Data connectivity

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Data connection

Terminal - Input & output device connected in a network are called as terminal.

Packet- Data transmission from one pc to another in form  of  small  parts called as packet.

open interface information- It is  define by 
I.S.O. which tell about flow of information.
from one system to another. the whole module is divided in to 7 layer.these all layer
tell about the flow of data from one system to another system.

Physical layer - It convert binary bits in to electrical or optical .before transmit data & agains convert electrical bits . Device work on this layer are hub & repeater.

Data link layer- It receiving to data from network layer &  convert them in frames.
device work's on this layer switch & bridge.
(frames contain four block  first is mac address  second is destination third contain data & fourth contain error control code).
(device work on this layer switch & bridge).

Mac address- It is 48 bit physical address of
machine ( NIC card) . It can not be change by user.

Network layer- It receive  data from transport layer & convert them in to packet
 the device work's on this layer router & brouter.

Routing - It defines the path through which
request & response flow.

Routing-  It  is two type(1)static &(2)dynamic

Static - In this type of routing path preprogramming by user.

Dynamic- In this type of routing router select the easepath  itself.

Transport layer- It create segement of data 
received from session layer.

Session layer - It create session for the data transmission .

Presentation layer- It receive data from application  layer.

Application layer- It convert data in to binary bits this layer consult with application & services.

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