Which of the following devices does not operate on the Network Layer of the OSI model?

The correct answer is that a hub does not operate on the Network Layer of the OSI model. Hubs function at the physical layer, which is the first layer of the OSI model. Their primary role is to transmit data packets to all connected devices within a network segment, without inspecting or managing the packet data.

In contrast, routers function at the Network Layer, making decisions about packet forwarding based on IP addresses. Switches operate at the Data Link Layer, where they make decisions based on MAC addresses to send frames to the appropriate devices within a local network. Bridges also operate at the Data Link Layer, filtering traffic and connecting segments but do not have capabilities at the Network Layer like routers do.

Therefore, among the options provided, a hub is the only device that does not engage with the Network Layer, focusing instead solely on the physical transmission of data.