In a multi-site deployment with a mix of bridged and tunneled SSIDs, if there are session sync errors

between different areas, it could be due to connectivity issues with the central management

platform, which in the case of Aruba, is likely HPE Aruba Networking Central. This interruption could

cause inconsistencies in session states across the network.

MU-MIMO (Multi-User, Multiple Input, Multiple Output) provides the most efficient use of airtime

for VoIP traffic among the options listed. MU-MIMO allows multiple users to receive multiple data

streams simultaneously, improving the overall efficiency of the network, especially in dense

environments where VoIP applications need consistent and reliable connectivity.

Applying the 'acmethreshold' profile as shown in the exhibit would set a minimum and maximum

threshold for queue 0, which affects the drop probability for traffic that exceeds these thresholds.

The yellow marking indicates a medium drop precedence, so yellow-flagged traffic would be more

likely to be dropped when congestion occurs, and the uplink is over-utilized. This action is intended

to protect higher-priority traffic, such as VoIP, by giving it a lower probability of being dropped.

UL MU-MIMO, or Uplink Multi-User Multiple Input Multiple Output, is a technology that allows

multiple clients to transmit data to the access point simultaneously, increasing overall throughput

and efficiency, especially for upload-heavy scenarios like video file uploads. This technology enables

spatially separated clients to access the channel at the same time, which can improve performance

for clients when uploading large files.

To ensure that ClearPass can initiate a Change of Authorization (CoA) consistently, it's important to

enable dynamic authorization to allow RADIUS CoA messages to be processed. This setting typically

falls under the high-availability cluster configuration to ensure that it persists across gateway

failovers. Additionally, the NAS IP address must be configured under RADIUS client settings to ensure

that the correct IP address is used for RADIUS communications, which is necessary for CoA to

function correctly.

The Modulation and Coding Scheme (MCS) used by wireless stations is directly affected by the signal-

to-noise ratio (SNR) and the frequency band. Higher SNR can lead to higher MCS values, which

means better data rates. The frequency band can affect MCS due to different channel characteristics,

such as the presence of interference and propagation properties, which are factors in determining

data rates.

Graceful Restart (GR) allows a router to continue forwarding packets while it restarts its OSPF

process. The GR helper role on AOS-CX switches supports routers during this process. OSPF routers

listen for Grace-LSAs to identify neighbors undergoing a graceful restart, maintaining adjacencies

with those routers to allow uninterrupted forwarding.

In the context of ArubaOS-CX, particularly with the 6300 series switches, setting the MTU on a routed

Link Aggregation Group (LAG) interface requires the interface lag id command in the configuration,

specifying the LAG interface you're configuring. The ip mtu command is then used to set the desired

MTU size for that LAG. Option A correctly shows this configuration process, where the MTU is set to

9198 for the LAG interface, in line with the requirements for routing larger frames, which could be

necessary for certain applications or data flows that require jumbo frames.

The information related to the configuration of Aruba switches is consistent with the principles and

guidelines found in the technical documentation for the ArubaOS-CX 6300 series switches, which

emphasizes the importance of correct MTU settings for network performance and stability.

When configuring Virtual Switching Extension (VSX) in a campus topology for link aggregation across

two aggregation switches, it is important to synchronize Multi-Chassis Link Aggregation Group (MC-

LAG) interfaces. The command "vsx-sync mclag-interfaces" ensures that the state and configuration

of MC-LAG interfaces are synchronized between the two VSX-linked switches, providing consistent

link aggregation and preventing any loops or mismatched configurations that might occur if the

interfaces were not in sync.

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The fallback role is used as a default role in the absence of a specified role or when an authentication

server is not available. Given the scenario, where the test device with MAC address

81:cd:93:13:ab:31 needs to be assigned to "iot-prod" and other devices to "iot-default", and

considering there is no external authentication server configured for the test, the appropriate action

would be to set a global fallback role that applies to all devices connecting to the network. This

ensures that any device that does not match the specific device profile will inherit the "iot-default"

role. Since the configuration for a specific MAC address (81:cd:93:xx:xx:xx) to associate with the "iot-

prod" role is already in place, setting the fallback role globally accommodates the requirement for

other devices.