What is the main advantage of using a Virtual Switch in vSphere?

Using a Virtual Switch in vSphere primarily serves the purpose of managing network traffic for multiple virtual machines (VMs) that reside within a host. It acts as a virtualized version of a physical switch, enabling communication not only between the VMs on the same host but also facilitating their access to external networks and resources.

The Virtual Switch allows for the creation of various network configurations and segments, enhancing security and performance by enabling features such as VLAN tagging, network policies, and load balancing. This means that administrators can optimize how data is transmitted between VMs, ensure that network traffic is properly routed, and isolate traffic as needed, which is especially important in multi-tenant environments or when adhering to specific compliance requirements.

The other options, while related to networking, do not encapsulate the broader and more fundamental advantage provided by a Virtual Switch. For instance, connecting only to external networks or facilitating only Internet access are limited aspects of its functionality, and increasing physical storage is outside the scope of what a Virtual Switch does. The core strength lies in its capability to efficiently and flexibly manage the internal network traffic among multiple VMs on a single host.