Which OSI layer includes technologies like CobraNet, UDP, and AVB?

The correct choice is the Data Link Layer. This layer is responsible for node-to-node data transfer and manages error correction from the Physical Layer, ensuring that data packets are framed for transmission over the network. Technologies such as CobraNet, which is designed for transporting audio over Ethernet, as well as Audio Video Bridging (AVB) and User Datagram Protocol (UDP), are components commonly associated with this layer.

CobraNet operates on the Ethernet standard and relies on the capabilities of the Data Link Layer to ensure timely and reliable delivery of audio data. AVB enhances Ethernet by providing mechanisms that allow for precise timing and synchronization, making it ideal for real-time audio and video applications. Additionally, while UDP functions at the Transport Layer, its operation is heavily influenced by how it interfaces with the protocols and technologies defined at the Data Link Layer.

In this context, understanding that CobraNet and AVB are designed specifically to facilitate audio and video distribution over Ethernet demonstrates the Data Link Layer’s crucial role in supporting applications where timely and synchronized data transfer is essential.