Creates a Network Map, consisting of PC and device topology (connectivity) information, and metadata describing each PC and device. The feature that this service enables could potentially be used for unauthorized discovery and connection to network devices. Disabling the service helps to prevent responses to requests for network topology discovery in high security environments. Default: Manual. Counter Measure: The recommended state for this setting is Disabled. Potential Impact: The Network Map will not function properly. Fix: (1) GPO: Computer Configuration\Windows Settings\Security Settings\System Services\Link-Layer Topology Discovery Mapper (2) REG: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\lltdsvc!Start