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HPE Campus Access Switching Expert Written Exam Sample Questions (Q35-Q40):

NEW QUESTION # 35
Match the AOS-CX switch BGP keepalive and holddown timersto the default.

Answer:

Explanation:

The question requires matching the default BGP keepalive and hold-down timers on AOS-CX switches to their respective values.
* Analysis of Options:
* Keepalive Timer:The keepalive timer determines how often BGP keepalive messages are sent to maintain a session. The default value on AOS-CX switches is 60 seconds.
* Hold-down Timer:The hold-down timer specifies the maximum time a BGP session can remain active without receiving a keepalive or updatemessage before it is considered down. The default value on AOS-CX switches is 180 seconds.
* Why This Mapping is Correct:Per BGP standards (RFC 4271) and HPE Aruba Networking AOS-CX documentation, the default BGP keepalive timer is 60 seconds, and the hold-down timer is 180 seconds (three times the keepalive interval). These timers ensure BGP sessions remain stable while allowing timely detection of peer failures. The AOS-CX implementation adheres to these defaults unless explicitly configured otherwise.
* Relevance to Certification Objectives:
* Routing (16%):Involves designing and troubleshooting BGP routing topologies, including timer configurations.
* Troubleshooting (10%):Includes diagnosing BGP session issues related to timers.
References:
HPE Aruba Networking AOS-CX Configuration Guide: BGP Configuration, detailing default timer values.
HPE7-A06Study Guide: Covers BGP session management and timers.
RFC 4271: A Border Gateway Protocol 4 (BGP-4), specifying default keepalive and hold-down timers.

NEW QUESTION # 36
A customer wants to deploy loT security devices that are PoE-powered. Dueto its criticality. it is required that those devices remain active even during a switch software upgrade. What is a valid solution to meet customer requirements?

A. power-over-ethernel priority
B. power-over-ethernet always-on
C. power-over-ether net quick-poe
D. a VSX pairof switches for redundancy

Answer: B

Explanation:
The question involves a customer deploying PoE-powered IoT security devices (e.g., door locks) that must remain active during an AOS-CX switch software upgrade. The task is to identify a valid solution.
* Analysis of Options:
* Option A:Incorrect. A VSX pair provides redundancy but does not guarantee PoE continuity during a single switch's upgrade.
* Option B:Incorrect. quick-poe reduces PoE startup time but does not ensure power during upgrades.
* Option C:Correct. power-over-ethernet always-on ensures PoE remains active during software upgrades, meeting the requirement.
* Option D:Incorrect. PoE priority adjusts power allocation but does not guarantee continuity during upgrades.
* Why Option C is Correct:The power-over-ethernet always-on feature on AOS-CX switches ensures that PoE power delivery continues uninterrupted during software upgrades or reboots, critical for devices like IoT security door locks that require constant power. This feature prevents power cycling on PoE ports, maintaining device operation. For example, enabling it on relevant ports (e.g., interface 1/1/1 power-over-ethernet always-on) ensures compliance with the customer's requirement, as per HPE Aruba Networking's PoE high-availability guidelines.
* Relevance to Certification Objectives:
* Connectivity (9%):Configuring PoE for critical device deployment.
* Network Resiliency and Virtualization (8%):Ensuring device uptime during maintenance.
* Troubleshooting (10%):Resolving PoE continuity issues.
References:
HPE Aruba Networking AOS-CX Configuration Guide: PoE Always-On Feature.
HPE7-A06Study Guide: Covers PoE configuration for high-availability devices.
HPE Aruba Networking Technical Documentation: PoE Best Practices for IoT.

NEW QUESTION # 37
A customer has configured eBGP peering using local AS 65000 with two routers from a CX 6300 VSF stack with thefollowing switch ports:
[ports connecting to router-1 10.10.10.2]

The LAGs are connected lo third-party L2 switches, which are used as a transit network for the remote eBGP routers. To optimise the possible BGP peering issues. The AOS-CX switch Is configured with theglobal settings:

What needs to be done on the AOS_CX switch to enable the bidirectional forwarding with the eBGP peers?

