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Question 321

Which wireless technology allows an access point to serve multiple compatible clients simultaneously using multiple spatial streams?

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

Correct Answer: 1

Explanation

MU-MIMO, or Multi-User Multiple Input Multiple Output, allows compatible wireless infrastructure to communicate with multiple clients simultaneously using separate spatial streams. This can improve efficiency when multiple clients support the required wireless capabilities. The benefit depends on the access point, client devices, traffic patterns, and RF conditions. TWT is designed for scheduled client wake periods, BSS coloring helps identify transmissions from different BSSs, and DHCP provides IP configuration. Therefore, MU-MIMO is the appropriate wireless technology when simultaneous communication with multiple compatible clients using spatial streams is required.

Question 322

Which Aruba Central feature provides a centralized view for managing the firmware versions of supported network devices?

1. Client Insights
2. Firmware management
3. Port mirroring
4. MAC learning

Correct Answer: 2

Explanation

Firmware management capabilities in Aruba Central allow administrators to monitor and manage software versions on supported network infrastructure. Centralized firmware visibility helps identify devices that require updates and makes it easier to maintain consistent software versions across a deployment. This is particularly useful when an organization operates multiple switches, access points, or gateways across different locations. Client Insights focuses on endpoint information, port mirroring copies network traffic for analysis, and MAC learning is a switching function. Therefore, firmware management is the appropriate capability for centralized firmware administration.

Question 323

Which IPv6 mechanism allows a host to learn the default router and network prefix from an IPv6 router?

1. ARP
2. DHCP snooping
3. Router Advertisement
4. LACP

Correct Answer: 3

Explanation

IPv6 Router Advertisements provide hosts with information about the local IPv6 network. An IPv6 router can advertise network prefixes, default router information, and other configuration-related flags. Hosts can use these advertisements as part of IPv6 neighbor discovery and Stateless Address Autoconfiguration. ARP is an IPv4 mechanism and is not used in the same way for IPv6, DHCP snooping protects DHCP operations, and LACP manages link aggregation. Therefore, Router Advertisement is the appropriate IPv6 mechanism for learning the local network prefix and default router information.

Question 324

Which feature can restrict the number or identity of MAC addresses permitted on a switch access port?

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

Correct Answer: 1

Explanation

Port security provides Layer 2 access control by allowing administrators to restrict which MAC addresses can use a switch interface. It can also limit the number of MAC addresses that are permitted or learned on an access port. This is useful when the expected devices connected to a port are known. OSPF provides dynamic routing, NTP synchronizes system clocks, and SNMP supports network monitoring and management. Therefore, port security is the appropriate feature when the administrator needs to restrict MAC addresses on a switch access interface.

Question 325

Which wireless metric indicates how much airtime on a channel is occupied by detected transmissions or activity?

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

Correct Answer: 4

Explanation

Channel utilization indicates the percentage or level of airtime occupied by activity detected on a wireless channel. High utilization can result from many clients, neighboring access points, or other sources of RF activity. Monitoring channel utilization can help administrators identify congested channels and investigate wireless performance issues. RSSI represents received signal strength, SNR compares the desired signal with noise, and noise floor represents background RF energy. Therefore, channel utilization is the appropriate metric for determining how busy a wireless channel is.

Question 326

Which protocol is commonly used to provide centralized authentication for users connecting to an enterprise WLAN?

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

Correct Answer: 1

Explanation

RADIUS is widely used as a centralized authentication service for enterprise wireless networks. In an 802.1X deployment, the access point or wireless controller forwards authentication information to the RADIUS server, which validates the credentials and can return authorization information. This allows organizations to manage user authentication centrally rather than using one shared wireless password. OSPF is a routing protocol, LACP provides link aggregation, and NTP synchronizes system clocks. Therefore, RADIUS is the appropriate protocol for centralized authentication in an enterprise WLAN.

Question 327

Which switch feature helps protect an edge port from an unexpected spanning-tree BPDU?

