The Open Systems Interconnection (OSI) reference model has served as the most basic elements of computer networking since the inception in 1984. The OSI Reference Model is based on a proposal developed by the International Standards Organization (ISO).

2.  Muhammad Adeel

3.  The Open Systems Interconnection (OSI)
reference model has served as the most basic elements
of computer networking since the inception in 1984.
The OSI Reference Model is based on a proposal
developed by the International Standards
Organization (ISO).
 This model allows any two different systems to
communicate regardless of their underlying
architecture.

4.  7th- Layer: Application Layer
 6th– layer : Presentation Layer
 5th– layer : Session Layer
 4th– layer : Transport Layer
 3th– layer : Network Layer
 2nd– layer : Data-link Layer
 1st– layer : Physical Layer
All People Seems To Need Data Progress

5. Bits
Frames
Packet
Segments
Data

6.  The application layer is the seventh layer of the OSI
model and the only one that directly interacts with the
end user.
The application layer provides many services, including:
 Simple Mail Transfer Protocol (email)
 File transfer (FTP)
 Web surfing
 Web chat
 Network data sharing
 Various file and data operations

8. The presentation layer is responsible for the following:
 Data Format (.txt .jpg .html .ppt .doc)
 Data encryption/decryption Hello=GK001F47
 Data compression (Zip)

10.  The session layer manages a session by initiating the
opening and closing of sessions between end-user
application processes.
 This layer also controls single or multiple connections
for each end-user application, and directly
communicates with both the presentation and the
transport layers.

11.  23.23.15.99 : 5478
 23.23.15.99 : 8547
 23.23.15.99 : 9624 Port
Number

13.  The transport layer is the layer in the open system
interconnection (OSI) model responsible for end-to-
end communication over a network.
 It provides logical communication between
application processes running on different hosts
within a layered architecture of protocols and other
network components.

14.  Segmentation
 Flow Control
 Reliable and Unreliable Data

15.  Connection Oriented Transmission
In this type of transmission the receiving device sends
an acknowledgment back to the source after a packet
or group of packet is received.
 Connectionless Transmission
In this type of transmission the receiver does not
acknowledge receipt of a packet.

16.  It is responsible for source process to destination
process delivery of entire message.

17. It is responsible for the source to destination delivery of a
packets across multiple networks.
Logical addressing:- Adds Logical addresses of sender and
Receiver.

18.  IP Address = 39.250.100.199
 Routing Protocol
OSPF 89
EIGRP 88
 Routed Protocol
IP
AppleTalk
ICMP
 Select Best Path

20. The data link layer is responsible for moving
frames from one node to the next.
 Responsibilities :
Physical Addressing
Flow Control
Error Control
Feedback

21.  Logical Link Control (LLC)
 Media Access Control (MAC)
3A-34-C2-2A-59-86

22. Physical layer is the bottom(layer 1) of OSI model.
It is responsible for the actual physical connection
between the devices.
The physical layer is responsible for movements of
individual bits from one node to next.

23.  Convert bits to signals
 Bit synchronization
 Manage physical connection
 Bit rate control
 Line configuration
 Physical topology
 Transmission mode
 Multiplexing
 Switching