On which OSI layer does a hub operate?

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Study for the Network Security Instructional Terminology Test. Enhance your knowledge with multiple choice questions, each accompanied by hints and explanations. Ensure readiness for your exam!

Multiple Choice

On which OSI layer does a hub operate?

Explanation:
Hubs operate at the Physical layer because their job is to transmit raw electrical signals over the cabling without interpreting the data. A hub acts as a simple repeater: it takes the incoming signal and copies it to all other ports, so every connected device sees the same signal. It does not examine frames, read MAC addresses, or forward data based on addressing—that kind processing happens at the Data Link layer with switches and bridges. Since no data-link processing occurs, all ports share the same collision domain, which is a hallmark of the physical-layer function.

Hubs operate at the Physical layer because their job is to transmit raw electrical signals over the cabling without interpreting the data. A hub acts as a simple repeater: it takes the incoming signal and copies it to all other ports, so every connected device sees the same signal. It does not examine frames, read MAC addresses, or forward data based on addressing—that kind processing happens at the Data Link layer with switches and bridges. Since no data-link processing occurs, all ports share the same collision domain, which is a hallmark of the physical-layer function.

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