What term describes the capability of L2VPN data service to ensure traffic isolation for different customers?

The term that best describes the capability of an L2VPN (Layer 2 Virtual Private Network) data service to ensure traffic isolation for different customers is segmentation. This concept involves dividing a network into smaller, isolated segments, allowing each customer to have their own virtualized space while preventing their traffic from overlapping with others. In the context of L2VPN, segmentation is crucial for maintaining privacy and security among multiple customers who share the same physical infrastructure.

Tunneling refers to the technique used to encapsulate packets within another packet type, facilitating the transmission of data over a different protocol. While tunneling can contribute to traffic isolation by separating customer traffic, it does not inherently provide the robustness of segmentation when it comes to defining virtual spaces.

Bridging involves the process of connecting different network segments at the data link layer but does not fulfill the function of isolating traffic specific to customer contexts. Similarly, routing is typically focused on directing packets between different networks and does not deal with traffic isolation within the same layer.

Thus, segmentation is the most appropriate term for defining the isolation of traffic in an L2VPN service, ensuring that each customer's data remains separate and secure.