Which two standards enable Ethernet to support FCoE? (Choose two.)

Priority Flow Control (PFC), defined by IEEE 802.1Qbb, ensures a lossless Ethernet fabric for FCoE by allowing flow control to be applied to specific traffic classes, preventing frame drops in congested links for Fibre Channel traffic.

Virtual Extensible LAN (VXLAN) is a tunneling protocol used for extending Layer 2 networks over a Layer 3 underlay, and it is not a foundational standard enabling FCoE.

Enhanced Transmission Selection (ETS), defined by IEEE 802.1Qaz, allows for flexible bandwidth allocation among different traffic classes, ensuring that FCoE traffic receives its guaranteed share of bandwidth without contention from other Ethernet traffic.

Address Resolution Protocol (ARP) maps IP addresses to MAC addresses and is a fundamental Layer 2/3 protocol for IP communication, but it does not specifically enable FCoE.

Virtual Port Channel (vPC) and Virtual Device Context (VDC) are Cisco-specific features for logical device aggregation and network virtualization, not the underlying standards enabling FCoE over Ethernet.