Which statement is true about Ethernet frames?

Ethernet frames include a Type/Length field that serves an important function in the communication process. This field indicates the type of protocol encapsulated in the frame or, alternatively, provides the length of the data payload. By doing so, it enables the receiving device to understand how to process the information contained within the frame. This versatility is crucial for supporting various network protocols running over Ethernet, which allows for the efficient integration of multiple protocols within a single network infrastructure.

The presence of the Type/Length field also facilitates protocol identification, enabling compatibility with various upper-layer protocols such as IP, ARP, and others. Without this field, the receiving endpoints would struggle to interpret the data transmitted over the network, leading to communication failures.

In contrast, the other statements do not accurately describe the characteristics of Ethernet frames. They do not exclusively carry IP addresses, are designed to enable communication between multiple devices rather than being limited to one, and they typically do not provide encryption unless combined with additional security protocols.