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- Open with title and specify OSI acronym will be used throughout the ppt
- Before introducing OSI. Talk about net model and compare it with blueprint
- ISO is a standards body, 7 layers, adjacent layer interaction and vendor interoperability
- A lot of engineers prefer to use mnemonics to remember layers of OSI in the right order
- 7 layers are split into 2 categories upper and lower
- L7: User interact with app which enables indirect interaction b/w user and app protocol
- L6: Offers data formatting service to L7 like defining encoding, encryption and compression
- L5: The services offered by Session Layer are generally implemented in application environments using remote procedure calls (RPCs)
- L4: This layer does not send data but is responsible for the transmission of data. L4 provides session multiplexing
- L3: Provides inter-network communication, logical addressing, path selection and enables hosts to communicate with each other
- L2: Provides intra-network communication, protocols depend on physical device (ethernet, 802.11) and MAC used to identify hosts/nodes within a network
- L1: controls the signaling and transferring of raw bits onto the physical medium, L2 and L1 go hand in hand to transmit of data.
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