ACMA Cheat Sheet 2026

The 30 highest-yield ACMA facts, distilled from real exam questions. Print it, save it as a PDF, or study it here — free, no sign-up.

1. Which 802.11 standard introduced MU-MIMO technology for downlink transmissions to multiple clients simultaneously? → 802.11ac Wave 2
2. In Aruba, what does 'tunnel mode' for an AP's SSID mean for client traffic? → Client traffic is encapsulated and forwarded to the Mobility Controller for processing
3. What is the purpose of configuring an AP's 'LMS IP' (Local Management Switch) during deployment? → To specify the primary controller the AP should connect to
4. Which unit is used to express antenna gain relative to an isotropic radiator? → dBi
5. Which authentication method does WPA3-Personal use to replace the traditional PSK handshake and resist offline dictionary attacks? → SAE (Simultaneous Authentication of Equals)
6. What is the purpose of a VLAN in network security? → To segment the network into isolated subnets, improving security and traffic management
7. In a multi-floor office building, what is the primary concern when designing WLAN coverage to avoid co-channel interference between floors? → Selecting non-overlapping channels and controlling vertical signal bleed
8. What does WPA3 encryption provide in wireless networks? → It provides enhanced security with stronger encryption and protection against attacks
9. What is the PRIMARY ethical obligation of a certified Aruba Certified Mobility Associate professional regarding confidential information? → Protect it from unauthorized disclosure at all times
10. What Aruba deployment feature allows different SSIDs on the same AP to be forwarded to different upstream VLANs? → Per-SSID VLAN mapping
11. In 802.11 networks, what is the function of the ACK (Acknowledgment) frame? → To confirm successful receipt of a unicast data frame
12. Which practice improves the security of access point deployment implementations? → Input validation and principle of least privilege
13. What is the maximum number of controllers that can form an Aruba controller cluster? → 4
14. Which approach best demonstrates mastery of rf principles in ACMA practice? → Applying principles to novel situations with sound judgment
15. Which Wi-Fi frame type is responsible for negotiating association between a client and an AP? → Management frame
16. In Aruba ClearPass, what is the purpose of the 'Authentication Source' configuration? → Specifies where user credentials are validated, such as AD or LDAP
17. What documentation is MOST critical to maintain for safety compliance in the Aruba Certified Mobility Associate field? → Incident reports, training records, and inspection logs
18. Which Aruba product line is purpose-built for branch office deployments, combining switching, routing, and wireless in one device? → Aruba 9000 Series Gateway
19. Why is network access control (NAC) important in wireless networking? → To enforce security policies and prevent unauthorized access to the network
20. When deploying APs in an outdoor environment, what is the main RF design consideration compared to indoor deployments? → Fresnel zone clearance and longer propagation distances must be considered
21. Which Aruba Central feature uses machine learning to proactively identify network anomalies and provide troubleshooting recommendations? → AI Insights
22. Which Aruba solution provides centralized management, monitoring, and reporting for controller-based and controller-less WLAN deployments? → Central
23. What is the primary purpose of syslog in network management? → To collect and store event and diagnostic log messages from devices
24. In ACMA practice, what is the purpose of vulnerability scanning? → To identify weaknesses before attackers do
25. Which Aruba controller CLI command displays the current wireless client associations on access points? → show ap association
26. Which approach is recommended for troubleshooting controller architecture issues? → Use systematic isolation and testing methods
27. In Aruba infrastructure, what is 'ADP' (Aruba Discovery Protocol) used for? → Allowing APs to discover Mobility Controllers on the same Layer 2 segment
28. In Aruba's ARM feature, what happens when an AP detects high interference on its current channel? → ARM automatically switches the AP to a less congested channel
29. What is the best practice for maintaining controller architecture performance over time? → Implement scheduled preventive maintenance
30. In Aruba's architecture, an AP group is used to: → Apply a common set of virtual AP profiles and RF settings to multiple APs