According to the Marvis - Mist document, unhappy clients is a query that can be used in Marvis to identify users who cannot connect to the network. Unhappy clients shows a list of clients who have experienced poor service level expectations (SLEs) such as connection failures, coverage issues, or low throughput.
References: https://www.mist.com/documentation/marvis/

Two correct statements about Juniper Mist Dynamic Packet Capture are that no configuration is necessary for Mist's Dynamic Packet Capture and it is automatically attached to a client event displayed on the Insights page. So the correct answers are A. No configuration is necessary for Mist's Dynamic Packet Capture and B.
It is automatically attached to a client event displayed on the Insights page.

According to the Cisco Catalyst 9800 Series Wireless Controller Software Configuration Guide1, roaming is the process of moving a wireless client device from one AP to another while maintaining network connectivity. The client device determines when it is time to connect to another AP based on its own roaming algorithm and criteria.
References: https://www.cisco.com/c/en/us/td/docs/wireless/controller/9800/17-2/config-guide/b_wl_17_2_cg
/roaming.html

InJuniper Networks Mist AI Wireless, Service Level Expectations (SLEs) are used to measure and assure real user experience across the wireless network. Each SLE is built on specificclassifiers, which break down failures into root causes such as DHCP, DNS, authentication, RF conditions, or application issues.
Understanding which SLEs rely on DHCP classification is essential for accurate troubleshooting.
The two Wireless Assurance SLEs that include aDHCP classifierareSuccessful ConnectsandTime to Connect.
TheSuccessful Connects SLEmeasures whether client devices are able to complete the full connection process successfully. This process includes association, authentication, and critically,DHCP address assignment. If a client fails to obtain an IP address, the connection is considered unsuccessful, and the failure is explicitly classified as a DHCP issue within this SLE.
TheTime to Connect SLEmeasures how long it takes for a client to connect from the moment it initiates association until it is fully usable on the network. One of the key components of this timeline is theDHCP transaction time. Slow DHCP responses, retransmissions, or server delays directly increase the overall connection time, and Mist classifies these delays under DHCP within the Time to Connect SLE.
The other options are incorrect for the following reasons:
* Roaming SLEfocuses on re-association, authentication, and mobility events, not DHCP, since IP addressing is typically retained during roaming.
* Coverage SLEevaluates RF signal strength, SNR, and cell overlap, with no dependency on DHCP.
* Throughput SLEmeasures data transfer performance after connectivity is established and does not analyze DHCP behavior.
Therefore, the correct answer isSuccessful Connects and Time to Connect, as both SLEs directly depend on and classifyDHCP-related performance and failureswithin Mist Wireless Assurance.

When deploying multiple Mist APs across many sites in your network and grouping similar devices together to easily apply consistent WxLAN policies across multiple sites, you should use device profiles.