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Question 381

Which wireless technology allows an access point to use multiple spatial streams to communicate with several compatible clients simultaneously?

1. TWT
2. OFDMA
3. BSS coloring
4. MU-MIMO

Correct Answer: 4

Explanation

MU-MIMO, or Multi-User Multiple Input Multiple Output, allows compatible wireless infrastructure to communicate with multiple clients using separate spatial streams. This can improve wireless efficiency when several clients require simultaneous data transmission. The actual benefit depends on client capabilities, access-point hardware, traffic patterns, and RF conditions. TWT is designed to coordinate client wake periods, OFDMA divides channel resources into smaller resource units, and BSS coloring helps distinguish transmissions from overlapping wireless networks. Therefore, MU-MIMO is the appropriate technology when multiple compatible clients need simultaneous spatial-stream communication.

Question 382

Which protocol is commonly used to provide secure remote command-line access to an Aruba network device?

1. Telnet
2. SSH
3. TFTP
4. SNMP

Correct Answer: 2

Explanation

SSH provides secure remote command-line access to network devices through an encrypted session. It protects administrative credentials and management traffic while allowing administrators to configure and troubleshoot supported Aruba infrastructure remotely. Telnet can also provide remote CLI access but does not provide the same level of encryption and security. TFTP is primarily used for basic file transfers, while SNMP is mainly used for network monitoring and management information. Therefore, SSH is the appropriate protocol for secure remote command-line administration of an Aruba network device.

Question 383

Which wireless measurement indicates the received strength of a wireless signal at a client or access point?

1. Channel utilization
2. Noise floor
3. RSSI
4. SNR

Correct Answer: 3

Explanation

RSSI, or Received Signal Strength Indicator, represents the strength of a received wireless signal. It is commonly used when evaluating wireless coverage and determining whether a client is receiving an adequate signal from an access point. RSSI alone does not describe the entire RF environment because noise and interference also affect wireless performance. Channel utilization indicates how busy a channel is, noise floor represents background RF energy, and SNR compares signal strength with noise. Therefore, RSSI is the appropriate measurement for received wireless signal strength.

Question 384

Which feature can prevent an unauthorized device from using an access switch port by limiting permitted source MAC addresses?

1. Port security
2. LLDP
3. OSPF
4. NTP

Correct Answer: 1

Explanation

Port security can restrict the source MAC addresses that are allowed to use a switch interface. An administrator can configure a maximum number of MAC addresses or specify permitted addresses depending on the platform and configuration. This can help prevent unauthorized endpoints from connecting through an access port. LLDP provides information about directly connected devices, OSPF is a dynamic routing protocol, and NTP synchronizes system clocks. Therefore, port security is the appropriate feature when the objective is to control which MAC addresses can use a switch port.

Question 385

Which protocol is used to synchronize the system clocks of network devices with a common time source?

1. NTP
2. DHCP
3. RADIUS
4. ARP

Correct Answer: 1

Explanation

NTP, or Network Time Protocol, synchronizes the clocks of network devices with a configured time source. Accurate and consistent time is important for troubleshooting, authentication, event correlation, security logging, and centralized monitoring. When switches, access points, gateways, and other systems use synchronized clocks, administrators can more accurately determine the sequence of network events. DHCP provides network configuration, RADIUS supports centralized authentication, and ARP resolves IPv4 addresses to MAC addresses. Therefore, NTP is the appropriate protocol for maintaining consistent system time across network infrastructure.

Question 386

Which wireless capability allows a client to remain in a low-power state until a scheduled communication period?

1. OFDMA
2. MU-MIMO
3. BSS coloring
4. Target Wake Time

Correct Answer: 4

Explanation

Target Wake Time, or TWT, allows compatible wireless clients and access points to coordinate specific periods when the client should wake and communicate. Outside those periods, a supported device can spend more time in a lower-power state. This can be especially useful for battery-powered devices and IoT deployments where reducing unnecessary radio activity is important. OFDMA improves resource allocation, MU-MIMO uses multiple spatial streams for simultaneous communication, and BSS coloring helps distinguish overlapping BSS transmissions. Therefore, TWT is the appropriate technology for scheduled wireless client wake periods.

Question 387

Which Aruba Central capability is designed to organize managed infrastructure according to physical locations such as branches or campuses?

1. Client Insights
2. Sites
3. Firmware compliance
4. Port mirroring

Correct Answer: 2

Explanation

Aruba Central Sites provide a logical way to organize network infrastructure according to physical deployment locations. Organizations can use sites to represent offices, branches, campuses, or other locations and associate relevant devices with them. This helps administrators view and manage infrastructure in a way that reflects the physical network deployment. Client Insights focuses on endpoint visibility, firmware compliance monitors software versions, and port mirroring copies traffic for analysis. Therefore, Sites are the appropriate Aruba Central capability for organizing managed infrastructure by physical location.

