Virtual Network

The task at hand is to create a secure connection between two virtual networks that are across the internet. The best solution here is to 'Implement a site-to-site VPN.' Virtual Private Networks (VPNs) create a secure path between two or more devices on the internet. Site-to-site VPNs are especially used for connecting distinct networks at different geographical locations, making it the ideal choice in this situation. 'Set up remote database replication' is not the appropriate answer because it deals with copying and maintaining database objects, which isn't relevant to creating a secure network connection. 'Enable remote desktop protocol' is also incorrect because while it does allow for remote connections, it is not specifically designed for forming a secure link between two networks. Finally, 'Install a next-generation firewall' although provides advanced security features, it does not set up a secure connection between two networks. Therefore the only answer that caters to all the requirements of the question is 'Implement a site-to-site VPN.'

The developer can allocate more resources to the development VM to optimize the performance. Allocating more resources such as CPU, RAM, or disk space improves how the VM performs. On the contrary, adding physical switches to the network doesn't directly improve the performance of a VM as these primarily manage network traffic between devices. Switching to a different hypervisor could be a possible solution but it's not optimal since it involves a lot of setup and configuration time, and it's not guaranteed to solve the performance issue. Changing the IP addressing scheme does not affect the performance of a VM either; it just changes how the VMs are networked together.

The best way to ensure that critical virtual machines are receiving priority access to network resources is to 'Implement Quality of Service (QoS) policies'. QoS policies can prioritize traffic to certain virtual machines or applications, ensuring critical systems are given the network resources they need. The other options are incorrect. Creating an additional VLAN could segment the network but wouldn't necessarily prioritize traffic. Enabling port mirroring is more for monitoring traffic than managing resource allocation. Configure split-horizon routing prevents route loops in a network and does not provide priority access to network resources to specific machines.