Which of the following provides effective management assurance for a Wireless Local Area Network (WLAN)?

 The action that provides effective management assurance for a WLAN is establishing a VPN tunnel between the WLAN client device and a VPN concentrator. A VPN is a secure and encrypted connection that enables remote access to a private network over a public network, such as the internet. A VPN concentrator is a device that manages and authenticates the VPN connections, and provides encryption and decryption services. By establishing a VPN tunnel, the organization can protect the confidentiality, integrity, and availability of the data transmitted over the WLAN, and prevent unauthorized or malicious access to the network. The other options are not as effective as establishing a VPN tunnel, as they either do not provide sufficient security for the WLAN (A and B), or do not address the management assurance aspect (D). References: CISSP All-in-One Exam Guide, Eighth Edition, Chapter 4, page 167; Official (ISC)2 CISSP CBK Reference, Fifth Edition, Chapter 4, page 177.