Osi l ayers

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Information about Osi l ayers

Published on January 16, 2014

Author: jyoti_lakhani

Source: slideshare.net

Functions of OSI Layers Physical Layer Responsible for moving bits from one node to other  Define characteristics of the Medium  Representation of Bits H1 110011000111 H1 110011000111  Data Rate  Synchronization  Link Configuration (Point to Point / Multipoint)  Physical Topology(Mesh / Star/ Bus/ Ring)  Transmission Mode (Simplex/ Half Duplex/ Duplex) Transmission Media

Data Link Layer Responsible for moving FRAMES from one node to next  Framing : Divides data bits received from network layer into frames  Physical Addressing : Add HEADERS to frames. Header show senders/ receivers address  Flow Control : If Senders Data Flow Rate is higher than the receiver  Error Control : By adding Trailers to Frames -Detect Damaged Frames - Retransmit Lost Frames -Recognize Duplicate Frames

 Access Control : It will decideif more than one devices share the same link than which device control the link at that time From Network Layer H2 110011000111 To Physical Layer To Network Layer T2 Frame H2 110011000111 From Physical Layer T2 Frame

Network Layer Responsible for Source to Destination delivery of data PACKETS over multiple networks If Source and Destination are on the same network, there is no need of this layer  Logical Addressing  Routing Using Connecting Devices (Switches/ Routers) From Transport Layer H3 110011000111 To Data Link Layer To Transport Layer Packet H3 110011000111 From Data Link Layer Packet

Transport Layer Responsible for delivery of message from one process to another  Service Point Addressing : Sends entire message to the correct process on computer (port Addressing)  Segmentation and Reassembly : The message is divided into segments. Each segment with a segment no. These segments are arranged in sequence using this segment number at receiver  Connection Control : A connection is established before sending a message and After transmission, connection will be terminated  Flow Control :  Error Control : Make sure that the entire message sends at the receiver - Error control by RETRANSMISSION

From Session Layer H4 110011000111 To Session Layer Packet To Network Layer H4 110011000111 From Network Layer Network Layer (Host – to – Host Delivery) (Process to Process Delivery) Packet

Session Layer Responsible for establish , maintain and synchronize the interaction between the communicating devices  Dialog Control In Simplex/ Half Duplex/ Duplex mode  Synchronization Add Check Points / Synchronization Points to Stream of Data From Presentation Layer H5 To Presentation Layer H5 SP SP SP To Transport Layer SP SP SP SP From Transport Layer SP

Presentation Layer Concerned with syntax and semantics of information exchanged -Translation -Compression -Encryption From Application Layer H6 110011000111 To Session Layer To Application Layer H6 110011000111 From Session Layer

Application Layer Enable User to access network User Human/ Program H7 Data To Presentation Layer User Human/ Program Message H7 Data Message from Presentation Layer

Summary Application Presentation Session Allow Access to network resources Translate or Encrypt Compressed data Establish, Maintain, Terminate Session Transport Process to Process Message delivery Network Inter-Networking (packet Transfer) Data Link Hop- to – Hop delivery ( Frame Transfer) Physical Bits Transfer

H7 What, When, How, where transfer data A H6 Info about translation/ Encryption/ Compression P H5 Synchronization Points H4 H3 S Info About Port Address T Logical Address Packet Switching H2 Physical Address / Frame Sequencing H1 All Above N Message Encrypted Message Encrypted Message Encrypted Message Packets DL Frames Ph Bits

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