ACMA Controller Architecture 3 — Questions and Answers
Question 1: Which Aruba controller feature automatically optimizes channel and power settings for APs in the network?
- UCC
- AirMatch
- ARM (Correct answer)
- AirWave
Correct answer: ARM
ARM (Adaptive Radio Management) dynamically adjusts AP channel selection and transmit power to optimize coverage and minimize interference.
Question 2: What is a Virtual Mobility Controller (MC-VA) in Aruba's product line?
- A cloud-based AP management platform
- A software-based controller deployed on a hypervisor (Correct answer)
- A hardware chassis controller
- A redundant controller pair
Correct answer: A software-based controller deployed on a hypervisor
The MC-VA is Aruba's virtualized controller that runs as a VM on standard hypervisors such as VMware ESXi or KVM.
Question 3: In Aruba's Master-Local controller architecture (pre-Mobility Master), what is the primary function of the Master Controller?
- Terminate all user data traffic
- Distribute configuration and policies to Local Controllers (Correct answer)
- Act as a standalone AP
- Host the RADIUS database
Correct answer: Distribute configuration and policies to Local Controllers
The Master Controller in the legacy architecture distributes configuration and manages Local Controllers, similar to how Mobility Master functions in newer deployments.
Question 4: Which port does CAPWAP control traffic use by default?
- UDP 5246 (Correct answer)
- TCP 443
- UDP 5247
- TCP 8080
Correct answer: UDP 5246
CAPWAP control messages between APs and the controller use UDP port 5246 by default.
Question 5: What does CAPWAP data traffic (AP-to-controller tunneled user data) use by default?
- UDP 5246
- TCP 443
- UDP 5247 (Correct answer)
- GRE port 47
Correct answer: UDP 5247
CAPWAP data traffic is carried over UDP port 5247, separate from the control channel on UDP 5246.
Question 6: Which Aruba solution provides centralized management, monitoring, and reporting for controller-based and controller-less WLAN deployments?
- AirWave
- ClearPass
- Meridian
- Central (Correct answer)
Correct answer: Central
Aruba Central is the cloud-based network management platform supporting both controller-based and Instant AP deployments.
Question 7: In an Aruba controller cluster, what is the purpose of the cluster Virtual IP (VIP)?
- Provide a single IP for APs and clients to connect to regardless of which controller is active (Correct answer)
- Assign DHCP addresses to APs
- Terminate VPN tunnels from remote APs
- Host the captive portal page
Correct answer: Provide a single IP for APs and clients to connect to regardless of which controller is active
The cluster VIP provides a stable IP address that floats between controller cluster members, ensuring seamless failover for APs and clients.
ACMA Controller Architecture 3
Which Aruba controller feature automatically optimizes channel and power settings for APs in the network?