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HPE Campus Access Switching Expert Written Exam Sample Questions (Q49-Q54):

NEW QUESTION # 49
Exhibit.

After Implementing a distributed overlay with distributed anycast gateways, you noticed that toomany ARP packets are being replicated to every access (leaf) switch Which command can you use to optimize the network?

A. interface vlan 10 ip proxy-arp interface vlan 11 ip proxy-arp
B. vlan 10 arp-suppression vlan 11 arp-suppression
C. evpn ip proxy-arp
D. evpn arp-suppression

Answer: D

Explanation:
In an EVPN VXLAN distributed overlay network, excessive ARP packet replication (flooding) to all leaf switches is observed. We need the command to optimize this.
* EVPN ARP Optimization:EVPN uses its control plane (BGP) to distribute MAC and IP address reachability information. Leaf switches (VTEPs) learn these mappings. To reduce ARP flooding across the VXLAN fabric:
* ARP Suppression:VTEPs intercept ARP requests. If the VTEP already knows the MAC address for the requested IP (learned via EVPN), it can suppress the ARP request, preventing it from being flooded over VXLAN.
* Proxy ARP:VTEPs intercept ARP requests. If the VTEP knows the MAC for the requested IP, it can generate an ARP replyon behalfof the remote host.
* AOS-CX Commands:These features are configured within the EVPN context.
* evpn arp-suppression (B): Enables the ARP suppression feature for EVPN.
* evpn ip proxy-arp (C): Enables the proxy ARP feature for EVPN.
* Options A and D use standard interface/VLAN level arp-suppression or proxy-arp commands, which are not specific to optimizing flooding within the EVPN VXLAN fabric itself.
* Conclusion:To optimize by reducing the replication/flooding of ARP packets across the EVPN VXLAN overlay, enabling evpn arp-suppression (Option B) is the direct command. This leverages the EVPN control plane knowledge to stop unnecessary ARP flooding.
References:AOS-CX EVPN Configuration Guide (ARP Suppression, Proxy ARP features). This relates to
"Switching" (19%) and "Routing" (16%) objectives in the context of overlays.

NEW QUESTION # 50
Exhibit.

AGG-SW1 and AGG-SW2 are configured with iBGP and eBGP to AS65000. Both agg-sw1 and agg-sw2 useroute-map BGP-EXPORT and ip-prefix list local-export in the bgp configuration.
What must be done on agg-swl for the adjacent router to prefer to route all exported routes by agg-sw2?

A. Add set metric 200 to the route-map BGP-EXPORT.
B. Add set local-preference 200 to the route-map BGP-EXPORT
C. Add set as-path 65345 65345 65345 65345 to the route-map BGP-EXPORT Match with local-export ip prefix-list.
D. Add set as-path prepend 65345 65345 65345 65345 to the route-map BGP-EXPORT Match with local- export Ip prefix-list.

Answer: D

Explanation:
The goal is to make the adjacent router prefer routes exported by AGG-SW2 over AGG-SW1 for iBGP and eBGP routes to AS65000. Both switches use a route-map BGP-EXPORT with an ip-prefix list local-export.
BGP path selection uses attributes like local preference, AS path length, and metric to determine the preferred route.
* Analysis of Options:
* Option A:Setting local-preference 200 affects iBGP route selection within the same AS but has no impact on eBGP peers (external AS65000), as local preference is not advertised externally.
* Option B:Prepending the AS path with 65345 65345 65345 65345 increases the AS path length for routes exported by AGG-SW1, making them less preferred by the adjacent router (both iBGP and eBGP peers) compared to AGG-SW2's routes, which have a shorter AS path.
* Option C:Setting metric 200 affects the MED (Multi-Exit Discriminator), which is used for eBGP route selection within the same AS but is less influential than AS path length and not applicable for iBGP.
* Option D:Incorrect syntax (set as-path without prepend) and does not achieve the desired effect.
* Why Option B is Correct:BGP route selection prioritizes the shortest AS path for both iBGP and eBGP. By prepending AS 65345 multiple times to AGG-SW1's exported routes, AGG-SW1's routes appear less attractive due to a longer AS path, causing the adjacent router to prefer AGG-SW2's routes.
This is a standard BGP traffic engineering technique.
* Relevance to Certification Objectives:
* Routing (16%):Involves designing and troubleshooting BGP routing topologies, including manipulating path attributes like AS path.
* Troubleshooting (10%):Includes remediating BGP routing issues by adjusting route-maps.
References:
HPE Aruba Networking AOS-CX Configuration Guide: BGP Configuration, covering route-maps and AS path prepending.
HPE7-A06Study Guide: Details BGP path selection and traffic engineering.
HPE Aruba Networking Technical Documentation: BGP Route Manipulation, explaining AS path prepending for route preference.

