OSI Layer 2 - Data Link Layer. The data link layer or layer 2 is the second layer of the seven-layer OSI model of computer networking. This layer is the protocol layer that transfers data between adjacent network nodes in a wide area network (WAN) or between nodes on the same local area network (LAN) segment.[1]

The data link layer is connected to the media in one of two ways: multipoint connections (as is the case with LANs) and point to point connections (i.e., phone lines to an ISP). The most popular multipoint data link protocol is Ethernet. The data-link layer establishes and maintains the data link for the network layer above it. It ensures that data is transferred reliably between two stations on the network. A number of protocols can be implemented at this layer depending on whether you are establishing local area network or wide area network connections between stations. As Wireshark decodes packets at Data Link layer so we will not get physical layer information always. In some cases, capturing adapter provides some physical layer information and can be displayed through Wireshark. So here are the sequence layers seen in Wireshark These layer’s descriptions and functions are stated below: Network Interface Layer. This consists of the data link layer which is responsible for the detection and correction of possible errors; and the physical layer that activates the physical transmission for bit transmission by procedural, electrical, mechanical, and functional means. Networks: Data Link Layer 6 Data Link Layer Model Assume the sending Host has infinite supply of messages. A node constructs a framefrom a single packet message. The CRC is automatically appended in the hardware. The protocols are developed in increasing complexity to help students understand the data link layer issues.

Data Link Layer Protocols. Based on Media used, Data link Layer encapsulates IP Packets into HDLC, PPP, Frame Relay, or Ethernet frames, and since Data-Link Layer deals straight with the physical layer that might be different technology on each Hop, Data-Link Layer must use different types of protocols (Or be able to speak each cable language) to reframe/repackage IP packets across different

The actual data link layer is split into two sublayers, called the MAC (Medium Access Control) sublayer and the LLC (Logical Link Control) sublayer, as shown in Figure D-11. The lower MAC layer defines the media access method, which can be CSMA/CD (carrier sense multiple access/collision detection), token ring, or other IEEE physical interface. Data Link Layer. In the OSI model, the data link layer is a 4 th layer from the top and 2 nd layer from the bottom.; The communication channel that connects the adjacent nodes is known as links, and in order to move the datagram from source to the destination, the datagram must be moved across an individual link. Definition The Data Link Layer is the second layer in both the OSI and TCP/IP network models. Communications at this layer happen directly between nodes. On Ethernet networks, this is also sometimes called the MAC layer.

Nov 15, 2016 · The data link layer is used for the encoding, decoding and logical organization of data bits. Data packets are framed and addressed by this layer, which has two sublayers. The data link layer's first sublayer is the media access control (MAC) layer. It is used for source and destination addresses.

The Routing Layer works to coordinate related parts of a data conversation to ensure that large files are transferred. In other words, while the data link layer deals with the method in which the physical layer is used to transfer data, the network layer deals with organizing that data for transfer and reassembly. The actual data link layer is split into two sublayers, called the MAC (Medium Access Control) sublayer and the LLC (Logical Link Control) sublayer, as shown in Figure D-11. The lower MAC layer defines the media access method, which can be CSMA/CD (carrier sense multiple access/collision detection), token ring, or other IEEE physical interface.