What are the layers in OSI Reference Models? Describe each layer briefly?

Trainee Asked on November 2, 2019 in Networking.
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Given below are the seven layers of OSI Reference Models:

(1) Physical Layer (Layer 1): Physical Layer converts data bits into electrical impulse or radio signals. Example: Ethernet.

(2) Data Link Layer (Layer 2): At the Data Link layer, data packets are encoded and decoded into bits and it provides a node to node data transfer. Data Link Layer also detects the errors that occurred at Layer 1.

(3) Network Layer (Layer 3): Network Layer transfers variable length data sequence from one node to another node in the same network. This variable-length data sequence is also known as “Datagrams”.

(4) Transport Layer (Layer 4): It transfers data between nodes and also provides acknowledgment of successful data transmission. It keeps track of transmission and sends the segments again if the transmission fails.

RE: What are the layers in OSI Reference Models? Describe each layer briefly?

(5) Session Layer (Layer 5): Session Layer manages and controls the connections between computers. It establishes, coordinates, exchange and terminates the connections between local and remote applications.

(6) Presentation Layer (Layer 6): It is also called as “Syntax Layer”. Layer 6 transforms the data into the form in which the application layer accepts.

(7) Application Layer (Layer 7): This is the last layer of OSI Reference Model and is the one which is close to the end user. Both end-user and application layer interacts with the software application. This layer provides services for email, file transfer etc.

Reviewer Answered on November 2, 2019.
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