OSI Model:
Open System
Interconnection is a reference model to describe how data communication takes
place between one computer to other computer in a network.
it was proposed by
International Organization for Standardization (ISO)
- OSI is evolved from experiences with ARPANET
Format Layer Brief Function
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Data -- Application Layer -- DHCP,
FTP, HTTP
Data -- Presentation Layer -- File type ex: JPEG, TXT;
Compression
Data -- Session Layer -- Security, connection
establishment, connection release, type of communication
Segment -- Transport Layer --
Error control, messages to segments, TCP/UDP
Packet -- Network Layer -- Logical Address & Translation logical to Physical
address
Frame -- Data link Layer -- Raw data to logical structure called Frame, A
