Which of the following networking devices operates at Layer1?
A.
Router B.
Firewall C.
Hub D.
Bridge.
C.
Which of the following networking devices operates at Layer1?
A.
Router
B.
Firewall
C.
Hub
D.
Bridge.
C.
The networking devices operate at different layers of the OSI (Open System Interconnection) model, which is a conceptual framework for communication between different systems.
Layer 1 of the OSI model is the Physical layer, which deals with the physical transmission of data over a network. The devices that operate at this layer are responsible for converting data into a physical signal and transmitting it over a network.
Out of the options provided, the device that operates at Layer 1 is a Hub. A hub is a networking device that connects multiple devices in a network and forwards data to all connected devices. It operates at the Physical layer and simply repeats the signal it receives on one port to all other ports.
A router operates at Layer 3 (Network layer) of the OSI model and is responsible for routing data packets between different networks. It uses logical addresses (IP addresses) to route packets between networks.
A firewall operates at Layers 3 and 4 (Network and Transport layers) of the OSI model and is responsible for filtering network traffic based on predefined rules. It inspects packets and decides whether to allow or block them based on their source, destination, protocol, and other criteria.
A bridge operates at Layer 2 (Data Link layer) of the OSI model and is responsible for forwarding data packets between different segments of a network. It uses MAC (Media Access Control) addresses to forward packets between segments.
In summary, a hub is the networking device that operates at Layer 1 of the OSI model and is responsible for transmitting data over a network.