For Ed to ensure a secure connection from an administrative network to a DMZ using Secure Shell (SSH), what type of system is commonly utilized to facilitate secure connectivity across security boundaries for network segments with varying levels of security?

To enable secure access to a network with a different security profile, jump boxes are commonly used. In this scenario, Ed can deploy a jump box in the DMZ to allow users within his administrative zone to carry out tasks without directly connecting to the world-exposed DMZ. This approach helps to maintain the security of administrative systems, while also facilitating easier monitoring and maintenance. While an intrusion prevention system (IPS) can be used to monitor and block unwanted traffic, it is not employed for remote access. Network Address Translation (NAT) gateways perform network address translation and are typically used to reduce the number of public IP addresses used and provide limited security for systems behind it, but not to provide secure connections between networks. Routers are used to link to networks but do not provide secure access as described in the question.