On a Layer 2 network, explain the difference between a switch and a hub.

Layer 2 Network Engineer Interview Question: Switch vs Hub

When distinguishing between a switch and a hub on a Layer 2 network, it's crucial to understand their fundamental differences:

Switch:

• Functionality: A switch operates at the data link layer of the OSI model and forwards data based on MAC addresses.
• Efficiency: Switches minimize network congestion and ensure efficient data transmission by creating dedicated connections between devices.
• Security: Switches offer better security as they only forward data to the intended recipient rather than broadcasting it to all devices.

Hub:

• Functionality: A hub operates at the physical layer of the OSI model and simply forwards data to all connected devices.
• Efficiency: Hubs are less efficient than switches as they pass all incoming data to all connected devices, leading to network congestion.
• Security: Hubs provide less security as data is broadcast to all devices, making it vulnerable to interception.

Therefore, in a Layer 2 network, switches offer superior performance, security, and efficiency compared to hubs.