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

Correct Answer: 2

Explanation

BPDU Guard protects edge or access interfaces where spanning-tree BPDUs are not expected. If a BPDU is received on a protected port, the switch can take a protective action according to the configured behavior. This helps prevent an endpoint or unauthorized network device from influencing the spanning-tree topology. Root Guard is used to protect the intended STP root placement, DHCP snooping protects DHCP operations, and IGMP snooping controls multicast forwarding. Therefore, BPDU Guard is the appropriate feature for protecting an edge port from unexpected BPDUs.

Question 328

Which Aruba wireless capability can improve client roaming decisions by evaluating client conditions and available access points?

1. ClientMatch
2. DHCP relay
3. STP
4. SNMP

Correct Answer: 1

Explanation

ClientMatch is an Aruba wireless capability designed to improve client connectivity and roaming behavior. It can evaluate information about client conditions and available access points or radios and use that information to help improve client distribution. This can be useful when a client remains connected to an access point that may not provide the most suitable service. DHCP relay forwards DHCP requests between subnets, STP prevents Layer 2 loops, and SNMP provides monitoring information. Therefore, ClientMatch is the appropriate Aruba wireless capability for improving client roaming and distribution decisions.

Question 329

Which protocol provides secure file transfer between a network management system and an Aruba device?

1. TFTP
2. FTP
3. SCP
4. Telnet

Correct Answer: 3

Explanation

SCP, or Secure Copy Protocol, provides secure file transfer through an SSH-based encrypted connection. It can be used for transferring supported configuration files, software images, or other files between a management system and network devices. Because the communication is protected by SSH, SCP provides stronger security than traditional TFTP and other unencrypted transfer methods. TFTP provides basic file transfer without equivalent encryption, FTP is not inherently secure, and Telnet is an interactive remote-management protocol. Therefore, SCP is the appropriate protocol for secure file transfers to or from an Aruba device.

Question 330

Which Wi-Fi 6 capability helps distinguish transmissions from different overlapping Basic Service Sets?

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

Correct Answer: 4

Explanation

BSS coloring is a Wi-Fi 6 capability that helps wireless devices identify transmissions associated with different Basic Service Sets. This can improve spatial reuse in environments where several wireless networks operate on overlapping channels. By distinguishing the originating BSS, devices can make more informed decisions about how to handle transmissions from neighboring networks. OFDMA divides channel resources into smaller resource units, TWT supports scheduled client wake periods, and MU-MIMO enables simultaneous spatial-stream communication. Therefore, BSS coloring is the appropriate technology for distinguishing transmissions from overlapping BSSs.

Question 331

Which protocol is used to discover the MAC address associated with an IPv4 address on a local network?

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

Correct Answer: 2

Explanation

Address Resolution Protocol, or ARP, allows an IPv4 host to discover the MAC address associated with an IPv4 destination on the local network. If the MAC address is not already available in the host’s ARP cache, the host can send an ARP request asking which device owns the specified IPv4 address. DNS resolves hostnames, DHCP provides IP configuration, and NTP synchronizes clocks. Therefore, ARP is the appropriate protocol for mapping a local IPv4 address to its corresponding MAC address.

Question 332

Which Aruba Central capability helps administrators organize network devices according to their physical deployment locations?

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

Correct Answer: 3

Explanation

Aruba Central Sites provide logical organization based on physical deployment locations. Administrators can use sites to represent branches, offices, campuses, or other locations and associate relevant network infrastructure with them. This makes monitoring and operational management easier because devices can be viewed within their physical context. Client Insights provides endpoint visibility, firmware compliance focuses on software versions, and port mirroring copies traffic for analysis. Therefore, Sites are the appropriate Aruba Central capability for organizing infrastructure according to physical locations.

Question 333

Which protocol allows multiple Ethernet links to be aggregated into one logical connection?

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

Correct Answer: 1

Explanation

LACP, or Link Aggregation Control Protocol, allows multiple physical Ethernet links to participate in a logical link aggregation group. This can provide redundancy and increased aggregate bandwidth between supported network devices. LACP also helps dynamically establish and maintain the participating links. RADIUS is used for centralized authentication, LLDP provides neighbor information, and DHCP provides IP configuration. Therefore, LACP is the appropriate protocol when multiple physical Ethernet connections need to operate together as one logical link.

