osi Flashcards
what are networking standards ?
networking standards are rules that allow computer systems to communicate across networks. - standards have been created to ensure devices can exchange data and work together
what is the seven layer OSI model ?
The OSI model is split into 7 layers - the model is used to visualize the different parts of the network as each of the 7 layers has a specific role -splitting a network design into layers is beneficial to programmers as it simplifies design, making it easier to modify and use - each layer has a certain purpose and is associated with different protocols
what does OSI stand for ?
open system interconnection
Name the 7 layers of the OSI model
Application
Presentation
Session
Transport
Network
Data Link
Physical
Describe the application layer
Allows humans and software applications to use the network e.g. browser (HTTP/HTTPS) and email (SMTP) and file transfer (FTP)
Describe the presentation layer
displays data in a standard format that other devices can accept and understand
Describe the session layer?
the session layer establishes a connection between computers allowing data to be sent between them - data can be synchronised in each session to allow for efficient data transfer
Describe the transport layer
- TCP breaks the data down into data packets - this layer makes sure the data is sent and received in the correct order and reassembled at the destination without errors
Describe the network layer?
- IP is responsible for addressing and routing data packets - the optimal route for the data to take is calculated in this layer - Also known as the internet layer
What is the network layer also know as ?
The internet layer
Describe the data link layer
- Ethernet sets out the format of data packets. - This layer handles transmission errors and passes data to the physical layer
Describe the physical layer
This layer converts the data packets into bits so they can be transferred across a physical connection using routers and switches
