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HPE Campus Access Switching Expert Written Exam Sample Questions (Q66-Q71):
NEW QUESTION # 66
Refer to the exhibit and cede sample.
What is the effect when you add thestatement "neighbor 10.2.0.3 send-community both" to the ipv4 address family? (Select two.)
Answer: B,E
Explanation:
The question asks for the effects of adding the command neighbor 10.2.0.3 send-community both to the BGP configuration under the IPv4 address family context for neighbor R2 (10.2.0.3) on router R1.
* send-community both:This command instructs R1 to send both standard (RFC 1997) and extended (RFC 4360) BGP community attributes to neighbor R2. By default, communities are not sent.
* BGP Capability Negotiation:Adding or changing features like community advertisement modifies the BGP capabilities exchanged between neighbors during session establishment. Any change to these capabilities requires the BGP session to be reset (flap) so that the peers can renegotiate using the new capabilities.
* Analysis of Options (Select Two):
* A: Correct (partially). It enables R1 tosendstandard and extended communities. The ability to receivedepends on the peer and local config. The capability isnegotiatedupon session reset.
* B: Incorrect. Changing capabilities requires the session to flap; it's not without consequence.
* C: Incorrect. It primarily enablesoutboundsending from R1. Inbound acceptance is implicit if the neighbor is activated.
* D: Correct. Modifying BGP neighbor capabilities, such as enabling send-community, necessitates a BGP session reset (flap) for the change to take effect.
* E: Incorrect terminology ("import/export", "type-1/type-2 communities").
* Conclusion:The command enables R1 to send communities (A describes the purpose/capability), and adding this command to an existing session will cause the session to flap for renegotiation (D describes the immediate consequence).
References:RFC 1997, RFC 4360, AOS-CX BGP Configuration Guide (communities, neighbor configuration). This relates to the "Routing" (16%) objective.
NEW QUESTION # 67
You are configuring an SSID that is using PSK as a security mechanism. Why should you use WPA3- Personal with WPA3 Transition Mode disabled?
Answer: A
NEW QUESTION # 68
Refer to the exhibit.
IGMP v3 was enabled on both VSX switches. Which switch becomes the IGMP querier forclients connected to Ace-1 switch?
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 # 69
When trying to add a now access switch to the network, theswitch port at the aggregation switch is automatically disabled.
What needs to be done to fix this issue?
Answer: C
Explanation:
The issue involves a new access switch's port being automatically disabled when connected to an aggregation switch, likely due to a Spanning Tree Protocol (STP) protection mechanism.
* Analysis of Options:
* Option A (Disable bpdu-filter):BPDU filtering prevents BPDUs from being sent or processed, which could cause loops, not resolve the issue.
* Option B (Disable root-guard):Root guard prevents a port from becoming the root bridge but does not cause port disablement in this context.
* Option C (Disable loop-guard):Loop guard prevents alternate ports from becoming designated but is unrelated to port disablement.
* Option D:Correct. Disabling BPDU guard on the aggregation switch's interface prevents it from disabling the port when it receives BPDUs from the new access switch.
* Why Option D is Correct:BPDU guard is an STP feature that disables a port if it receives BPDUs, assuming an unauthorized device is connected. When a new access switch isconnected, it sends BPDUs as part of normal STP operation, triggering BPDU guard on the aggregation switch and disabling the port. Disabling BPDU guard on the aggregation switch's interface (e.g., no spanning-tree bpdu-guard) allows the access switch to participate in STP without being disabled, resolving the issue while maintaining network stability.
* Relevance to Certification Objectives:
* Network Resiliency and Virtualization (8%):Involves troubleshooting STP mechanisms for fault tolerance.
* Troubleshooting (10%):Includes diagnosing and remediating STP-related issues in campus networks.
* Switching (19%):Covers Layer 2 technologies like STP and its protection features.
References:
HPE Aruba Networking AOS-CX Configuration Guide: Spanning Tree Configuration, detailing BPDU guard.
HPE7-A06Study Guide: Covers STP troubleshooting and protection mechanisms.
HPE Aruba Networking Technical Documentation: STP Best Practices, explaining BPDU guard behavior.
NEW QUESTION # 70
The customer is experiencing periodic uplink congestion between campus-1's AGG-1 and core. This has boon negativelyaffecting voice communications.The VOIP phones edge mark their packets with DSCP EF. The uplink from AGG-1 to core is LAG1.
The customer has already configured the following class and policy on AGG-1:
Based on this policy, which scrip), when deployed on AGG-1. will improve the reliable forwarding of voice trafficbetween AGG-1 and its uplink to the core?
Answer: D
Explanation:
The problem describes uplink congestion affecting VoIP traffic (marked with DSCP EF, value 46) on AGG-
1's LAG1 uplink. The existing configuration classifies this traffic into voip_class and applies voip_policy inbound, setting local-priority 6. To improve reliable forwarding during congestion, VoIP traffic needs strict priority queuing on the egress interface (LAG1).
* Analysis of Options:
* Option A applies a QoS schedule profile globally but doesn't modify the policy's local-priority or apply the schedule profile specifically to the congested LAG.
* Option B modifies voip_policy to set local-priority 7 (mapping DSCP 46 traffic to queue 7) and applies the 8qDwrStrict schedule profile to the egress interface lag 1. In the 8qDwrStrict profile, queue 7 is configured for strict priority, ensuring voice traffic gets precedence over lower-priority traffic during congestion. This aligns with best practices for QoS for VoIP.
* Option C also sets local-priority 7 and applies the schedule profile to lag 1, but the profile itself configures queue 7 with DWRR (Deficit Weighted Round Robin) instead of strict priority, which is less suitable for delay-sensitive voice traffic.
* Option D applies a schedule profile globally and uses DWRR for queue 7.
* Conclusion:Option B is the correct solution because it maps the DSCP EF traffic to the highest local priority (7) and applies a QoS schedule profile to the specific congested uplink (lag 1) that treats queue
7 with strict priority. This ensures voice traffic is prioritized reliably.
References:AOS-CX QoS Guide (specifically sections on Classification, Queuing, Scheduling Profiles, Strict Priority vs. DWRR, applying policies to interfaces/LAGs), DSCP to Queue mapping concepts. This relates to the "Performance Optimization" (6%) and "Connectivity" (9%) objectives.
NEW QUESTION # 71
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