ACMA Controller Architecture 4 — Questions and Answers
Question 1: Which Aruba controller redundancy mechanism ensures active AP sessions are maintained during a controller failover?
- Hot standby with state synchronization (Correct answer)
- Cold standby reboot
- AP re-association only
- RADIUS re-authentication
Correct answer: Hot standby with state synchronization
Aruba controller clustering uses state synchronization to maintain active AP and client sessions during failover without requiring re-association.
Question 2: What is the maximum number of controllers that can form an Aruba controller cluster?
- 2
- 4 (Correct answer)
- 8
- 16
Correct answer: 4
An Aruba controller cluster supports up to 4 controllers sharing AP load and client state for redundancy and scalability.
Question 3: Which Aruba controller feature provides RF spectrum analysis to identify non-Wi-Fi interference sources?
- AirMatch
- Spectrum Analysis (Correct answer)
- ARM
- RFProtect
Correct answer: Spectrum Analysis
Spectrum Analysis on Aruba APs (with compatible hardware) identifies non-802.11 interference sources such as microwave ovens and Bluetooth devices.
Question 4: In Aruba's controller architecture, which table maps client MAC addresses to their associated AP and controller?
- Routing table
- User table (Correct answer)
- ARP cache
- VLAN table
Correct answer: User table
The controller's user table tracks each wireless client's MAC, IP, role, AP association, and authentication state.
Question 5: What is the role of the PEFNG (Policy Enforcement Firewall Next Generation) license in Aruba controllers?
- Enable CAPWAP tunneling
- Enable stateful user-based firewall and role-based access control (Correct answer)
- Enable spectrum analysis
- Enable mesh networking
Correct answer: Enable stateful user-based firewall and role-based access control
The PEFNG license unlocks stateful firewall policies, user roles, and application-layer inspection capabilities on the controller.
Question 6: Which Aruba controller CLI command displays the list of currently associated APs?
- show ap active (Correct answer)
- show wireless clients
- show ap database
- show interface wlan
Correct answer: show ap active
The 'show ap active' command lists all APs currently associated with the controller along with their status and AP group.
Question 7: In Aruba's architecture, an AP group is used to:
- Assign physical port configurations to controllers
- Apply a common set of virtual AP profiles and RF settings to multiple APs (Correct answer)
- Cluster controllers for redundancy
- Define VLAN pools for DHCP
Correct answer: Apply a common set of virtual AP profiles and RF settings to multiple APs
AP groups allow administrators to apply consistent virtual AP, RF, and system profiles to a collection of APs, simplifying large-scale management.
ACMA Controller Architecture 4
Which Aruba controller redundancy mechanism ensures active AP sessions are maintained during a controller failover?