ACMA Mobility Architecture & Infrastructure 4 — Questions and Answers
Question 1: What is the purpose of the Aruba 'AP provisioning' process when a new AP boots for the first time?
- Assign the AP a static IP address manually
- Allow the AP to discover and register with a Mobility Controller (Correct answer)
- Configure the AP's SSID list via USB
- Flash new firmware directly from the factory
Correct answer: Allow the AP to discover and register with a Mobility Controller
AP provisioning involves the AP discovering its controller via DHCP options, DNS, or ADP and then registering to receive its configuration.
Question 2: In Aruba infrastructure, what is 'ADP' (Aruba Discovery Protocol) used for?
- Detecting rogue APs on the network
- Allowing APs to discover Mobility Controllers on the same Layer 2 segment (Correct answer)
- Advertising available SSIDs to clients
- Synchronizing time between APs and controllers
Correct answer: Allowing APs to discover Mobility Controllers on the same Layer 2 segment
ADP is a Layer 2 multicast protocol that allows Aruba APs to discover controllers on the same broadcast domain during initial boot.
Question 3: Which forwarding mode sends all client traffic through the controller for policy enforcement before reaching the network?
- Bridged mode
- Distributed mode
- Tunnel mode (Correct answer)
- Mesh mode
Correct answer: Tunnel mode
Tunnel mode encapsulates all client traffic in GRE and sends it to the controller, ensuring centralized policy enforcement for all users.
Question 4: In Aruba's 'bridge mode' AP deployment, where is user traffic policy applied?
- At the Mobility Controller
- On the AP itself using locally configured policies (Correct answer)
- At the upstream firewall only
- By ClearPass after the fact
Correct answer: On the AP itself using locally configured policies
In bridge mode, APs apply firewall and policy rules locally and forward client traffic directly onto the local network without tunneling to the controller.
Question 5: What Aruba infrastructure feature enables multiple physical controllers to appear as a single logical controller to APs and clients?
- Redundancy pairs
- VSF (Virtual Switching Framework)
- Controller cluster (Correct answer)
- Master-Local hierarchy
Correct answer: Controller cluster
Aruba controller clusters present a unified control plane so APs and clients can roam freely without re-authenticating when moving between physical controllers.
Question 6: Which protocol does Aruba use to allow APs to advertise themselves and discover neighboring infrastructure devices?
- CDP (Cisco Discovery Protocol)
- LLDP (Link Layer Discovery Protocol) (Correct answer)
- STP (Spanning Tree Protocol)
- OSPF
Correct answer: LLDP (Link Layer Discovery Protocol)
Aruba APs support LLDP to communicate with neighboring switches and infrastructure devices for topology discovery and troubleshooting.
Question 7: In an Aruba Instant deployment (no controller), which AP takes on the role of managing the cluster?
- The AP with the highest MAC address
- The first AP powered on in the cluster
- The Virtual Controller (VC) elected dynamically (Correct answer)
- A designated master AP configured manually
Correct answer: The Virtual Controller (VC) elected dynamically
Aruba Instant APs elect a Virtual Controller dynamically; the VC manages configuration and policy for all APs in the cluster.
ACMA Mobility Architecture & Infrastructure 4
What is the purpose of the Aruba 'AP provisioning' process when a new AP boots for the first time?