What feature allows a WDS server to send a bootable WIM copy to be installed by multiple clients simultaneously?

The feature that allows a Windows Deployment Services (WDS) server to send a bootable WIM (Windows Imaging Format) image to be installed by multiple clients simultaneously is multicast.

Multicast technology enables a single data stream to be sent to multiple clients at once, rather than sending individual streams to every requesting client. This is particularly beneficial in a deployment scenario where several machines need to receive the same image simultaneously. By using multicast, the network bandwidth is utilized more efficiently, reducing the load on the server and the network, while speeding up the deployment process.

Although the other options may have specific roles in networking and security, they do not relate directly to the process of sending a bootable WIM image to multiple clients in a deployment scenario. Port mirroring is used for monitoring traffic, Kerberos is a network authentication protocol, and live migration pertains to moving running virtual machines seamlessly. None of these addresses the efficient delivery of a bootable image like multicast does.