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Software-defined-perimeter (SDP)


Software-defined perimeter (SDP) is a policy-based security framework that uses identity to control access to resources. Essentially, an SDP functions as a broker between internal applications and end users. The framework was developed by the Cloud Security Alliance (CSA) and is based on the U.S. Department of Defense's "need to know" access model.

CSA's SDP framework allows network engineers to segment network resources with security policies in a way that mirrors a physically-defined network perimeter. When the authentication process is complete, trusted devices are given a unique and temporary connection to the network infrastructure. Unauthorized users and devices that do not comply with policy will not be able to connect.

With SDP network security software, network administrators are able to dynamically deploy micro-perimeters for hybrid and multi-cloud environments to isolate services. SDP software is purpose-built to give medium and large organizations the perimeter security model needed for zero trust applications and workload-centric network connectivity between on-premises and cloud environments. In addition to limiting attack surfaces, SDP software also eliminates vendor chaos by allowing for installation on any host, without requiring network reconfiguration or hardware appliance lock-in.

SDP vs. VPN

Any device that accesses an isolated network through a VPN presents a risk of bringing malware to that network environment unless there is a requirement in the VPN connection process to assesses the state of the connecting device. Without an inspection to determine whether the connecting device complies with an organization's security policies, attackers with stolen or excessive credentials can access network resources, including switches and routers.

The problem is that VPN tunneling protocols were created before distributed computing in hybrid and cloud environments became the norm.

Network administrators who manage VPNs should consider adding software-defined perimeter (SDP) components to their VPN infrastructure. The addition of SDP programming gives medium and large organizations the ability to use a zero trust model for access to both on-premises and cloud network environments.

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