NEW QUESTION # 51
Refer to the exhibit.

IGMP v3 was enabled on both VSX switches. Which switch becomes the IGMP querier forclients connected to Ace-1 switch?

A. both Agg-1 and Agg-2
B. Agg-2
C. Agg-1
D. Active gateway IP will be used as IGMP querier.

Answer: C

Explanation:
The setup has Agg-1 and Agg-2 as a VSX pair with IGMPv3 enabled. Ace-1 is a downstream switch connected to clients. The question asks which switch becomes the IGMP querier for clients connected to Ace-
1.
* IGMP Snooping & Querier:In a Layer 2 network using IGMP snooping, an IGMP querier is required on each VLAN to periodically send general queries. This prompts hosts to send membership reports, allowing snooping switches to learn which ports need which multicast streams.
* Querier Election:If multiple devices capable of querying exist on a VLAN (like routers or capable switches), an election occurs. Typically, the device with the lowest IP address on the VLAN becomes the querier.
* VSX & IGMP Querier:In an ArubaOS-CX VSX environment, the IGMP querier functionality is managed by the VSX pair. Documentation indicates that theprimary VSX switchtypically assumes the role of the IGMP querier for the VLANs it serves, including those extended via MC-LAG to downstream switches.
* Analysis of Options:
* A. Agg-2: Would only be the querier if it were the primary VSX switch.
* B. Both Agg-1 and Agg-2: Incorrect, only one active querier per VLAN is standard.
* C. Agg-1: Likely the primary VSX switch (often designated or wins election based on priority
/lower system MAC/IP) and thus becomes the querier.
* D. Active gateway IP: This is the virtual IP used for unicast routing, but the querier function runs on a physical switch, usually the primary.
* Conclusion:Assuming Agg-1 is the primary VSX switch (as is common convention or based on default election parameters if not explicitly configured), it will act as the IGMP querier for the VLAN serving clients connected to Ace-1.
References:AOS-CX Multicast Guide (IGMP Snooping, Querier Election), AOS-CX VSX Guide. This relates to "Switching" (19%) and "Network Resiliency and virtualization" (8%).

NEW QUESTION # 52
You are configuring an SSID thatisusing 802.IX as a security mechanism. Whatis the reason tor using WPA3- Ertorpnse (CCM-128) when deploying Wi-Fi 6 networks?

A. WPA3-Enterprise(CCM-128) is also called WPA3-Eniarpnse Compatibility Mode. It will allow WPA2 clients to connect.
B. WPA3-Entorprise(CCM-128) is also called WPA3-Entorpnso 192-bit mode. lt is WPA3 only and enforces specific EAP certificate ciphers.
C. WPA3-Enterprise(CCM-128) is also called WPA3-EnterpriseOnly Mode. There is no support tor WPA2 clients.
D. WPA3-Enterprise (CCM-128) is also called WPA3-Ente'prise Transition Mode. It will allow WPA2 clients to conned.

