Vamsi Pavan’s Place

OSI Layers (Open Systems Interconnection)
Physical Layer
It deals with data at signals level electric impluses, radio , light waves. Needs support from hardware.
This layer conveys the bit stream - electrical impulse, light or radio signal — through the network at the electrical and mechanical level.
Data link layer
Message is decoded into bits
divided into Media Access Control(MAC) and Logical Link Control (LLC). The MAC sublayer controls how a computer on the network gains access to the data and permission to transmit it. The LLC layer controls frame synchronization, flow control and error checking
Network layer
Switching and Routing. Which route to take. Maintains virtual paths.
Transport Layer
Ensures the complete transmission of the packets
Session Layer
Presentations Layer
Encryption and decryption of data.
Application layer

TCP/IP Layers