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TOPIC

OSI MODEL VS. TCP/IP
      MODEL
OSI Model
 Introduction
 The Open Systems Interconnection (OSI)
 model is a reference tool for understanding
 data communications between any two
 networked systems.
 There are also some benefits of OSI Model.
Seven Layers
The Physical Layer

   Physical Layer is responsible for transmitting
    row bit stream over the physical cable.
   Functions:
  o Data encoding
  o Transmission technique
  o Physical medium transmission
Data link Layer

 Data link layer is responsible for controlling
    the error between adjacent nodes and transfer
    the frames to other computer via physical
    layer.
   Functions:
o   Link establishment and termination
o   Frame traffic control
o   Frame acknowledgment
The Network Layer

 This layer is responsible for translating the
    logical network address and names into their
    physical address.
   Functions :
o   Subnet traffic control
o   Logical-physical address mapping
o   Frame fragmentation
The Transport Layer

 This layer is responsible for end-to-end
    delivers of messages between the networked
    hosts
   Functions:
o   Message segmentation
o   Message acknowledgment
o   Session multiplexing
The Session Layer

 This layer is responsible for establishing the
  process-to-process communication between
  the hosts in the network.
 Functions:
o Session establishment, maintenance and
  termination
o Session support
The Presentation Layer

 The Presentation layer is responsible for
    protocol conversion, date
    encryption/decryption, Expanding graphics
    command and the date compression.
   Functions:
o   Character code translation
o   Data conversion
o   Data compression
The Application Layer

 The application layer provider different
    services to the application.
   Functions:
o   Remote file access
o   Electronic messaging
o   Directory services
o   Network management
TCP/IP Model


 TCP/IP are two protocols of this model. TCP
  stands for Transmission Control Protocol and
  IP stands for Internet Protocol.
 There are 4 Layers in TCP/IP Model.
Application Layer

 The Application Layer in TCP/IP groups the
  functions of OSI Application, Presentation
  Layer and Session Layer.
 Functions:
o Refers to standard network services
o Also defines compatible representation of all
  data
Transport Layer

 In TCP/IP architecture, there are two Transport
  Layer protocols. The Transmission Control
  Protocol (TCP) guarantees information
  transmission
 Functions:
o Manages the transfer of data
o Manages the connections between networked
  applications
Internet Layer

 The Internet Protocol (IP) is the primary
  protocol in the TCP/IP Network Layer.
 Functions:
o Manages addressing of packets and delivery of
  packets between networks
o Fragments packets so that they can be dealt
  with by lower level layer
Network Layer

 In the TCP/IP architecture, the Data Link
  Layer and Physical Layer are normally
  grouped together to become the Network
  Access layer
 Functions:
o Delivers data via physical link
o Provides error detection and packet framing
OSI Model vs.TCP/IP Model


 The OSI model consists of 7 architectural
  layers whereas the TCP/IP only has 4 layers.
 OSI is a reference model and TCP/IP is an
  implementation of OSI model.
 The OSI model however is
  a "generic, protocol-independent standard.
Sr. No.   TCP/IP Reference Model                       OSI Reference Model


1         Defined after the advent of Internet.        Defined before advent of internet.



          Service interface and protocols were not     Service interface and protocols are clearly
2         clearly distinguished before                 distinguished


3         TCP/IP supports Internet working             Internet working not supported


4         Loosely layered                              Strict layering




5         Protocol Dependant standard                  Protocol independent standard


6         More Credible                                Less Credible


          TCP reliably delivers packets, IP does not
7         reliably deliver packets
                                                       All packets are reliably delivered
Thank you

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OSI MODEL VS TCP/IP MODEL: A COMPARISON OF THE TWO NETWORKING STANDARDS

  • 1. TOPIC OSI MODEL VS. TCP/IP MODEL
  • 2. OSI Model  Introduction  The Open Systems Interconnection (OSI) model is a reference tool for understanding data communications between any two networked systems.  There are also some benefits of OSI Model.
  • 4. The Physical Layer  Physical Layer is responsible for transmitting row bit stream over the physical cable.  Functions: o Data encoding o Transmission technique o Physical medium transmission
  • 5.
  • 6. Data link Layer  Data link layer is responsible for controlling the error between adjacent nodes and transfer the frames to other computer via physical layer.  Functions: o Link establishment and termination o Frame traffic control o Frame acknowledgment
  • 7.
  • 8. The Network Layer  This layer is responsible for translating the logical network address and names into their physical address.  Functions : o Subnet traffic control o Logical-physical address mapping o Frame fragmentation
  • 9.
  • 10. The Transport Layer  This layer is responsible for end-to-end delivers of messages between the networked hosts  Functions: o Message segmentation o Message acknowledgment o Session multiplexing
  • 11.
  • 12. The Session Layer  This layer is responsible for establishing the process-to-process communication between the hosts in the network.  Functions: o Session establishment, maintenance and termination o Session support
  • 13.
  • 14. The Presentation Layer  The Presentation layer is responsible for protocol conversion, date encryption/decryption, Expanding graphics command and the date compression.  Functions: o Character code translation o Data conversion o Data compression
  • 15.
  • 16. The Application Layer  The application layer provider different services to the application.  Functions: o Remote file access o Electronic messaging o Directory services o Network management
  • 17.
  • 18. TCP/IP Model  TCP/IP are two protocols of this model. TCP stands for Transmission Control Protocol and IP stands for Internet Protocol.  There are 4 Layers in TCP/IP Model.
  • 19.
  • 20. Application Layer  The Application Layer in TCP/IP groups the functions of OSI Application, Presentation Layer and Session Layer.  Functions: o Refers to standard network services o Also defines compatible representation of all data
  • 21. Transport Layer  In TCP/IP architecture, there are two Transport Layer protocols. The Transmission Control Protocol (TCP) guarantees information transmission  Functions: o Manages the transfer of data o Manages the connections between networked applications
  • 22. Internet Layer  The Internet Protocol (IP) is the primary protocol in the TCP/IP Network Layer.  Functions: o Manages addressing of packets and delivery of packets between networks o Fragments packets so that they can be dealt with by lower level layer
  • 23. Network Layer  In the TCP/IP architecture, the Data Link Layer and Physical Layer are normally grouped together to become the Network Access layer  Functions: o Delivers data via physical link o Provides error detection and packet framing
  • 24. OSI Model vs.TCP/IP Model  The OSI model consists of 7 architectural layers whereas the TCP/IP only has 4 layers.  OSI is a reference model and TCP/IP is an implementation of OSI model.  The OSI model however is a "generic, protocol-independent standard.
  • 25.
  • 26. Sr. No. TCP/IP Reference Model OSI Reference Model 1 Defined after the advent of Internet. Defined before advent of internet. Service interface and protocols were not Service interface and protocols are clearly 2 clearly distinguished before distinguished 3 TCP/IP supports Internet working Internet working not supported 4 Loosely layered Strict layering 5 Protocol Dependant standard Protocol independent standard 6 More Credible Less Credible TCP reliably delivers packets, IP does not 7 reliably deliver packets All packets are reliably delivered