Which of the following after-sales test tools is WLAN Planning and Design Service?

The Huawei WLAN Tester is a professional mobile software tool designed for WLAN network deployment and maintenance. It is used by network engineers for tasks such as site surveys, network acceptance testing, and troubleshooting after a WLAN has been deployed. It provides functionalities like Wi-Fi signal testing, performance measurement (e.g., delay, packet loss), and roaming tests, making it a key after-sales test tool for the WLAN Planning and Design Service.

A. eNSP: The Enterprise Network Simulation Platform (eNSP) is a simulator for pre-sales solution design, training, and learning, not an on-site, after-sales field testing tool.
B. GNEEC WLAN: The Global Network Evolution & Experience Center (GNEEC) is a comprehensive lab and solution center, not a portable field test tool for individual engineers.
C. WLAN DNS3: This appears to be a non-existent or incorrect tool name. DNS (Domain Name System) is a network protocol, not a WLAN planning or testing tool.

1. Huawei Enterprise Support. "WLAN Tester App." Tools Documentation. "WLAN Tester is a piece of professional mobile software developed by Huawei for WLAN network deployment and maintenance... It can be used to test the Wi-Fi signal, performance, and roaming." This confirms its role as a deployment and after-sales tool.

2. Huawei AppGallery. "WLAN Tester." The application description details its functions for WLAN acceptance, troubleshooting, and optimization, clearly positioning it as a tool for field engineers during and after deployment.