Which option is not considered an attribute of Carrier Ethernet?

Carrier Ethernet encompasses a variety of attributes that enhance the capabilities of Ethernet in a carrier-grade environment. Scalability refers to the ability to increase network capacity without major changes to infrastructure, which is essential for providers handling growing customer demands. Quality of Service (QoS) is crucial as it ensures different types of traffic are prioritized appropriately, allowing for consistent performance and user experience, particularly for latency-sensitive applications. Reliability is another key attribute, as it ensures that the service remains operational with minimal downtime, which is critical for enterprise applications and users needing continuous access.

While speed is an important factor in network services, "Speed of Service" is not commonly highlighted as a standalone attribute of Carrier Ethernet in the same way as the other attributes. Instead, Carrier Ethernet leverages existing Ethernet speeds (like 10 Mbps, 100 Mbps, or higher) and focuses more on the consistency, manageability, and performance guarantees associated with delivering those speeds reliably and at scale. Thus, while speed is a characteristic of the technology, it does not encapsulate the defining attributes typically associated with Carrier Ethernet services.