Osi model vs TCP/IP

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.

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

Osi model vs TCP/IP

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