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Exam Code: HPE6-A85
Exam Name: Aruba Certified Associate - Campus Access (ACA)
Exam type: Proctored
Exam duration: 1 hour 30 minutes
Exam length: 60 questions
Passing score: 67%
Delivery languages: English- Japanese- Latin American Spanish

- Network Stack (10%)

- OSI model layers (Physical- Data Link- Network- Transport- Session- Presentation- Application).
- TCP/IP stack fundamentals (e.g.- IP addressing- subnetting- ICMP).
- Encapsulation and de-encapsulation processes.
- Common protocols (e.g.- ARP- DHCP- DNS).

Terminologies:

- OSI Model: 7-layer reference model for network communication.
- TCP/IP Stack: Suite of protocols including IP (Internet Protocol)- TCP (Transmission Control Protocol)- UDP (User Datagram Protocol).
- Encapsulation: Wrapping data with headers/trailers at each OSI layer (e.g.- Ethernet frame at Layer 2).
- ARP (Address Resolution Protocol): Maps IP addresses to MAC addresses.
- DHCP (Dynamic Host Configuration Protocol): Automates IP address assignment.
- CIDR (Classless Inter-Domain Routing): Notation for subnet masks (e.g.- /24).

- Connectivity (8%)

- Ethernet cabling standards and PoE (Power over Ethernet).
- Wireless connectivity basics (SSID association- client roaming).
- IP addressing and subnetting for connectivity.
- Basic troubleshooting of connectivity issues.

- Terminologies:

- PoE (Power over Ethernet): Delivers power and data over Ethernet cables (e.g.- IEEE 802.3at for 30W).
- SSID (Service Set Identifier): Name of a wireless network for client association.
- Ethernet II Framing: Standard frame format with preamble- destination/source MAC- EtherType.
- Subnetting: Dividing networks into smaller subnetworks (e.g.- VLSM - Variable Length Subnet Masking).
- ClientMatch: Aruba technology for seamless client steering across APs based on RF conditions.
- RSSI (Received Signal Strength Indicator): Measures wireless signal strength in dBm.

- Network Resiliency and Virtualization (8%)

- Redundancy protocols (e.g.- VRRP- link aggregation).
- VLANs for traffic segmentation.
- Basic virtualization concepts (e.g.- VXLAN in campus).
- Failover and resiliency features in Aruba switches/APs.

Terminologies:

- VRRP (Virtual Router Redundancy Protocol): Provides gateway redundancy with a virtual IP.
- LACP (Link Aggregation Control Protocol): IEEE 802.3ad for bundling links (e.g.- LAG - Link Aggregation Group).
- VLAN (Virtual Local Area Network): IEEE 802.1Q tag for logical network segmentation.
- VXLAN (Virtual Extensible LAN): Encapsulates Layer 2 over Layer 3 for virtualized overlays.
- VSX (Virtual Switching Extension): Aruba AOS-CX feature for stacking switches with split-brain prevention.
- STP (Spanning Tree Protocol): Prevents loops (variants: RSTP - Rapid STP- MSTP - Multiple STP).

- Switching (15%)

- Port configuration (access- trunk- hybrid).
- VLAN assignment and inter-VLAN routing.
- MAC address learning and forwarding.
- Basic QoS and storm control.

Terminologies:

- AOS-CX: Aruba Operating System for CX switches (modular- intent-based).
- Trunk Port: Carries multiple VLANs with 802.1Q tagging.
- Access Port: Untagged single VLAN port for end devices.
- MAC Table (Forwarding Database): Switch table mapping MAC addresses to ports.
- Inter-VLAN Routing: Layer 3 switching using SVIs (Switched Virtual Interfaces).
- Storm Control: Limits broadcast/multicast traffic to prevent storms.

- WLAN (15%)

- RF concepts (channels- interference- power levels).
- AP modes (controller-based- Instant AP).
- SSID configuration and WPA3 security.
- Basic WLAN troubleshooting (e.g.- coverage- interference).

Terminologies:

- AP (Access Point): Device providing wireless coverage (e.g.- Aruba 500/600 series).
- RF (Radio Frequency): Wireless signal propagation (2.4 GHz- 5 GHz- 6 GHz bands).
- Channelization: Dividing spectrum into non-overlapping channels (e.g.- 20/40/80 MHz widths).
- WPA3 (Wi-Fi Protected Access 3): Latest security with SAE (Simultaneous Authentication of Equals) for enhanced protection.
- ARM (Adaptive Radio Management): Aruba feature for dynamic channel/power optimization.
- OFDMA (Orthogonal Frequency Division Multiple Access): Wi-Fi 6 technology for multi-user efficiency.

