OSI MODEL
- PHYSICAL LAYER :- This layer is primary layer of the osi model and consists of connection devices such as Ethernet cable, Token ring, Hubs, Repeaters and electrical specification for data connection.
- DATA LINK LAYER :- Data link layer encodes and decodes data packet into bits and using its transmission protocol it handles the errors in the physical layer. this is work on Switch. MAC address, NIC, Bridge, Framing, Encapsulation, or Error detection.
- NETWORK LAYER :- The Network layer adds the concepts of routing above the Data link layer. Tagging IP Address, Choose best path, Routing. Most used protocol in this layer is internet protocol(IP), Internet packet exchange(IPx), ARP, RARP etc.
- TRANSPORT LAYER :- In the fourth layer variable length data sequence has to be transferred from source to destination host through one or more network. This transport layer delivers data across network connection. The supported prrotocols at this layer are TCP(Transmission control protocol) UDP(User datagram protocol) and SPX(Sequential packet exchange).
- SESSION LAYER :- Create and manage the session via port number is know as session layer. Synchronization, Dialog, Control, Reconnection.
- PRESENTATION LAYER :- The presentation layer is the simplest in function of any piece of the OSI model. It handles syntax processing of message data such as format conversions and encryption/decryption needed to support the application layer above it. File Formats are Mp4, AVI, MKV, PNG, JPG etc.
- APPLICATION LAYER :- This is last layer of OSI model and this layer represents the data that is understood by the end user. The application layer supplies network services to end user application. Protocols are FTP, HTTP, HTTPS, TELNET, DNS, SMTP, POP etc..