Question 388

Which feature protects an access-layer switch port when an unexpected spanning-tree BPDU is received?

1. Root Guard
2. Storm control
3. BPDU Guard
4. DHCP snooping

Correct Answer: 3

Explanation

BPDU Guard is commonly configured on edge or access interfaces where spanning-tree BPDUs are not expected. If an unexpected BPDU arrives on a protected port, the configured protective action can prevent the endpoint from affecting the spanning-tree topology. This helps protect the network from accidental or unauthorized connection of switching equipment to an edge interface. Root Guard protects the intended spanning-tree root, storm control limits excessive Layer 2 traffic, and DHCP snooping protects DHCP operations. Therefore, BPDU Guard is the appropriate feature for protecting an edge port from unexpected BPDUs.

Question 389

Which Aruba wireless technology can automatically optimize radio channel and transmit-power assignments based on RF conditions?

1. ClientMatch
2. RADIUS
3. AirMatch
4. SNMP

Correct Answer: 3

Explanation

AirMatch is an Aruba wireless RF optimization capability that evaluates the wireless environment and assists with radio-resource optimization. It can help determine appropriate channel and transmit-power assignments across access points while considering surrounding RF conditions. Automated RF optimization can be useful in environments where interference, neighboring networks, and client density change over time. ClientMatch focuses on client steering and distribution, RADIUS supports centralized authentication, and SNMP provides monitoring information. Therefore, AirMatch is the appropriate Aruba technology for automated RF channel and transmit-power optimization.

Question 390

Which IPv4 protocol resolves a local IP address to the corresponding MAC address?

1. ARP
2. DNS
3. DHCP
4. NTP

Correct Answer: 1

Explanation

ARP, or Address Resolution Protocol, is used by IPv4 hosts to discover the MAC address associated with a destination IPv4 address on the local network. When the mapping is not already available in the ARP cache, the host can send an ARP request to identify the device associated with the requested IPv4 address. DNS resolves hostnames to IP addresses, DHCP provides network configuration, and NTP synchronizes system clocks. Therefore, ARP is the appropriate protocol for resolving a local IPv4 address to a corresponding Layer 2 MAC address.

Question 391

Which Aruba Central feature provides visibility into endpoint characteristics and client behavior?

1. Sites
2. Firmware compliance
3. Client Insights
4. Configuration templates

Correct Answer: 3

Explanation

Client Insights provides visibility into connected endpoints and can help administrators understand client characteristics, connectivity information, and network behavior. This information can assist with troubleshooting and identifying endpoint-related issues across a managed environment. Sites are used to organize infrastructure by location, firmware compliance focuses on software versions, and configuration templates help standardize device settings. Therefore, Client Insights is the appropriate Aruba Central feature when administrators need detailed information about connected endpoints and their behavior.

Question 392

Which protocol is used to dynamically exchange link-state routing information within an enterprise network?

1. LACP
2. OSPF
3. LLDP
4. RADIUS

Correct Answer: 2

Explanation

OSPF, or Open Shortest Path First, is a link-state routing protocol commonly used within enterprise networks. OSPF routers exchange link-state information and build a topology database that allows them to calculate paths to network destinations. The protocol can dynamically adapt when network links or topology change. LACP is used for link aggregation, LLDP provides neighbor discovery information, and RADIUS provides centralized authentication. Therefore, OSPF is the appropriate protocol for dynamically exchanging link-state routing information within an enterprise network.

Question 393

Which feature can protect a network from an unauthorized DHCP server connected to an untrusted access port?

1. DHCP snooping
2. Root Guard
3. Port mirroring
4. IGMP snooping

Correct Answer: 1

Explanation

DHCP snooping helps protect a switched network by identifying trusted and untrusted interfaces for DHCP operations. DHCP server responses can be restricted so that legitimate replies are accepted only from trusted interfaces. This reduces the risk of an unauthorized DHCP server providing clients with incorrect IP addresses, gateways, or DNS information. Root Guard protects the spanning-tree root role, port mirroring copies traffic for analysis, and IGMP snooping manages multicast forwarding. Therefore, DHCP snooping is the appropriate security feature for preventing unauthorized DHCP server responses.

Question 394

Which wireless feature improves roaming by reducing the time required for a compatible client to complete the transition between access points?

