Published on January 16, 2014
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
OSI model layers; Internet protocol suite layers; ... Map layer: a set of graphical information, especially in geographic information systems; Electronics
1. Functions of OSI Layers Physical Layer Responsible for moving bits from one node to other Define characteristics of the Medium ...
The OSI Reference Model is really just a guideline. Actual protocol stacks often combine one or more of the OSI layers into a single layer.
The simplification provided by a good abstraction layer ... The ISO-OSI networking model comprises seven abstraction layers. Each layer of the OSI ISO ...
Networking Fundamentals » Volume 7, o SI lower l ayers Page 3 does not address physical entities and so has no physical layer. In the TCP/ IP model, the ...
Notes on the 5-Layer and 7-Layer Models of ... The OSI movement was an important thrust in the world of computers and computing ...
MAKALAH OSI LAYER. Disusun Oleh : Moh Aziz Nugroho (A11.2011.05980) UNIVERSITAS DIAN NUSWANTORO SEMARANG ... upper l ayers dan lower l ayers,
Osi 7 Layers Pdf downloads at Ebooks-kings.com - Download free pdf files,ebooks and documents - The OSI Model: Understanding the Seven Layers of
© SANS Institute 2001, ... and physical l ayers comprise the lower layers, ... The application layer is the top laye r of the OSI model.