Which items are typically included in an Ethernet header and trailer?

The Ethernet frame is structured in a standardized way to facilitate communication over a network. The items included in an Ethernet header and trailer are critical for ensuring that data is transmitted accurately and reaches the correct destination.

The correct answer includes the source MAC address and destination MAC address, which are essential for identifying the sending and receiving devices on the network. Each device on an Ethernet network has a unique Media Access Control (MAC) address, which allows devices on the same local network to communicate effectively. The presence of error checking information, typically a Frame Check Sequence (FCS), at the end of the frame ensures that the data has not been corrupted during transmission. This helps maintain data integrity by allowing the receiving device to verify the accuracy of the transmitted data.

In contrast, options that include IP addresses pertain more to higher network layers, specifically the network layer (Layer 3) of the OSI model, whereas Ethernet operates primarily at the data link layer (Layer 2). Therefore, incorporating IP addresses in an Ethernet context would be inaccurate.

Furthermore, while concepts like packet sequence numbers and transmission priority levels are relevant in different contexts, they do not form part of the standard Ethernet frame structure. This reinforces the importance of recognizing the specific components that characterize the Ethernet protocol