Some of the applications may be old and use client server or single tier web application design. Due to their age and architecture design, they lack many of the security improvements made in application and infrastructure security over the last few years. It assumes that the new datacenter has Active Directory or LDAP (Light Directory Access Protocol) services, a remote monitoring tool, a HIDS (Host Intrusion Detection System) tool, an operating system upgrade tool and a logging tool. The following security tools will likely be used for all future migrations.”]
Source: https://www.csoonline.com/article/2132388/steps-to-mitigate-risks-in-a-datacenter-move.html