Final answer:
A hub extends a collision domain, meaning all devices share the same collision domain, leading to possible inefficiencies and data collisions. A Layer 2 LAN switch divides collision domains, with each port representing a separate collision domain, thus optimizing network traffic and reducing collisions.
Step-by-step explanation:
A hub operates at the physical layer of the OSI model and simply repeats any signals it receives on one port to all other ports, causing all connected devices to share a single collision domain. This means that if one device sends a signal, it can collide with signals from other devices, leading to network congestion and slower data transmission. On the other hand, a switch operates at the data link layer of the OSI model and creates separate collision domains for each of its ports. This allows for simultaneous and independent data transmission between devices connected to different ports, resulting in faster and more efficient communication.
The significant difference between a hub and a Layer 2 LAN switch is: A hub extends a collision domain, and a switch divides collision domains. A hub is a basic networking device that connects multiple computers or network devices together. However, it does not manage any traffic that comes through it; any data packet entering a port is broadcasted out to the rest of the ports. This means all devices connected through the hub share the same collision domain, which can lead to network inefficiencies and collisions.
A Layer 2 switch, on the other hand, operates at the data link layer and is more intelligent. It can identify devices on each port and can send data directly to the correct destination port. This creates separate collision domains for each port, resulting in more efficient use of the network bandwidth and reducing the chances of collision.