A ____ works at the data link layer and forwards data frames. A. Protocol B. Switch C. TCP/IP D. Router

In this question, we are trying to identify the correct term that describes a device working at the data link layer and forwarding data frames. Let's analyze the options provided:

1. Protocol: This refers to a set of rules for data transmission, but it does not describe a physical device.

2. Switch: This is a device that operates at the data link layer (Layer 2 of the OSI model) and is responsible for forwarding data frames based on MAC addresses.

3. TCP/IP: This stands for Transmission Control Protocol/Internet Protocol, which is a suite of communication protocols but not a device.

4. Router: This operates at the network layer (Layer 3 of the OSI model) and is used to route packets between different networks.

Conclusion

Based on the definitions, the answer clearly indicates that a "Switch" fits the description best, as it operates at the data link layer and forwards data frames.

Final Answer

B. Switch