This presentation presents most important two layer of OSI model which is data link layer and network layer.

1. Welcome to our
Presentation
Presentation Topic: Data Link Layer and Network
Layer

2. Group Members
 Md. Rifat Rahman ID: 162-15-1049
 Hasan Haider ID: 162-15-1041
 Arifur Jaman ID: 153-15-607
 Shahedul Islam Rishad ID: 162-15-1029
 Mohammad Salim Hosen ID: 162-15-1044

3. Data-Link layer
 The data link layer is the protocol layer in a program that
handles the moving of data into and out of a physical link in
a network. The data link layer is Layer 2 in the Open Systems
Interconnection (OSI) architecture model for a set of
telecommunication protocols. Data bits are encoded,
decoded and organized in the data link layer, before they are
transported as frames between two adjacent nodes on the
same LAN or WAN. The data link layer also determines how
devices recover from collisions that may occur when nodes
attempt to send frames at the same time.

4. Data-Link layer
Access to media
Provides reliable transfer of data across media
Transmits frames node to node based on station
address

5. Data-Link layer

6. Frame:

7. Error Detection:

8. Network topology:

9. Physical addressing:
 Ethernet uses a 6-byte (46 bits) physical address that is
imprinted on the network interface card (NIC).
 Ex:
Most lan use a 48-bit (6 byte) physical address written as 12
hexadecimal digits, every byte (2 hexadecimal digits) is
separated by a colon, As Shown below….
07:01:02:01:2C:4B
A 6 byte (12 hexadecimal digits) Physical Address.

10. Network Layer
The network layer is the third level of the Open
Systems Interconnection Model (OSI Model) and the
layer that provides data routing paths for network
communication. Data is transferred in the form of
packets via logical network paths in an ordered
format controlled by the network layer.

12. Functions:
Packets
Logical Addressing
Internetworking
Routing
Error Handling and Diagnostics

13. Packets:

14. Data link layer in osi model-

15. THANK YOU