- Routing (12%)

- Static and dynamic routing (OSPF basics).
- Route advertisement and summarization.
- Default gateways and route metrics.
- Troubleshooting routing tables.

Terminologies:

- Static Route: Manually configured path (e.g.- ip route 0.0.0.0/0 ).
- OSPF (Open Shortest Path First): Link-state routing protocol (areas- LSAs - Link State Advertisements).
- Routing Table: FIB (Forwarding Information Base) for next-hop decisions.
- Administrative Distance: Trust metric for route selection (e.g.- 1 for connected- 110 for OSPF).
- Route Summarization: Aggregating routes (e.g.- 10.1.0.0/16 from /24 subnets).
- VRF (Virtual Routing and Forwarding): Isolates routing tables for segmentation.

- Security (10%)

- Firewall roles and policies.
- Threat detection (e.g.- ARP inspection).
- Basic encryption and access control.

Terminologies:

- User Role: Aruba policy defining access permissions (e.g.- employee- guest).
- Firewall Policy: ACLs (Access Control Lists) for traffic filtering (e.g.- session-based).
- DAI (Dynamic ARP Inspection): Validates ARP packets against DHCP snooping bindings.
- 802.1X Port Security: Port-based authentication for wired/wireless.
- ACL (Access Control List): Rules for permitting/denying traffic (standard/extended).
- Rogue AP Detection: Scanning for unauthorized APs.

- Authentication/Authorization (7%)

- 802.1X/EAP methods.
- MAC authentication and MPSK.
- Role derivation and enforcement.

Terminologies:

- ClearPass: Aruba NAC (Network Access Control) platform for policy enforcement.
- EAP (Extensible Authentication Protocol): Frameworks like EAP-TLS- PEAP-MSCHAPv2.
- MPSK (Multi-Pre-Shared Key): Unique PSKs per device on same SSID for headless IoT.
- RADIUS (Remote Authentication Dial-In User Service): AAA protocol for auth/authz.
- NAS (Network Access Server): Switch/AP acting as RADIUS client.
- Profiler: ClearPass tool for device profiling (e.g.- OS/fingerprint-based roles).

- Management and Monitoring (7%)

- Centralized management dashboards.
- Client and AP monitoring.
- UXI (User Experience Insight) for synthetic testing.

Terminologies:

- Aruba Central: Cloud-based management platform for APs- switches- gateways.
- UXI (User Experience Insight): Aruba tool for proactive monitoring via synthetic tests.
- SNMP (Simple Network Management Protocol): Polling for device stats (v2c/v3).
- Telemetry: Streaming data (e.g.- NetEdit for switch config validation).
- Dashboard Widgets: Visuals for KPIs like client count- uptime.
- API (Application Programming Interface): For integrating with external tools.

- Troubleshooting (4%)

- Diagnostic commands (show- debug).
- Log analysis and common failure modes.
- Layered troubleshooting (bottom-up OSI).

Terminologies:

- show Commands: AOS-CX CLI for status (e.g.- show interfaces- show log).
- Debugging: Real-time packet capture (e.g.- debug ip packet).
- Syslog: Centralized logging (severity levels: info- warning- error).
- Packet Tracer: Simulates traffic paths for fault isolation.
- Loopback Interface: Testing tool for Layer 3 connectivity.
- MTTR (Mean Time to Repair): Metric for resolution speed.

- Performance Optimization (3%)

- QoS policies for traffic prioritization.
- Bandwidth management.
- Basic load balancing.

Terminologies:

- QoS (Quality of Service): Prioritizes traffic (e.g.- DSCP - Differentiated Services Code Point).
- CoPP (Control Plane Policing): Protects CPU from DoS via rate limiting.
- WMM (Wi-Fi Multimedia): 802.11e for wireless QoS (voice/video queues).
- Bandwidth Contracts: Aruba role-based limits on throughput.
- AirMatch: Aruba RF optimization for AP placement/channel selection.
- Latency: Round-trip time (RTT) in ms for performance metrics.