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The OSI Model
Transcript of The OSI Model
The OSI (Open System Interconnect) model was created by the International Organization for Standardization (ISO) in 1984
It defines all of the basic services a network should provide
The model is divided into seven layers, each of which plays a key role in processing data and requests, enabling data to be transmitted between any two points in a network
Each layer interacts directly with the one beneath it and provides functionality for the layer above it
The OSI model...
Helps us maintain consistency within all types of network protocols and services
Is not intended to be specific to any particular scenario or to provide a sufficient level of detail to precisely define the services of a network
There are a few mnemonics you could use to help you remember the seven layers:
Pick your favourite or make up your own!
Click the right arrow below to start going through each layer in detail...
...the OSI model helps us to ensure interoperability
Whilst the OSI model isn't implemented in the real world (that's where the TCP/IP model comes in) it's still very useful for two main reasons:
1. It aids in providing a clearer understanding of all the functions and processes involved in networking
2. It can be utilised to help troubleshoot complex problems if you work from the
physical layer up
- it's no good if you end up spending hours configuring an application when the actual problem was that a cable had come loose!
Click the arrows below to move through this Prezi and learn about the OSI model
Have a look at this video which helps to explain and differentiate the physical and data link layers:
You can mute/unmute the background music by clicking the speaker icon in the bottom left, below this text. This button works independent of any videos.
Best viewed in full screen
Provides network access for applications (e.g. web browsers, email clients)
Features protocols including:
HTTP, HTTPS, DHCP, DNS, FTP, SMTP
Translates data into a format usable by the application layer above
Allows applications on connecting systems to establish a session
Provides synchronisation between communicating computers
Manages and terminates sessions as needed, determining how communications will occur
Deals with authentication, authorisation and session restoration
Features VPN protocols such as PPTP and L2TP
Segments and reassembles data into data streams
Establishes, maintains and ensures orderly termination of virtual circuits
Can also detect faults in data transfer and can provide recovery and information flow control
TCP and UDP
The network layer is mostly concerned with routing
Data units are called 'packets'
IP (including logical addressing i.e. IP addressing)
data transmission services by managing the physical layer below
Switching, bridging, NICs
Data units are called 'frames'
Ethernet II, 802.3, 802.11, physical addressing i.e. MAC addressing, VLANs
Concerned with the ‘nuts & bolts’ of the network; the electrical, the mechanical and timing issues etc.
Hubs, repeaters, DCE and DTE
Electrical signals, radio waves
Background music by Christopher Bingham: www.youtube.com/watch?v=XGMoyJbI-O4
'OSI Model Application Layer compared to TCP/IP Application Layer' by 'Chunte7': http://bit.ly/1z94A3e
CC BY-SA 3.0 / cropped from original
'Switch!' by Andrew Hart: http://bit.ly/1DBU9Yq
CC BY-SA 2.0
'facebook website screenshot' by Spencer E Holtaway: http://bit.ly/1DBTRRa
CC BY-ND 2.0
Installing a replacement hard drive: http://bit.ly/1DBUlqo
'Email-Marketing-Envelope' by Yoel Ben-Avraham: http://bit.ly/1DBW5jy
CC BY-ND 2.0
VPN authentication : http://bit.ly/1DBWqmc
CC BY 3.0
Traffic lights: http://bit.ly/1DBX2sf
Wireless router: http://bit.ly/1DBXcQe
'Avaya ERS 2550T-PWR, a 50-port Ethernet switch' by 'Geek2003': http://bit.ly/1DBXlTU
CC BY-SA 3.0
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