What is a key characteristic of Ethernet Private Line service?

The key characteristic of Ethernet Private Line service is that it offers dedicated bandwidth between two endpoints. This means that the connection is exclusively used by the two parties involved, ensuring that they have a consistent and reliable bandwidth that is not affected by other users or traffic. This dedicated nature is crucial for applications that require consistent performance and low latency, such as video conferencing and real-time data transfer.

The other options describe features that do not align with the fundamental principles of Ethernet Private Line services. Shared access among multiple users typically pertains to Ethernet services like Ethernet Virtual Private Line or other shared services, which is contrary to the dedicated nature of Private Line. A mesh network configuration generally refers to a network topology rather than a service type, which is not applicable to Ethernet Private Line. Data buffering capabilities might be a feature in various networking scenarios, but it is not a defining characteristic of Ethernet Private Line service, which focuses on the dedicated bandwidth aspect instead.