Final answer:
Ethernet is a scalable technology that operates based on a best-effort delivery system, but it is not inherently secure or a guaranteed delivery system.
Step-by-step explanation:
Ethernet is a widely used technology for local area networks (LANs). It is a scalable solution, meaning it can support a varying number of devices and network speeds. Ethernet operates based on a best-effort delivery system, where data packets are sent without a guarantee of delivery. However, it is not inherently secure and does not provide a guaranteed delivery system.