Network Virtualization Tools

Correct Answer: Virtual Switch

The correct answer is 'Virtual Switch'. A virtual switch is a software program that allows one virtual machine (VM) to communicate with another. It is a network virtualization technology typically used within a virtual environment to control and manage network communication among VMs. Virtual switches allow for communication between virtual machines on the same physical server and also manage communication with the physical network for VMs and the host. On the other hand, 'Virtual Router' is incorrect as it is a software function that replicates in software the functionality of a hardware-based Layer 3 IP routing, which has a significantly broader function then simply hosting isolated virtual networks on a single physical server. 'Virtual Private Network (VPN)' is also incorrect as VPN is a technology that creates a safe and encrypted connection over a less secure network, such as the internet. VPN technology was not designed to host multiple networks on a single physical server. 'Virtual Desktop Infrastructure (VDI)' is likewise incorrect, as VDI is a virtualization technology that hosts a desktop operating system and applications on a centralized server in a data center, which isn't related directly to network virtualization.

Correct Answer: Virtual Local Area Network (VLAN)

The best network virtualization technology to use to create separate environments on a single physical network would be a Virtual Local Area Network (VLAN). VLANs separate networking environments on the same physical network, permitting network administrators to segment networks without the need for separate physical infrastructure. On the other hand, Network Functions Virtualization (NFV) helps with optimizing network services themselves, not creating separate environments. A Virtual Machine Monitor (VMM) is associated with server virtualization, not network virtualization. Lastly, a Virtual Private Network (VPN) extends a private network across a public network, allowing users to send and receive data as if their computing devices were connected directly to the private network. This is different from segmenting a physical network into separate environments.

Correct Answer: Virtual Private Network (VPN)

The best choice in this scenario would be a Virtual Private Network (VPN). A VPN allows the creation of secure connections to a remote network over the Internet. It enables the company to securely access the internal web server remotely, by encrypting the data transferred over the network, thus preventing unauthorized access. On the other hand, Network Functions Virtualization (NFV) is used to virtualize network services rather than providing secure remote access. Virtual Machine Monitor (VMM) functions to manage and monitor the operations of virtual machines, and is unrelated to remote access or network security. Virtual Desktop Infrastructure (VDI) allows the running of user desktop inside a virtual machine that resides on a server, but it does not specifically provide a secure remote access to the network.