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The OSI Model

Brandon Kim

Explained Through a Human Anatomy Analogy

Layer 7: The Application Layer

I'm craving pizza.

Layer 7

The application layer is the highest level of the OSI model. This is the layer that users can visually see and interact with. It uses HTTP, FTP, DNS, and POP3 protocols.

Brandon thinks about grabbing his phone to order a pizza.

Layer 6: The Presentation Layer

Layer 6

The presentation layer ensures that the data is interpretted into an application acceptable format. This layer is often combined with the application layer, and it also is responsible for encryption. The presentation layer uses SSL or TLS protocols.

In order to tell his muscles that they need to grab the phone, the brain converts the thought into electrical impulses that the nervous system can understand.

Layer 5: The Session Layer

Layer 5

The session layer ensures that the each device on the network is able to exchange data. The layer creates and terminates communication sessions. There are control and tunneling protocols in this layer.

Brandon's nervous system allows the signals to reach his hand muscles to tell them to grab the phone.

Layer 4: Transport Layer

Layer 4

The transport layer makes sure that the data is accurate, delivered, and properly sequenced. This layer uses TCP and UDP protocols.

The neurons and neuroreceptors in Brandon's body make sure that the message is completely sent to the muscles. These nerves also can regulate the speed and flow of signals in the neural network.

Layer 3: The Network Layer

Layer 3

The network layer is responsible for the routing and transmission of data. It uses the IP protocol for this function. Data is also broken down into packets at this level.

Brandon's brain is the control center of the nervous system. It determines the most optimal path for the electrical signal to move along the network.

Layer 2: The Data Link Layer

Layer 2

The data link layer allows for each device in the network to have connections. This layer uses data link control (DLC) protocols.

The electrical impulse enters Brandon's left hand's muscles.

Layer 1: The Physical Layer

Layer 1

The first layer involves the physical wiring, cables, connectors, and other components that transmit signals. There are no protocols in this layer.

The hand muscles finally get the message that they need to contract in order for Brandon grab his phone!

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