Answer: D

Explanation:
The question asks for the reason for using WPA3-Enterprise (CCM-128) when deploying Wi-Fi 6 networks.
* WPA3-Enterprise Modes:
* CCM-128:Uses AES-CCMP-128 (same cipher as WPA2). Its main purpose is to provide a transition path from WPA2 to WPA3. It allows both WPA3-capable and WPA2-only clients to connect to the same SSID. It enforces Protected Management Frames (PMF, 802.11w) when possible(required for WPA3, optional for WPA2). It's often called "Transition Mode" or
"Compatibility Mode".
* GCMP-256:Uses stronger AES-GCMP-256. It operates in "WPA3-Only Mode" and doesnot allow WPA2 clients.
* Wi-Fi 6 (802.11ax) & WPA3:Wi-Fi 6 certification requires support for WPA3.
* Analysis of Options:
* A: Incorrectly calls CCM-128 "192-bit mode" and "WPA3 only".
* B: Correctly calls CCM-128 "Transition Mode" and states it allows WPA2 clients.
* C: Correctly calls CCM-128 "Compatibility Mode" and states it allows WPA2 clients.
"Compatibility Mode" and "Transition Mode" are used interchangeably for this WPA3 mode.
* D: Incorrectly calls CCM-128 "Only Mode" and states no WPA2 support.
* Conclusion:Both Option B and Option C accurately describe WPA3-Enterprise (CCM-128). It is designed as a transition/compatibility mode to allow environments to adopt WPA3 features (like mandatory PMF for capable clients) while still supporting legacy WPA2 clients on the same network during the migration period. Selecting either B or C would be functionally correct based on common terminology.
References:Wi-Fi Alliance WPA3 specifications, Aruba WPA3 deployment guides, 802.11ax standard information. This relates to the "WLAN" (9%) and "Security" (10%) objectives.

NEW QUESTION # 53
A pair of CX 8325 series switches a configured in a VSX cluster. Which function is executed on both VSX members during normal operation?

A. periodically sends gratuitous ARP and broadcast hello packets
B. replies to ARP requests with thecluster vMAC
C. routes PIM and PIM-DR
D. relays DHCP requests or serves DHCP offer

Answer: B

Explanation:
The question asks which function is executed on both VSX members (CX 8325 switches) during normal operation in a VSX cluster.
* Analysis of Options:
* Option A:Correct. Both VSX switches reply to ARP requests with the cluster's virtual MAC (vMAC) for SVIs configured with active-gateway, ensuring consistent Layer 3 forwarding.
* Option B:Incorrect. PIM (Protocol Independent Multicast) and PIM-DR roles are typically handled by one switch, not both, in a VSX cluster.
* Option C:Incorrect. DHCP relay or server functions are not necessarily performed by both switches simultaneously.
* Option D:Incorrect. Gratuitous ARP and broadcast hello packets are typically sent by the primary switch or specific protocols, not both VSX members for all cases.
* Why Option A is Correct:In a VSX cluster, the active-gateway feature allows both switches to respond to ARP requests for Switched Virtual Interfaces (SVIs) using a shared virtual MAC address (vMAC). This ensures seamless Layer 3 forwarding and high availability, as clients receive consistent ARP replies regardless of which VSX switch processes the request. The vsx-sync feature ensures the vMAC is synchronized, enabling both switches to perform this function during normal operation, as per HPE Aruba Networking's VSX architecture.
* Relevance to Certification Objectives:
* Network Resiliency and Virtualization (8%):Designing and troubleshooting VSX for redundancy and active-active forwarding.
* Switching (19%):Implementing Layer 2/3 technologies, including ARP handling in VSX.
* Routing (16%):Ensuring consistent Layer 3 operations in VSX environments.
References:
HPE Aruba Networking AOS-CX Configuration Guide: VSX Configuration, detailing active-gateway and vMAC usage.
HPE7-A06Study Guide: Covers VSX Layer 3 functions and ARP handling.
HPE Aruba Networking Technical Documentation: VSX Active-Gateway Best Practices.

NEW QUESTION # 54
......

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