Which component controls network traffic flow between virtual machines and the host computer?

The component that controls network traffic flow between virtual machines and the host computer is the virtual switch. A virtual switch functions in a similar way to a physical network switch but operates within a virtualized environment. It enables communication between virtual machines (VMs) on the same host and facilitates connectivity to external networks.

By using a virtual switch, VMs can communicate with each other and also access external networks, which is essential for their operation in cloud environments. The virtual switch manages the data packets sent and received by VMs, ensuring that they reach the correct destination, whether that is another VM or an external resource.

In contrast, the other components mentioned have specific roles: a virtual NIC (Network Interface Card) is responsible for each VM's network connections but does not control traffic flow overall; virtual storage pertains to the storage aspect of VMs, handling data storage needs; and a virtual HBA (Host Bus Adapter) manages storage network connections.

By understanding the role of the virtual switch, you can see its importance in managing network traffic flow effectively in a virtualized cloud environment.