Understanding OSI Layer 3

Commonly referred to as the networking layer of the OSI model, layer 3 provides the structure relating to how data can be efficiently transferred from one network to another. Let’s go back to the mobile home community example. .

When a unit is placed in a mobile home community, it is typically located on a lot (often referred to as a space). The lot address can be used for postal service purposes. As you know, if you want to mail a package from one mobile home to another, serial numbers won’t work. But if you address the package properly, using the format the postal service requires, we have some assurance of delivery.

When it comes to computer networking, our postal service consists of computing devices known as routers. Functioning at layer 3 requires the creation of an outside envelope over the layer 2 frame, that includes the layer 3 address of the sender of the packet, along with the layer 3 address of the recipient.

Layer 3 addresses are divided in a fashion that identifies a specific network address and a specific host or group of hosts. When it is determined that the recipient’s network address is different from the sender’s network address, packets are directed to the network’s router for delivery handling.

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