What action should an administrator take to increase the number of simultaneously migrating virtual machines from four to eight?

To increase the number of simultaneously migrating virtual machines from four to eight, adding a 10GigE network card to each ESXi host is the most effective solution. This upgrade significantly enhances network bandwidth, which is critical during the virtual machine migration process. Migrations involve transferring data over the network between the source and destination ESXi hosts. By increasing the available bandwidth, the data can move faster, allowing more simultaneous migrations to occur without bottlenecking or throttling due to insufficient network capacity.

In a virtualized environment, the speed at which data can be transmitted directly impacts the overall performance during tasks like VMotion, which is responsible for the live migration of virtual machines. Each migration generates a substantial amount of traffic, particularly when moving large datasets, and having higher network throughput allows for more simultaneous connections and data transfers.

Other choices do not directly address the network limitations that can hinder concurrent migrations. For instance, while adding more memory to the ESXi hosts may improve overall resource availability and system performance, it does not fundamentally change the network capacity for migrations. Configuring port mirroring primarily deals with traffic analysis rather than improving migration capability. Load balancing pertains to distributing workloads evenly but does not directly increase the number of migrations. Thus, upgrading the network infrastructure with