1. 802.11k
2. 802.11v
3. 802.11r
4. OFDMA

Correct Answer: 3

Explanation

802.11r, commonly called Fast BSS Transition, is designed to reduce the time required for a compatible client to complete security-related operations when roaming between access points. Faster transitions can be beneficial for real-time applications such as voice and video because they can reduce interruptions during movement. 802.11k provides neighboring radio information, 802.11v provides wireless network management capabilities, and OFDMA improves channel resource allocation. Therefore, 802.11r is the appropriate wireless feature when the goal is to improve roaming transition speed.

Question 395

Which technology helps a switch forward multicast traffic only to interfaces with interested receivers?

1. STP
2. DHCP snooping
3. IGMP snooping
4. BPDU Guard

Correct Answer: 3

Explanation

IGMP snooping allows a Layer 2 switch to monitor IGMP messages exchanged by multicast receivers and routers. The switch can learn which interfaces have clients interested in particular multicast groups and then limit forwarding to those interfaces. This can reduce unnecessary multicast flooding and improve network efficiency. STP prevents Layer 2 loops, DHCP snooping protects DHCP operations, and BPDU Guard protects edge ports from unexpected spanning-tree BPDUs. Therefore, IGMP snooping is the appropriate technology for controlling multicast forwarding according to receiver membership.

Question 396

Which Aruba capability helps administrators apply consistent configuration settings across multiple supported devices?

1. Client Insights
2. Configuration templates
3. Channel utilization
4. RSSI

Correct Answer: 2

Explanation

Configuration templates allow administrators to define standardized settings that can be applied across supported network devices. This can reduce repetitive manual configuration and help maintain consistency across switches, gateways, or other managed infrastructure. Centralized templates are particularly useful when many devices require similar configuration parameters. Client Insights provides endpoint visibility, channel utilization measures wireless channel activity, and RSSI measures received signal strength. Therefore, configuration templates are the appropriate Aruba capability for applying consistent configuration settings across multiple devices.

Question 397

Which protocol provides centralized authentication for users connecting to an enterprise wireless network through 802.1X?

1. DHCP
2. SNMP
3. RADIUS
4. LLDP

Correct Answer: 3

Explanation

RADIUS is commonly used as the centralized authentication server protocol in enterprise wireless networks using 802.1X. The wireless infrastructure forwards authentication information from the client toward the RADIUS service, which validates the supplied credentials and can return authorization-related information. This allows organizations to manage wireless authentication centrally rather than relying on one shared password for every user. DHCP provides IP configuration, SNMP supports monitoring, and LLDP provides neighbor information. Therefore, RADIUS is the appropriate protocol for centralized 802.1X authentication in enterprise WLAN environments.

Question 398

Which wireless feature allows an access point to divide a channel into smaller resource units for multiple clients?

1. MU-MIMO
2. TWT
3. OFDMA
4. WPA3

Correct Answer: 3

Explanation

OFDMA, or Orthogonal Frequency Division Multiple Access, divides a wireless channel into smaller resource units that can be allocated to different clients. This allows an access point to schedule multiple transmissions more efficiently, particularly when many clients have smaller amounts of data to send or receive. MU-MIMO uses separate spatial streams, TWT coordinates scheduled client wake periods, and WPA3 provides wireless security. Therefore, OFDMA is the appropriate technology when the requirement is to divide channel resources into smaller units for multiple clients.

Question 399

Which protocol allows multiple Ethernet interfaces to operate together as a logical aggregated connection?

1. STP
2. RADIUS
3. LACP
4. DHCP

Correct Answer: 3

Explanation

LACP, or Link Aggregation Control Protocol, allows multiple physical Ethernet interfaces to participate in a logical link aggregation group. This can provide redundancy and increase the aggregate bandwidth available between compatible network devices. If one member link fails, other active member links can continue carrying traffic. STP provides loop prevention, RADIUS provides centralized authentication, and DHCP supplies network configuration information. Therefore, LACP is the appropriate protocol when multiple Ethernet interfaces need to operate together as one logical aggregated connection.

Question 400

Which wireless security option provides enterprise authentication using 802.1X rather than a shared personal password?

1. WPA3-Enterprise
2. WPA3-Personal
3. Enhanced Open
4. Open authentication

Correct Answer: 1

Explanation

WPA3-Enterprise is designed for enterprise wireless deployments that use 802.1X-based authentication. It can integrate with centralized authentication infrastructure such as a RADIUS server, allowing users or devices to authenticate individually rather than sharing one personal wireless password. WPA3-Personal uses SAE and a personal password, Enhanced Open provides encryption for open networks without requiring a shared password, and open authentication does not provide equivalent enterprise authentication. Therefore, WPA3-Enterprise is the appropriate wireless security option when 802.1X-based enterprise authentication is required.