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Which of the following statements best describes a hub?
A hub is a physical layer (Layer 1) networking device used to connect multiple Ethernet devices in a network. Unlike switches or routers, hubs do not inspect or process frame headers. Instead, they perform a simple task:
Receive a signal (electrical or optical) on one port
Replicate that signal identically to all other ports
This means the hub does not examine Layer 2 (MAC addresses) or Layer 3 (IP addresses) and does not perform intelligent forwarding. It merely broadcasts all incoming traffic to every other connected device, often resulting in high collision domains and poor efficiency.
Option A describes a repeater, not a hub.
Option C describes a switch (Layer 2 device).
Option D describes a router (Layer 3 device).
Option B is correct: A hub does not inspect headers and replicates traffic blindly.
Nokia IP Networking Fundamentals Study Guide -- Chapter: 'Network Devices and OSI Model'
CompTIA Network+ and Cisco CCNA foundational guides (for universally accepted hardware behavior)