CIS Microsoft Windows 10 Enterprise Release 1909 Benchmark

5.9 (L2) Ensure 'Link-Layer Topology Discovery Mapper (lltdsvc)' is set to 'Disabled' (Scored)

ProfileApplicability:

 Level 2 (L2) - High Security/Sensitive Data Environment (limited functionality)

Description:

Creates a Network Map, consisting of PC and device topology (connectivity) information, and metadata describing each PC and device.

The recommended state for this setting is: Disabled .

Rationale:

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.

Audit:

Navigate to the UI Path articulated in the Remediation section and confirm it is set as prescribed. This group policy setting is backed by the following registry location:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\lltdsvc:Start

Remediation:

To establish the recommended configuration via GP, set the following UI path to: Disabled .

Computer Configuration\Policies\Windows Settings\Security Settings\System Services\Link-Layer Topology Discovery Mapper

Impact:

The Network Map will not function properly.

Default Value:

Manual

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