Remote access segmentation means placing vendor or contractor connections in a limited network zone instead of allowing them direct reach into core systems. In practice, remote maintenance traffic is routed through controlled jump hosts, VPNs, firewalls, and strict identity checks so each session can touch only the devices or services it truly needs.
This matters because third-party access is a common path into operational technology and business networks. If a contractor account, support tool, or remote desktop session is compromised, segmentation helps prevent the attacker from moving laterally to critical assets such as controllers, firmware update servers, or billing systems. Defenders use it with least privilege, time-bound access, logging, and approval workflows; attackers try to bypass it by stealing credentials or abusing poorly separated management planes. Good segmentation reduces the blast radius of a breach and makes remote support safer to operate.