A. Option D
B. Option B
C. Option C
D. Option A

Answer: B

Explanation:
The goal is to enable Bidirectional Forwarding Detection (BFD) for eBGP neighbors 10.10.10.2 and
10.10.20.2 on the AOS-CX VSF stack (AS 65000). Global BFD settings are already configured. We need the specific commands to link BFD state to the BGP neighbor relationship.
* BFD for BGP Configuration:Requires enabling the fall-over bfd parameter for the specific neighbor within the router bgp <asn> configuration hierarchy.
* Analyzing the Options (New Image):
* Option 1 (Top):
router bgp 65000
address-family ipv4 unicast
neighbor 10.10.10.2 fall-over bfd
neighbor 10.10.20.2 fall-over bfd
This enables BFD specifically within the ipv4 unicast address family context for both neighbors. This is a valid configuration location.
* Option 2 (Second):
router bgp 65000
neighbor 10.10.10.2 fall-over bfd
neighbor 10.10.20.2 fall-over bfd
This enables BFD directly under the main neighbor <ip> configuration lines within router bgp 65000. This typically applies BFD to all address families configured for that neighbor relationship (including IPv4 unicast). This is also a valid and common configuration location.
* Option 3 (Third):
int 1/1/1-1/1/2, 2/1/1-2/1/2
fall-over-bfd
Incorrect. Applies BFD configuration under an interface range context, which is not how BFD is linked to BGP sessions.
* Option 4 (Bottom):
interface lag1-2
fall-over bfd
Incorrect. Applies BFD configuration under an interface LAG range context, which is not how BFD is linked to BGP sessions.
* Comparing Valid Options (1 vs 2):Both Option 1 and Option 2 correctly use the fall-over bfd command under router bgp. Option 1 provides per-address-family granularity, while Option 2 applies it to the neighbor generally. Without a specific requirement to enable BFDonlyfor IPv4, applying it at the neighbor level (Option 2) is often simpler and sufficient. Both achieve the goal for the required IPv4 peering. In many documentation examples, the configuration is shown at the neighbor level unless per- AF control is explicitly needed.
* Conclusion:Both Option 1 and Option 2 show valid configuration methods. Option 2 is arguably slightly more common/general when BFD is desired for the overall neighbor relationship.
References:AOS-CX BFD Guide, AOS-CX BGP Guide (neighbor commands, fall-over bfd option). This relates to "Routing" (16%) and "Network Resiliency and virtualization" (8%) objectives.

NEW QUESTION # 38
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: A

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 # 39
Exhibit.

Acme Corp has VM workload running from ToR-1. and has noticed performancedegradation They suspect ToK-1 uplinks are periodically overutilized. List valid reasons whyToR-1 uplinks 3re being overutilized based on the diagram. (Select two.)

A. The VLAN to instance mapping is not the same on all switches.
B. Thecustomer has used the default MSTP region configuration
C. Core-1 and Core-2 are not running the same firmware
D. Core-2 has been incorrectly configured as the root bridge
E. ToR-1uplinks and downlinks are both running spanning-tree port-type admin-network.

Answer: A,B

Explanation:
The question involves Acme Corp experiencing performance degradation due to overutilized uplinks from ToR-1 to Core-1 and Core-2, with a diagram (not provided) indicating a potential MSTP (Multiple Spanning Tree Protocol) issue. The task is to identify valid reasons for uplink overutilization.
* Analysis of Options:
* Option A:Incorrect. Incorrect root bridge configuration (e.g., Core-2 as root) may cause suboptimal paths but is not directly linked to uplink overutilization without further context.
* Option B:Correct. Inconsistent VLAN-to-instance mappings across switches can cause MSTP to block unexpected ports, funneling traffic through fewer uplinks and causing overutilization.
* Option C:Incorrect. Firmware mismatches may cause compatibility issues but are unlikely to directly cause uplink overutilization.
* Option D:Correct. Using the default MSTP region configuration (e.g., default region name and revision) across switches can lead to all switches forming a single MSTP region, potentially causing suboptimal topology and uplink overuse.
* Option E:Incorrect. Running MSTP with admin-network port-type on uplinks and downlinks is not a standard cause of overutilization; it's a specific port role.
* Why B and D are Correct:MSTP relies on consistent region configurations (region name, revision number, VLAN-to-instance mappings) to create efficient topologies. If VLAN-to-instance mappings differ (Option B), switches treat each other as separate regions, leading to blocked ports and traffic concentration on fewer uplinks, causing overutilization. Similarly, using the default MSTP region configuration (Option D) without customizing the region name or revision can result in all switches forming a single region with suboptimal spanning tree instances, potentially overloading specific uplinks. Both issues disrupt MSTP's ability to balance traffic across redundant paths, aligning with HPE Aruba Networking's MSTP troubleshooting scenarios.
* Relevance to Certification Objectives:
* Network Resiliency and Virtualization (8%):Troubleshooting MSTP for redundancy and fault tolerance.
* Switching (19%):Diagnosing Layer 2 issues, including MSTP misconfigurations.
* Performance Optimization (6%):Remediating uplink utilization issues.
References:
HPE Aruba Networking AOS-CX Configuration Guide: MSTP Configuration, detailing region and VLAN mapping.
HPE7-A06Study Guide: Covers MSTP troubleshooting and optimization.
HPE Aruba Networking Technical Documentation: MSTP Best Practices and Troubleshooting.

NEW QUESTION # 40
......

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