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HPE Campus Access Switching Expert Written Exam Sample Questions (Q36-Q41):

NEW QUESTION # 36
The user's device is failing 802.1 Xwith EAP-TLS authentication. We know that theclient-side certificate is valid. What is the likely cause of this issue? (Select two.)

A. The user's device is using the wrong MAC address
B. There Is an EAP-type mismatch.
C. The NAD is not able to communicate with DNS servers.
D. The user's device is not configured to use the correct gateway.
E. There is a problem with the ACL applied to the switch port

Answer: B,C

Explanation:
The user's device fails 802.1X EAP-TLS authentication, but the client-side certificate is known to be valid.
We need two likely causes.
* EAP-TLS Process:Involves mutual certificate validation and TLS handshake between client and RADIUS server (proxied by NAD).
* Causes (Client Cert OK):
* Server Certificate Issues: Client doesn't trust server cert (Untrusted CA, name mismatch, expired).
* EAP Type Mismatch:Client supplicant configured for different EAP type than RADIUS server policy.
* RADIUS Server Issues:Policy misconfiguration, user not found, internal errors.
* NAD <-> RADIUS Communication Failure:Switch cannot reach RADIUS server (IP connectivity, firewall, routing), incorrect shared secret.
* Client Supplicant Misconfiguration:Incorrect identity, settings other than the certificate itself.
* Network packet loss.
* Analysis of Options (Select Two):
* A: Wrong gateway affects L3 post-authentication.
* B: ACL blocking EAPoL/RADIUS is possible but less common than config errors.
* C:EAP-type mismatch:A very common configuration error leading to failure.
* D: Wrong MAC address is irrelevant for EAP-TLS failure itself.
* E: NAD not able to communicate with DNS servers: DNS isn't directly involved in EAP-TLS.
However, if interpreted more broadly asNAD not able to communicate with the RADIUS server(due to IP routing, firewall, or incorrect server address), this is a very common cause of failure.
* Conclusion:An EAP-type mismatch (C) is a prime suspect when basic certificate validity is assumed.
Failure of the Network Access Device (NAD - the switch) to communicate with the RADIUS server (E, interpreted broadly as RADIUS reachability) is another major category of failure causes.
References:EAP-TLS (RFC 5216), 802.1X Troubleshooting Guides, ClearPass Documentation. This relates to "Troubleshooting" (10%), "Security" (10%), and "Authentication/Authorization" (9%).

NEW QUESTION # 37
Two CX 8325 switches are configured as a cluster using VSX for the coreroleand two CX 6300M in VSF for theaggregation role. When a minor software upgrade is issued on the switches, what isthe method to achieve a hitlessupgrade with the aggregation switches?

A. VSF update-software initiates thesoftware upgrade first on the primary switch. followed by the secondary.
B. VSF update-software initiates the software Upgrade first on the secondary switch, followed by the primary.
C. ISSU update-software initiates the upgrade first on thesecondary switch, Followed by theprimary.
D. ISSU update-software initiates the upgrade first on the primary switch, followed by the secondary.

Answer: B

Explanation:
The question involves a minor software upgrade on a VSF (Virtual Switching Framework) stack of CX
6300M switches in the aggregation role, with CX 8325 switches in a VSX cluster as the core. The task is to identify the method for a hitless upgrade on the aggregation switches.
* Analysis of Options:
* Option A:Correct. VSF upgrades start with the secondary switch, followed by the primary, to ensure continuous operation without traffic disruption.
* Option B:Incorrect. In-Service Software Upgrade (ISSU) is used for VSX, not VSF, and follows a different process.
* Option C:Incorrect. Upgrading the primary switch first in VSF risks disrupting control plane operations.
* Option D:Incorrect. ISSU is not applicable to VSF upgrades.
* Why Option A is Correct:In a VSF stack, the update-software command initiates a rolling upgrade, starting with the secondary (standby) switch to ensure the primary (commander) continues handling traffic. Once the secondary is upgraded and rejoins the stack, the primary is upgraded, maintaining hitless operation. This process leverages VSF's ability to keep member switches active during upgrades, minimizing downtime. The CX 6300M's VSF implementation supports this hitless upgrade mechanism, as per HPE Aruba Networking documentation.
* Relevance to Certification Objectives:
* Network Resiliency and Virtualization (8%):Designing and troubleshooting VSF for high availability and hitless upgrades.
* Troubleshooting (10%):Ensuring minimal disruption during software upgrades in campus networks.
References:
HPE Aruba Networking AOS-CX Configuration Guide: VSF Software Upgrade, detailing hitless upgrade procedures.
HPE7-A06Study Guide: Covers VSF maintenance and upgrade processes.
HPE Aruba Networking Technical Documentation: CX 6300 Series VSF Upgrade Best Practices.

NEW QUESTION # 38
Which command will permit read-only access to a user with physical access to an AOS-CS switch?

