Network Layer 2 vs Layer 3: Understanding the Differences 30/03/2023 – Posted in: Technology – Tags: , , , ,

Time to Read: 3 minutes.

When it comes to computer networking, the network layer plays a critical role in how data is transmitted over a network. However, there are two different layers within the network layer that serve different functions: layer 2 and layer 3. In this article, we’ll explore the differences between these two layers and their importance in the networking world.

Layer 2: The Data Link Layer

The data link layer, also known as layer 2, is responsible for transmitting data between devices on the same network. This layer is responsible for addressing, error correction, and flow control. One of the key features of the data link layer is the Media Access Control (MAC) address, which is a unique identifier assigned to every network interface controller (NIC) on a network. This allows devices to identify and communicate with each other on the same network.

Some common protocols used at the data link layer include Ethernet, Wi-Fi, and Bluetooth.

Layer 3: The Network Layer

The network layer, also known as layer 3, is responsible for routing data between different networks. This layer is where the Internet Protocol (IP) resides, which is used to identify devices on different networks. The network layer also provides logical addressing, fragmentation and reassembly of data, and congestion control.

One of the key differences between the data link layer and the network layer is the scope of their functions. The data link layer is responsible for transmitting data within a network, while the network layer is responsible for transmitting data between networks.

Some common protocols used at the network layer include IP, Internet Control Message Protocol (ICMP), and Address Resolution Protocol (ARP).

Links to Network Layer 2 vs Layer 3 Resources

If you’re interested in learning more about the network layer, there are a wealth of resources available online. Here are a few links to get you started: