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| Section | Objectives |
|---|---|
| Multicast and Traffic Optimization | - IGMP snooping and multicast control - PIM-SM/SSM concepts (high-level) |
| Aruba AOS-CX Switching Technologies | - VLANs, trunking, and link aggregation (LACP) - VSX, VSF, and MC-LAG architecture - Spanning Tree (RSTP/MSTP) operations |
| Network Troubleshooting and Operations | - Performance optimization (MTU, QoS, congestion) - Switch diagnostics and CLI-based troubleshooting |
| Automation and Programmability | - NETCONF/YANG and Python-based automation (conceptual) - REST API and HTTPS interface usage |
| Routing and Multilayer Switching | - OSPF fundamentals and advanced operations - Inter-VLAN routing and L3 switching - BGP basics in campus environments |
| Campus Network Architecture | - Redundancy, high availability, and load balancing strategies - Scalable enterprise network topology design - Hierarchical campus design (core, distribution, access layers) |
| Security and Access Control | - Role-based access control and segmentation - 802.1X authentication and NAC integration (ClearPass) |
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60. Frage
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?
Antwort: B
Begründung:
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%).
61. Frage
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?
Antwort: B
Begründung:
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.
62. Frage
Following HPE Aruba Networking best practice, dick where you implement loop protection.
Antwort:
Begründung:
63. Frage
Network administrators are reporting that switches arc taking a very long time to execute commands. Based on the configuration below, what is the mostlikelycause ofthe issue?
Antwort: C
Begründung:
The issue is that switches are taking a very long time to execute commands. The question points towards the AAA configuration as the context (though the specific configuration is missing).
* AAA and Command Latency:When AAA servers (like TACACS+ or RADIUS) are used for authentication, authorization, or accounting, the switch must communicate with these servers.
* Impact of Unreachable Servers:If the primary AAA server configured on the switch becomes unreachable (due to network issues, server downtime, or firewall rules), the switch will attempt to connect, wait for a configured timeout period (often several seconds), and only then potentially try a secondary server or fall back to local credentials (if configured). This connection attempt and timeout period occurring before command execution (if command authorization is enabled) or during login introduces significant delays.
* Analysis of Options:
* A: Too many administrators might strain resources, but AAA timeouts cause more predictable, long delays per action.
* B: Authentication fail-through only comes into playafterthe primary server times out. The timeout itself causes the delay.
* C: An unreachable primary TACACS+ (or RADIUS) server is a classic cause of slow logins and command execution delays due to connection timeouts.
* D: A DoS attack might cause general slowness but isn't specifically linked to the AAA configuration context provided.
* Conclusion:The most likely cause, given the context of AAA configuration and the symptom of slow command execution, is that the primary configured AAA server (like TACACS+) is unreachable, causing the switch to wait for timeouts.
References:AOS-CX Security Guide (AAA, TACACS+, RADIUS), general network troubleshooting for AAA latency. This relates to "Authentication/Authorization" (9%) and "Troubleshooting" (10%) objectives.
64. Frage
You haverecently configured a switch for 802.IX authentication with HPE Aruba Networking ClearPass. A security admin is seeing events withthe following description in ClearPass Event Viewer.
RADIUS authentication attempt from unknown NAD (10.10.1.10:1812)'
Which command should you us to identify theconfiguration issue?
Antwort: B
Begründung:
The ClearPass Event Viewer message "RADIUS authentication attempt from unknown NAD (10.10.1.10:
1812)" indicates that ClearPass received a RADIUS request from the IP address 10.10.1.10, but this IP is not configured as a trusted Network Access Device (NAD) in ClearPass's network device list, or the shared secret doesn't match. The first step in troubleshooting on the switch side is to verify which source IP address the switch is actually using to send these RADIUS requests.
* RADIUS Source IP:AOS-CX switches can be configured to use a specific source IP address for RADIUS packets, often using the ip source-interface radius [vrf <vrf-name>] command. This is important if the switch has multiple IP interfaces or uses VRFs.
* Analysis of Commands:
* A. show ip source-interface radius: This command directly displays the configured source interface and IP address used for RADIUS communications, allowing comparison with the IP configured in ClearPass.
* B. show aaa authentication-server radius: Shows server group configuration, not the source IP used by the switch.
* C. show radius-server shared-secret: Not a standard command; secrets are usually masked in other commands.
* D. show radius-server detail: Shows configured RADIUS server details but doesn't explicitly show the source IP the switch is using to originate packets.
* Conclusion:To identify why ClearPass sees requests from an "unknown NAD" IP (10.10.1.10), the first step on the switch is to confirm which source IP it's using. show ip source-interface radius provides this crucial information.
References:AOS-CX Security Guide (RADIUS Client Configuration, ip source-interface), ClearPass Documentation (NAD Configuration). This relates to "Authentication/Authorization" (9%) and
"Troubleshooting" (10%) objectives.
65. Frage
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