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HPE Campus Access Switching Expert Written Exam Sample Questions (Q11-Q16):

NEW QUESTION # 11
You are configuring VSX active gateway on CX 8360 campus aggregation switches when the switch prompt returns the following error: "No more than IB VMACs can be configured." What should be done to address this issue?

A. Change the aggregation switch to a higher-end model, such as a CX 8400.
B. Limit the number of SVIs with active-gatewayto 16.
C. Change the switch profile to ''Leal'' to increase the number of supported vMACs.
D. As MAC addresses are link-local, use the same VMAC across SVIs.

Answer: D

Explanation:
The error "No more than 16 vMACs can be configured" occurs when trying to configure active-gateway on multiple SVIs on a CX 8360 VSX pair. This indicates a platform limit on the number of unique virtual MAC addresses has been reached.
* Active Gateway vMACs:Each SVI configured with Active Gateway requires a virtual MAC address (vMAC). While AOS-CX can auto-generate these, doing so consumes entries from a limited hardware pool (e.g., 16 on this platform/version).
* Best Practice & Solution:The recommended best practice to conserve these limited vMAC resources is to manually specify andreuse the same virtual MAC addressacross all SVIs configured with Active Gateway on that specific VSX pair. Since MAC addresses are Layer 2 local, using the same vMAC on different SVIs (different L3 subnets) does not cause conflicts within the VSX pair's operation.
* Analysis of Options:
* A: Limiting the number of SVIs using Active Gateway is a workaround, not a solution.
* B: Changing switch profiles doesn't typically alter hardware vMAC limits.
* C: Changing to a higher-end switch model might increase limits but is not the first or standard solution.
* D: Reusing the same VMAC across SVIs (active-gateway ip <vip> mac <SAME_VMAC>) avoids consuming a new vMAC entry for each SVI, thus staying within the platform limit. This is the standard, recommended solution.
* Conclusion:The correct approach to address the vMAC limit error is to explicitly configure the same virtual MAC address for all SVIs using the Active Gateway feature on the VSX pair.
References:AOS-CX VSX Guide (Active Gateway Configuration, Best Practices, vMAC considerations).
This relates to "Network Resiliency and virtualization" (8%) and "Routing" (16%).

NEW QUESTION # 12
Acme is having BGP issues with its AOS-CX switch and has asked you to helptroubleshoot the issue You have access to the CLI ofthe switch. Which command can you use to begin troubleshooting?

A. snow buffer | debug
B. show debug start
C. show debug destinations
D. show run | route destination!

Answer: C

Explanation:
The question involves troubleshooting BGP issues on an AOS-CX switch, and the task is to identify the appropriate CLI command to begin the troubleshooting process.
* Analysis of Options:
* Option A (show run | route destination):Incorrect syntax; the show running-config command with a filter is not specific to BGP troubleshooting.
* Option B (show debug start):Incorrect; AOS-CX does not use show debug start for initiating debugging.
* Option C (show buffer | debug):Incorrect; this is not a valid AOS-CX command for BGP troubleshooting.
* Option D:Correct. The show debug destinations command displays the current debug settings, including whether BGP debugging is enabled, which is a critical first step in troubleshooting BGP issues.
* Why Option D is Correct:To troubleshoot BGP issues, the first step is to verify if debugging is enabled for BGP events, as this provides detailed logs of session states, messages, and errors. The show debug destinations command on AOS-CX switches shows which debug types (e.g., BGP) are active and where logs are sent (e.g., console, syslog). If BGP debugging is not enabled, the administrator can enable it using debug bgp to capture relevant information, making this the ideal starting point for BGP troubleshooting.
* Relevance to Certification Objectives:
* Troubleshooting (10%):Involves performing advanced troubleshooting of routing protocols like BGP.
* Routing (16%):Includes diagnosing BGP session and configuration issues.
References:
HPE Aruba Networking AOS-CX Configuration Guide: Debugging and Logging, detailing debug commands.
HPE7-A06Study Guide: Covers BGP troubleshooting workflows.
HPE Aruba Networking Technical Documentation: AOS-CX CLI Reference, explaining show debug destinations.

NEW QUESTION # 13
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 B
B. Option C
C. Option D
D. Option A

Answer: A

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 # 14
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. Active gateway IP will be used as IGMP querier.
B. Agg-1
C. Agg-2
D. both Agg-1 and Agg-2

Answer: B

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 # 15
Review the diagram and existing configuration of RouterA above. Which configuration changes are necessary to permit load balancing between RouterA and RouterB? (Selecttwo) Exhibit.

Answer: C,E

Explanation:
Analyze Topology and Existing Configuration:
* RouterA (AS 64500) peers with RouterB (AS 64512) using eBGP.
* Peering is configured between loopback interfaces (RouterA Lo0 10.3.0.3 to RouterB Lo0 10.255.0.12).
* Two parallel physical links connect the routers (10.255.102.0/30 and 10.255.102.4/30).
* RouterA has two static routes pointing to RouterB's loopback (10.255.0.12/32), one via each physical link's next hop (10.255.102.1 and 10.255.102.5). This provides reachability to the BGP peer address over both paths.
* RouterA's BGP config activates the neighbor 10.255.0.12 for IPv4 unicast but is missing key commands for stable loopback peering and load balancing.
Goal:Permit load balancing for traffic exchanged via BGP between RouterA and RouterB. This requires BGP ECMP (Equal Cost Multi-Path).
Requirements for eBGP ECMP over Loopbacks:
* Stable Peering:Peering must use loopback addresses. This requires:
* update-source loopback <id>: To source BGP TCP packets from the loopback IP.
* ebgp-multihop <ttl>: Because loopbacks are not directly connected (TTL > 1 needed).
* ECMP Enabled:BGP must be configured to allow multiple paths in the routing table. This requires:
* maximum-paths <n> (or maximum-paths ebgp <n>): To allow more than the default 1 path.
* Equal Paths:BGP must see multiple paths to thesameprefix learnedfrom RouterBthat are considered equal based on BGP path selection attributes (Weight, Local_Pref, AS_Path, Origin, MED, etc.). Since routes are learned from the same neighbor IP (RouterB's loopback), these attributes will likely be identical for routes learned via this peering. RouterA already has equal static routestothe BGP next hop (10.255.0.12).

NEW QUESTION # 16
......

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