In a traditional virtualized data center, what shared network resource do VMs on the same host use to communicate?

In a traditional virtualized data center, virtual machines (VMs) on the same host typically use a virtual switch to facilitate communication. A virtual switch operates similarly to a physical network switch, allowing multiple VMs to communicate with each other as well as access external networks if configured to do so. It provides a layer of abstraction that enables networking functionality within the host without the need for additional physical hardware.

The virtual switch handles data traffic between VMs, allowing them to share the same physical network interface and manage data flow efficiently. This capability is critical for ensuring that VMs can intercommunicate in a secure and isolated environment.

While virtual NICs, or network interface controllers, exist for each VM, they function as endpoints that connect to the virtual switches. A region typically refers to a geographical area containing multiple data centers rather than a resource for communication between VMs. LAN refers to local area networks, which represent a broader concept that encompasses physical and virtual networking but is not specific to the virtualized environment of a single host. Hence, the virtual switch stands out as the primary tool for routing and managing VM communication within the same host.