Which technology is best for isolating multiple networks on the same physical hardware?

A.  VPN

B.  VLAN

C.  Subnetting

D.  NAT

Answer:  B

Explanation:

VLAN (Virtual Local Area Network): A VLAN allows you to create logically segmented networks within physical networks. This enables better control and isolation of networks even when running on the same physical hardware. VLANs can isolate broadcast domains, thereby providing a higher level of security.

Here's a breakdown of the other options:

VPN (Virtual Private Network): VPNs are designed to securely connect distant networks over the internet, rather than isolating multiple networks on the same physical hardware.

Subnetting: While subnetting divides an IP network into various segments, it doesn't offer the isolation level required for multiple networks on the same physical hardware. The segmentation is logical but not designed for the purpose of isolation in the way that VLANs are.

NAT (Network Address Translation): NAT is used to map private IP addresses to a public IP address. It doesn't serve the purpose of isolating multiple networks on the same physical hardware.

Therefore, VLAN is the technology best suited for isolating multiple networks on the same physical hardware.