OSI Layer Definitions

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OSI Layer Definitions:


  1. The Physical Layer corresponds to the physical elements of the transmission medium such as signaling specifications, cable types and interfaces. It also characterizes voltage levels, physical data rates, and transmission distances.
  1. The Data-Link Layer works with the transport of data across one particular link or medium. Data at the data link layer is condensed into frames. Data-link specifications correspond to physical addresses, frame sequences, flow control, and physical topology. At this level data is transformed from frames into bits when transmitted across media and changed back into frames when received from the media. Bridges and switches operate at the data-link layer. In the IEEE 802, the data link layer is divided into two sublayers: Logical Link Control (LLC) and Media Access Control (MAC). The upper sublayer – Logical Link Control (LLC) administers the communication between devices. The lower sublayer – Media Access Control (MAC) manages protocol access to the physical media.
  1. The Network Layer corresponds to data routing, labeled packets at this layer, and establishes the methods to facilitate this including the functionality of routing, logical addressing, and how routes are determined. It also defines how packets are broken down into smaller packets to support media with smaller maximum transmission unit (MTU) sizes.
  2. The Transport Layer…

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