The growth and rapid, almost frantic, change of communications technology has left many familiar standbys, which many people likely thought would be around forever, in the dust of history. Consider the landline telephone: How many have departed that technology in favor of its mobile equivalent? Something similar is happening in the communications space as well, as multiprotocol label switching (MPLS) finds itself under fire in favor of other technologies, such as software-defined wide-area networking. However, MPLS is still relevant, as it’s offering a few specific use cases that no other technology can match, at least for now.