Fibre Channel over Ethernet (FCoE) is a protocol that encapsulates Fibre Channel frames into Ethernet frames, permitting both storage and Ethernet network traffic to use a common Ethernet infrastructure. This technology simplifies network design and reduces the number of network components required in a datacenter. Other options such as Multipath TCP, IS-IS, and Ethernet Fabric, do not specifically encapsulate Fibre Channel over Ethernet networks, so they are not the correct answers for the given question.