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| Section | Objectives |
|---|---|
| Operations and Optimization | - Lifecycle Management - Monitoring and Troubleshooting |
| Designing HPE Aruba Networking Data Center Solutions | - Security and Segmentation
- Data Center Network Architecture Design
|
| Implementation and Deployment Planning | - Solution Validation
|
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43. Frage
You are recommending HPE Aruba Networking Central to a customer. Which customer requirement can be met only with an AAS license rather than an AAE license?
Antwort: B
Begründung:
When selecting management software subscriptions within the HPE Aruba Networking portfolio, the architect must evaluate the operational mechanics between Aruba Central as-a-Service (AAS) and Aruba Central Advanced/Foundation Electronic (AAE) licensing tiers.
A critical licensing differentiator involves co-termination and lifecycle management of staged subscription procurements. Aruba Central AAS subscriptions are delivered via the flexible HPE GreenLake edge-to-cloud platform framework, supporting programmatic co-terming of licenses. If a customer expands their deployment in phases-purchasing an initial block of switch licenses today and subsequent blocks months later-AAS enables alignment so that all subscription entitlements share a synchronized expiration date, avoiding subscription fragmentation.
In contrast, AAE licenses operate as fixed, static-duration electronic subscription keys that begin running down immediately upon point-of-sale processing or manual activation without native automated co- termination across disparate purchasing intervals. Both licensing models support 1-year, 3-year, and 5-year terms, as well as AI Insights telemetry.
Reference Topics: HPE Central Architecture and Software Licensing - AAS Flexible Subscriptions vs. AAE Static Electronic Licenses, Subscription Management and Co-Termination.
44. Frage
You are upgrading a customer's legacy three-tier architecture to an L3 spine-and-leaf topology. The CX switches in the topology will supply the overlay. The customer data center uses six VRFs. The customer has requested service leaf switches that connect to two clustered firewalls, which route and filter traffic between the VRFs.
How should the service leaf switches be connected to the firewalls?
Antwort: B
Begründung:
Connecting an external active/passive or active/active firewall cluster to a pair of ArubaOS-CX Service Leaf switches across multiple isolated tenant routing domains requires balancing physical link resiliency with multi- VRF segmentation.
To eliminate single points of physical failure and avoid spanning-tree blocked ports, the two Service Leaf switches should be configured as a Virtual Switching Extension (VSX) pair. Resilient connectivity to the firewall cluster is established using two multi-chassis Link Aggregation Groups (VSX LAGs)-one dedicated VSX LAG terminating on Firewall 1 and a second dedicated VSX LAG terminating on Firewall 2.
Because the customer data center utilizes six discrete VRFs that require dedicated inspection and inter-VRF routing by the firewalls, Layer 3 Routed-Only Ports (ROPs) cannot be used directly, as a physical ROP binds to only a single VRF instance. Instead, each VSX LAG must be configured as an IEEE 802.1Q trunk carrying one designated transit VLAN per VRF. Within each VRF, an SVI is created on the switches to peer with the corresponding sub-interface or VLAN interface on the firewall cluster, maintaining clean end-to-end traffic separation across all six routing domains.
Reference Topics: HPE Data Center Architecture - Connecting Service Leaves to Firewall Clusters; Multi- VRF Handoffs via VSX LAGs and 802.1Q Trunks.
45. Frage
You are proposing a new data center fabric to a customer whose applications rely heavily on IP multicast for market data distribution. Which control-plane protocol should you plan to support in the underlay or overlay design?
Antwort: A
Begründung:
Multicast-heavy environments require a multicast routing protocol such as PIM in the underlay, and if using an EVPN VXLAN overlay, EVPN's multicast/IGMP proxy extensions should be considered to efficiently replicate multicast traffic. STP, HSRP, and LLDP do not address multicast forwarding.
46. Frage
You have designed a two-tier L2 data center network for a customer. While presenting the solution, the customer states that they have a mission-critical multicast application with sources and receivers in the data center.
Which CX feature, in addition to features supplied by the PIM-SM standard, should you explain to emphasize the value of your solution?
Antwort: B
Begründung:
In classical Protocol Independent Multicast - Sparse Mode (PIM-SM) deployments, a single router on a shared multi-access segment is elected as the Designated Router (DR) based on priority or highest IP address.
Under standard PIM-SM, only this active DR joins the multicast shared distribution tree and forwards multicast traffic onto the segment, while the non-DR remains idle. In high-availability environments, if the active DR fails, multicast forwarding halts until neighbor hold timers expire, a new DR is elected, and new PIM Join messages build the distribution tree.
To overcome this failover penalty in mission-critical environments, ArubaOS-CX introduces PIM-SM Active- Active with Virtual Switching Extension (VSX). When configured across a VSX core/aggregation pair, both peer switches synchronize IGMP snooping tables, multicast routes, and outgoing interface lists (OIL) across the VSX Inter-Switch Link (ISL).
One VSX node operates as the active Designated Router, while the peer operates as a proxy Designated Router with its forwarding state fully staged in hardware. Should the active DR encounter an uplink failure or chassis outage, the peer proxy DR assumes active stream forwarding instantaneously, minimizing packet loss and preserving application delivery for mission-critical video, financial telemetry, or medical imaging feeds.
Reference Topics: HPE ArubaOS-CX High Availability - VSX Multicast Enhancements; PIM-SM Active- Active Synchronization and Sub-Second Recovery.
47. Frage
In a multi-fabric design, what is the minimum recommended MTU?
Antwort: C
Begründung:
In modern EVPN-VXLAN multi-fabric and Data Center Interconnect (DCI) architectures, encapsulating Ethernet frames across routed underlay boundaries introduces protocol overhead that demands systematic Maximum Transmission Unit (MTU) engineering.
VXLAN encapsulation adds a 50-byte (or 54-byte with dot1q) outer header, consisting of the Outer Ethernet Frame, Outer IP header, UDP header, and the 8-byte VXLAN Network Identifier (VNI) header. Furthermore, multi-fabric architectures frequently traverse Border Gateways (BGWs) or intermediate transport networks that may append additional label stacks or encapsulation headers (such as MPLS, EVPN Type-5 route metadata, or MACsec encryption trailers).
To completely prevent packet fragmentation-which severely degrades ASIC packet processing rates, increases CPU interrupts, and breaks path MTU discovery for overlay endpoints-the physical underlay transport infrastructure must support full jumbo frames. HPE Aruba Networking ' s best-practice standard for multi-fabric data center underlays explicitly specifies configuring a system-wide underlay MTU of 9198 bytes. This ensures that standard 9000-byte tenant jumbo payloads, hypervisor vMotion frames, and storage iSCSI packets pass across multiple encapsulated fabric boundaries without truncation or fragmentation overhead.
Reference Topics: HPE Data Center Network Design - EVPN-VXLAN Underlay Engineering; Jumbo Frame Sizing and 9198 MTU Configuration Standards.
48. Frage
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