Free HP HPE7-A08 Practice Exam with Questions & Answers | Set: 5

The key evidence is the Actor State for the local lag253(mc) interface. Its state is shown as:

ASFNCD

According to the AOS-CX show lacp interfaces state abbreviations, A means Active, S means Short-timeout , F means Aggregable, N means InSync, C means Collecting, and D means Distributing. Aruba Networks

The significant difference is the S (Short-timeout) state. Other local LAGs in the exhibit show ALFNCD, where L means Long-timeout . AOS-CX uses the slow LACP rate by default , which requests LACP heartbeat transmission every 30 seconds with a 90-second timeout. Configuring lacp rate fast changes this behavior to approximately one-second LACP heartbeats and a three-second timeout. Therefore, the S state on local lag253 demonstrates that this LAG has been explicitly configured away from the default behavior—hence it has a custom LACP rate configuration . Aruba Networks

Option B is not supported by the operational state. Although the partner displays an aggregator key of 0, lag253 is InSync, Collecting, and Distributing , and its forwarding state is up . Thus, the output does not indicate that a different partner aggregator key is required. lag27 likewise shows normal aggregation with both members using the same aggregation key.

Study Guide References: LACP State Flags; show lacp interfaces; LACP Fast/Slow Rate; Short and Long Timeout; VSX Multi-Chassis LAG.

Comprehensive Detailed Explanation:

To prevent man-in-the-middle attacks based on Layer 2 (Ethernet) addressing, enabling ARP inspection in the VLAN context is recommended. ARP inspection validates ARP packets and ensures only legitimate ARP responses are forwarded.

Enabling ARP inspection at VLAN level allows granular control.

Interface-level or global context is less typical or supported for ARP inspection on Aruba CX switches.

If the ISL between two VSX core switches is down and logs indicate that Core-2 has disabled its VSX LAG interfaces, it means Core-2 has disabled its VSX LAG interfaces, likely as a protective or failover mechanism.

Keepalive packets being dropped (Option B) may cause issues but logs specifically state interface disablement.

Both switches forwarding traffic (Option C) is unlikely if ISL is down.

Downstream switches inability to forward traffic (Option D) is a consequence, not the cause.

POST: Create a new object instance.

PUT: Modify a group of object properties.

PATCH: Modify object instance properties.

DELETE: Remove an object instance.

GET: Retrieve object instance properties.

AOS-CX is built with a REST-first architecture, where the Web UI and CLI both interact with the same internal database via an API. Understanding these standard HTTP methods is essential for network automation.

POST (Create): Used to create a new resource. For example, creating a new VLAN entry in the database.

GET (Read/Retrieve): Used to fetch information about a resource. It is a " read-only " operation used to check the status of a port or the contents of the routing table.

PUT (Replace/Modify Group): In the Aruba API context, PUT is used for a " complete update. " It essentially replaces the current object with a new set of properties. If you omit properties in a PUT request, they may return to default values.

PATCH (Partial Update/Modify Instance): PATCH is used for incremental changes. It allows you to modify only a specific subset of an object ' s properties (like changing only the description of a port) without having to resend the entire object configuration.

DELETE (Remove): Used to remove a specific resource instance from the switch database (e.g., deleting a VLAN or a static route).

The exhibit illustrates a high-availability design involving an AOS-CX 8325 VSX core pair and an AOS-CX 6300M VSF access stack. To determine the necessary change, we must evaluate the bandwidth relationship between the Inter-Switch Link (ISL) and the Access Uplinks.

VSX ISL Bandwidth Best Practice: A fundamental rule in Aruba VSX design is that the ISL (Inter-Switch Link) bandwidth should be equal to or greater than the bandwidth of the highest-speed uplink or the aggregate bandwidth of the downstream access connections. This ensures that in the event of a link failure (where traffic must traverse the ISL to reach its destination), the ISL does not become a bottleneck, causing packet loss or increased latency.

Analyzing the Current Topology:

The Access Uplinks from the CX 6300 stack to the CX 8325 core are utilizing 25GBase-SR (25 Gbps) connections.

The VSX ISL (ports 1/1/47 and 1/1/48 on the CX 8325s) is currently configured with 10GBase-SR (10 Gbps) optics.

This creates a " bottleneck " scenario where the core synchronization and failover path (10G) is significantly slower than the access path (25G).

Hardware Capabilities:

The AOS-CX 8325-48Y8C features 48 ports that support SFP/SFP+/SFP28 (1G/10G/25G).

Ports 1/1/47 and 1/1/48 are SFP28 capable. To adhere to best practices and match the 25G speed of the downstream 6300 uplinks, these ISL ports must be upgraded from 10G (SFP+) to 25G (SFP28).

Evaluating Other Options:

Option B is incorrect because the CX 8325 does not support SFP56 (50G) transceivers; SFP56 is typically found on the CX 6300/6400 series.