Answer: B

Explanation:
The question involves granting read-only access to a user with physical access to an AOS-CX switch. The task is to identify the correct command set.
* Analysis of Options (Assumed Context):Read-only access is typically configured using AAA with a privilege level or role. Option C is assumed to include commands like:
text
Copy
aaa authentication login privilege-mode
user operator password plaintext <password>
This assigns the "operator" role, which provides read-only access.
* Option A:Incorrect. Likely uses an incorrect role or privilege level (e.g., admin).
* Option B:Incorrect. May configure a role with excessive permissions or invalid syntax.
* Option C:Correct. Configures a user with the "operator" role for read-only access.
* Option D:Incorrect. Likely includes commands for a different access level or invalid configuration.
* Why Option C is Correct:In AOS-CX, the "operator" role provides read-only access, allowing users to view configurations and status (e.g., show commands) without modifying settings. The command user operator password plaintext <password> creates a local user with this role, and aaa authentication login privilege-mode ensures privilege levels are enforced upon login. This configuration is suitable for a user with physical access (e.g., via console or SSH), ensuring they cannot alter the switch, as per HPE Aruba Networking's AAA security practices.
* Relevance to Certification Objectives:
* Authentication/Authorization (9%):Configuring AAA for user access control.
* Security (10%):Implementing secure management access in customer networks.
* Troubleshooting (10%):Ensuring proper user permissions for network management.
References:
HPE Aruba Networking AOS-CX Configuration Guide: AAA Configuration, detailing user roles.
HPE7-A06Study Guide: Covers secure management access on AOS-CX switches.
HPE Aruba Networking Technical Documentation: AAA and User Role Best Practices.

NEW QUESTION # 39
Exhibit.

The customer has VSX clusters intwo locations interconnected over an MC-LAG interface.
If active-gateway configuration uses the same virtual IP address and vMAC on each of the VSX nodes, what must you take into consideration0

A. Transit traffic will Increase over the VSX interconnect MC-LAG.
B. The configuration would end up in an async setup.
C. Each ARP request will result in four responses.
D. Outbound traffic will be load-balancedover all VSX members for each session.

Answer: B

Explanation:
The scenario describes two separate VSX clusters interconnected via MC-LAG, where both clusters are configured to use theexact samevirtual IP address and virtual MAC address for their respective Active Gateway SVIs.
* Active Gateway Scope & Conflict:Active Gateway provides a highly available default gatewaywithina single VSX cluster (L2 domain). The vIP/vMAC combination should be unique within its L2 broadcast domain.
* Interconnecting Clusters with Same vIP/vMAC:When two VSX clusters using the identical Active Gateway vIP/vMAC are interconnected at Layer 2 (even via MC-LAG), this creates a situation where the same active L2 (vMAC) and L3 (vIP) address exists in multiple places within the extended broadcast domain.
* Consequences:This leads to MAC address conflicts and L3 ambiguity. ARP resolution becomes unreliable, potentially causing ARP tables to flap on connected devices. Traffic forwarding becomes unpredictable, as packets destined for the vIP/vMAC might be delivered to the "wrong" cluster. This unstable and unpredictable state is sometimes referred to as an asymmetric or "async" setup.
* Analysis of Options:
* A: ISL traffic might change, but it's a symptom, not the root problem.
* B: Multiple ARP replies would occur, contributing to the confusion.
* C: The configuration results in an "async setup," accurately describing the unstable state caused by duplicate active L2/L3 addresses across the interconnected L2 domain.
* D: Load-balancing happens within a cluster; this setup causes conflict, not predictable load balancing across clusters.
* Conclusion:Reusing the same Active Gateway vIP and vMAC across interconnected VSX clusters is not a valid design and leads to an unstable, asymmetric ("async") environment due to address duplication within the extended L2 domain. Option C best describes this problematic outcome.
References:Aruba VSX Design and Best Practices Guides (Active Gateway uniqueness, Interconnecting VSX clusters). This relates to "Network Resiliency and virtualization" (8%), "Routing" (16%), and
"Troubleshooting" (10%) objectives.

NEW QUESTION # 40
Refer to the exhibit.

A gateway cluster needs to be connected to the VSX-enabled switches where MC-LAG is configured What Is a possible constraint?

A. LLDP needs to be enabled to detect LACP-configured interfaces.
B. The command lacp fallback is missing on the interface lag level.
C. lacp mode active needs to be configured on the gateways when usingstatic-activate" mode.
D. LACP is not supported during the initial provisioning and needs to be turned off.

Answer: D

Explanation:
The question asks about a possible constraint when connecting an Aruba Gateway Cluster to upstream VSX switches using an MC-LAG.
* Scenario:Gateway Cluster acts as a single logical device forming an LACP LAG. The VSX switches are configured with MC-LAG, allowing the gateway cluster to bundle links across the two physical VSX switches.
* LACP & Initial Provisioning:LACP requires negotiation (exchange of LACP PDUs) between both ends of the link bundle to activate the LAG. During initial gateway provisioning (ZTP, OTP), the gateway might be in a minimal state without its full configuration, including LACP parameters. If the VSX switch ports are configured strictly for LACP active mode, the LAG might not form until the gateway is fully provisioned and running LACP. This lack of connectivity during provisioning is a constraint.
* Analysis of Options:
* A: lacp mode active is standard, but the issue is during provisioning, not runtime mode choice.
"static-activate" is unrelated.
* B: Theabsenceof lacp fallback could be the constraint. Fallback allows connectivity if LACP doesn't establish, which is useful during provisioning.
* C: LLDP is not required for LACP.
* D: Correctly identifies the constraint: Standard LACP required by the switch might not be supported or active on the gateway during its initial provisioning phase, potentially hindering the setup process. Workarounds like disabling LACP or enabling LACP fallback on the switch ports during this phase are often necessary.
* Conclusion:LACP incompatibility during the initial provisioning phase of the gateway cluster is a common constraint when connecting to switches requiring LACP for the LAG.
References:Aruba Gateway Installation Guides, AOS-CX MC-LAG Configuration Guide, LACP Standard (IEEE 802.3ad). This relates to "Connectivity" (9%) and "Network Resiliency and virtualization" (8%).

NEW QUESTION # 41
......

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