layer 1) use the constructed frame.
The layer 2 devices use the data link layer addresses.
Data Link Layer
Data link layer