OSI Layer Model Overview :- OSI
Layers or Model means is open system interconnect and OSI model tell that how
to data travel in digital world (network). OSI developed by the International
Organization for Standardization (ISO) in 1974.
4)
Transport Layer - It is Heart of OSI.
5)
Network Layer, 6) Data link Layer, 7) Physical Layer - These Layers known as
Lower Layer or Hardware Layer.
1)
Application Layer:-
Application Layer is responsible for providing Networking services to the user
it means this layer is closest to the end user. It is also know as desktop
layer. Identification of services is done using port number. Data Flow From
Application Layer Data will be Data.
Total
Number of Ports are 0 to 65535.
Reserved
Ports 0 to 1023.
Open
client Ports 1024 to 65535.
2)
Presentation Layer:- Presentation
Layer is responsible for converting data into standard format. Data Flow From
Presentation Layer Data will be Data.
Example
ASII, JPEG, MP3 etc.
Following
Tasks are Preform at Presentation Layer:
# Encryption – Decryption
# Encoding – Decoding
# Compression – Decompression
# Encryption – Decryption
# Encoding – Decoding
# Compression – Decompression
3)
Session Layer:- Session
Layer is responsible for establishing maintaining and terminating session. Data
Flow From Session Layer Data will be Data.
4)
Transport Layer:-
Transport Layer is responsible for end to end connectivity. It is also know as
the heart of OSI Layers. Data Flow From Transport Layer Data will be Segment.
Following
Tasks are Performed by the Transport Layer:
# Identifying Service
# Multiplexing & De-multiplexing
# Segmentation
# Sequencing & Reassembling
# Error Correction
# Flow Control
# Identifying Service
# Multiplexing & De-multiplexing
# Segmentation
# Sequencing & Reassembling
# Error Correction
# Flow Control
5)
Network Layer:- Network
Layer is responsible for providing best path for data to reach the destination.
Logical Addressing works on this layer and Router is a Network layer device.
Data Flow From Network Layer Segment will be Packet.
It
is divided into two parts:
# Routed Protocols
# Routing Protocols
# Routed Protocols
# Routing Protocols
6)
Data Link Layer:-
Data Link Layer is divided into two sub layers. Data Flow From Data Link Layer Packet
will be Frame.
# LLC-(Logical Link Control) it talk about WAN protocols e.g PPP, HDLC, Frame-Relay.
# MAC-(Media Access Control) it talks about physical Address. It is a 48 bit address i.e. 12 digit Hexadecimal Number.
# LLC-(Logical Link Control) it talk about WAN protocols e.g PPP, HDLC, Frame-Relay.
# MAC-(Media Access Control) it talks about physical Address. It is a 48 bit address i.e. 12 digit Hexadecimal Number.
It
is also responsible for Error detection.
Devices
Working on Data Link Layer are Switch, Bridge, NIC
7)
Physical Layer:-
Physical Layer is responsible for electrical, mechanical and procedural checks.
Data will be converted into Binary i.e 0 & 1. Data will be in the form of
electrical pulses if it is Coaxial or twisted pair cable and in the form of
light if it is fiber optic cable. Data Flow From Physical Layer Frame will be
Bits.
Devices working at Physical Layer are Hubs, Repeater, Modems etc.
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Devices working at Physical Layer are Hubs, Repeater, Modems etc.
How you liked this article please tell us your thoughts on comment box.
thank u sir to sharing this post ....
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