Computer
Network Models
Computer network model is
classified into two .These are OSI Model(Open System Interconnect model) and
Internet Model. We see each individuals in detials.
OSI Model
Open System Interconnect is
an open standard for all communication systems. OSI model is established by
International Standard Organization (ISO). This model has seven layers:
Application Layer:
This layer is responsible for providing interface to the application
user.
Presentation Layer:
This layer defines how data in the native format of remote host should be
presented in the native format of host.
Session Layer: This layer
maintains sessions between remote hosts. For example, once user/password
authentication is done, the remote host maintains this session for a while and
does not ask for authentication again in that time span.
Transport Layer: This layer
is responsible for end-to-end delivery between hosts.
Network Layer: This
layer is responsible for address assignment and uniquely addressing hosts in a
network.
Data Link Layer: This layer
is responsible for reading and writing data from and onto the line.
Physical Layer: This layer
defines the hardware, cabling wiring, power output, pulse rate etc.
Internet Model
Internet uses TCP/IP protocol
suite, also known as Internet suite. This defines Internet Model which contains
four layered architecture. This model has the following layers:
Application Layer:
This layer defines the protocol which enables user to interact with the
network.
Transport Layer: This
layer defines how data should flow between hosts. Major protocol at this layer
is Transmission Control Protocol (TCP). This layer ensures data delivered
between hosts is in-order and is responsible for end-to-end delivery.
Interne layer: Internet Protocol (IP) works on this layer. This layer facilitates host addressing and recognition. This layer defines routing.
Data Link Layer: This layer
provides mechanism of sending and receiving actual data.