Option C is incorrect because the CX 6300M does not have QSFP28 (100G) ports; it uses SFP56 for its high-speed uplinks.

Option D is incorrect because the 6300 is already using 25G. While it could support SFP56, upgrading the access side to 50G while leaving the Core ISL at 10G would only exacerbate the bandwidth mismatch.

Therefore, the most critical architectural correction is upgrading the 8325 ISL ports to SFP28 to ensure the ISL bandwidth matches the 25G access uplinks.

AOS-CX switches include a robust Configuration Checkpoint system that allows administrators to save snapshots of the configuration state. These checkpoints are stored in the switch ' s internal flash memory.

Understanding the Exhibit: The output shows several checkpoints.

Lab2_final: A user-created checkpoint.

startup-config: The current configuration that will be loaded on reboot.

CPC2024...: Automatic " System " checkpoints created by the switch during various configuration events or at scheduled intervals.

The " Diff " Operation: To investigate a missing configuration (like the missing device profile) without impacting the operational state of the switch, you use the checkpoint diff command. This command compares two configuration files and displays the specific lines that are present in one but missing in the other (marked with + and -).

Analyzing the Requirement: The user wants to validate the removal without changing the current config.

Option B (Correct): Executing checkpoint diff startup-config CPC20240401183236_Access-1_6300 (or another older checkpoint) will show exactly what was removed. This is a read-only comparison.

Why other options are incorrect:

Option A: show checkpoint only lists the metadata (name, date, version); it does not provide a content comparison.

Option C: This command would overwrite an existing checkpoint or create a new one, but it does not provide an analytical comparison of the differences.

Option D: checkpoint rollback is a destructive operation; it immediately applies the older configuration to the running state, which violates the requirement to not change the current configuration.

When configuring a Multi-Chassis Link Aggregation Group (MC-LAG) in a VSX environment, the two physical switches must act as a single logical entity to the connected device (the Gateway).

The Concept of Multi-Chassis (Option A): In many networking architectures, including Aruba ' s legacy AOS-Switch and the conceptual models taught in certification, a LAG must be explicitly identified as " Multi-Chassis " to enable the coordination between the two physical switches. In AOS-CX, while you don ' t literally type " multi-chassis " on the interface, the term is used in exam contexts to describe the MC-LAG functionality.

The " One Link Up " Problem: If the Gateway only sees one link up, it means the LACP negotiation has failed on one of the two switches. This happens because the two switches are not presenting the same LACP System ID to the Gateway. Without the proper multi-chassis/VSX coordination, Switch 1 and Switch 2 appear as two completely different devices. The Gateway’s LACP process will see two different IDs for what it thinks should be one bundle and will block one of the links to prevent a loop.

Why not B? vsx-sync is used to synchronize the commands between the two switches so you don ' t have to type them twice. While helpful for management, its absence doesn ' t prevent a link from coming up as long as you manually configured both sides identically.

Why not C? lacp mode active on the switch will work perfectly with either active or passive on the Gateway side.

In a high-security " Colorless Ports " environment using AOS-CX, we often run both 802.1X (Dot1x) and MAC Authentication (MAC-auth) on the same port to handle a mix of corporate laptops and " dumb " IoT devices (printers, cameras).

The Default Behavior: By default, the switch usually attempts 802.1X first. When a device like a printer is plugged in, it does not have an 802.1X " supplicant " to respond to the switch ' s EAPOL-Request packets. The switch will wait for a series of timeouts and retries (EAPOL timeouts) before it gives up on 802.1X and moves on to the next method (MAC-auth). This waiting period is what causes the " few minutes " delay the user is experiencing.

Auth-Precedence vs. Auth-Priority:

Auth-Precedence: This defines the order in which the switch attempts the authentication methods.

Auth-Priority: This defines which method " wins " if multiple methods succeed (relevant for a PC that might trigger both).

The Solution: By changing the auth-precedence to mac-auth dot1x, the switch immediately captures the device ' s MAC address and sends it to the RADIUS server (like Aruba ClearPass) for authentication.

For a printer, MAC-auth succeeds immediately, and the port is authorized without waiting for 802.1X timeouts.

For a corporate laptop, MAC-auth happens first (granting basic or initial access), and then the 802.1X process can trigger immediately after to provide higher-level " User " access.

Why other options are incorrect:

Option A: Disabling 802.1X removes the security for corporate devices on those ports; it is not a " secure configuration " maintenance.

Option B: Increasing the timeout would make the delay worse, not better.

Option D: There is no specific " MAC auth start value " timer in AOS-CX that would solve a multi-minute delay caused by the 802.1X failure wait.

CLI Example:

Bash

interface 1/1/1

aaa authentication port-access auth-precedence mac-auth dot1x