Software-defined perimeter (SDP), also known as Zero Trust Network Access (ZTNA), is a new approach for securing remote access to business applications both on-premises and in the cloud. SDP is an integral part of Gartner’s Secure Access Service Edge (SASE) framework.
Enterprises have long relied on virtual private networks (VPNs) to connect mobile or remote users to applications and other network resources. But, traditional VPNs are poorly suited for the shift to the cloud and to the increase in work-from-home users. VPNs rely on appliances, such as firewalls or VPN concentrators, forcing remote users’ traffic to specific physical locations. This architecture adds latency and creates capacity constraints. Once connected through a VPN, users are trusted with access to all resources on the network, increasing the risk of malware propagation and data breach. And, to reach the VPN gateways, users must rely on the unpredictable. Overall, legacy VPN architectures expose the enterprise to attacks and adversely impact the user experience, especially when accessing cloud applications.