Explanation/Reference:
Explanation:
The CNA is a single adapter in the server (that attaches to PCI Express Slot) which can provide the functionalities of both Ethernet NIC (Network Interface Cards) and FC HBA (Host Bus Adapters) virtually.
That means, the server still sees two Interfaces and it sends the IP traffic to the NIC and FC traffic to the HBA. But the CNA collects both of them, and transports it over a single Ethernet cable after having wrapped all the Fiber Channel (FC) frames to Ethernet frames.
Reference: http://www.excitingip.com/960/fcoe-fiber-channel-over-ethernet-need-enhancements- advantages-disadvantages/