Question 334

Which feature can limit excessive broadcast, multicast, or unknown-unicast traffic on a switch interface?

1. LLDP
2. RADIUS
3. Storm control
4. OSPF

Correct Answer: 3

Explanation

Storm control is designed to limit excessive Layer 2 traffic such as broadcast, multicast, and unknown-unicast frames. Administrators can define thresholds that determine when protective action should occur. This can help prevent traffic storms from consuming excessive bandwidth and switch resources. LLDP provides information about directly connected devices, RADIUS supports centralized authentication, and OSPF provides dynamic routing. Therefore, storm control is the appropriate feature for protecting switch interfaces against excessive Layer 2 traffic.

Question 335

Which authentication method can be used for devices that cannot perform traditional 802.1X authentication?

1. MAC authentication
2. OSPF
3. NTP
4. LLDP

Correct Answer: 1

Explanation

MAC authentication can be used for devices that cannot perform traditional 802.1X authentication. Examples can include certain printers, IoT devices, specialized equipment, or other endpoints that lack an 802.1X supplicant. The device’s MAC address can be checked against an authentication or policy system, allowing the network to assign appropriate access according to the configured rules. OSPF is a routing protocol, NTP synchronizes time, and LLDP provides neighbor discovery. Therefore, MAC authentication is an appropriate option for devices that cannot perform standard 802.1X authentication.

Question 336

Which Aruba feature can automatically optimize wireless radio channels and power based on the surrounding RF environment?

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

Correct Answer: 2

Explanation

AirMatch is an Aruba wireless RF optimization capability that can evaluate the surrounding RF environment and assist with optimizing radio resources. It can help determine suitable channel assignments and transmit-power levels across access points. This type of automated optimization is useful in environments where RF conditions vary or where multiple access points operate near one another. SNMP provides monitoring and management information, RADIUS supports authentication, and DHCP provides IP configuration. Therefore, AirMatch is the appropriate Aruba feature for automated RF channel and transmit-power optimization.

Question 337

Which protocol can provide event notifications and monitoring information to a centralized network management system?

1. SNMP
2. SSH
3. ARP
4. OSPF

Correct Answer: 1

Explanation

SNMP is commonly used for monitoring and managing network infrastructure. A network management system can use SNMP to retrieve information about interfaces, system resources, counters, and other supported management objects. SNMP can also provide notifications such as traps or informs when configured events occur. SSH is primarily used for secure interactive management, ARP resolves local IPv4 addresses to MAC addresses, and OSPF exchanges routing information. Therefore, SNMP is the appropriate protocol for centralized monitoring and event notification from supported network devices.

Question 338

Which feature allows authenticated users to receive different network permissions according to their assigned role?

1. NTP
2. Role-based access control
3. Port mirroring
4. LLDP

Correct Answer: 2

Explanation

Role-based access control allows network administrators to apply different access policies based on the role assigned to an authenticated user or device. For example, employees, guests, contractors, and administrators can receive different permissions according to organizational requirements. This provides a structured way to manage access without creating completely separate policies for every individual user. NTP synchronizes time, port mirroring copies traffic for analysis, and LLDP provides neighbor information. Therefore, role-based access control is the appropriate mechanism for assigning different network permissions according to authenticated roles.

Question 339

Which protocol is used to synchronize the clocks of Aruba switches, access points, and other network devices?

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

Correct Answer: 3

Explanation

NTP, or Network Time Protocol, is used to synchronize the system clocks of network devices. Consistent time is important for troubleshooting, event correlation, security logging, authentication systems, and operational monitoring. When infrastructure devices use a common time source, administrators can compare logs from different devices more accurately and establish the sequence of network events. RADIUS provides centralized authentication, DHCP provides IP configuration, and SNMP supports monitoring and management. Therefore, NTP is the appropriate protocol for maintaining consistent time across Aruba network infrastructure.

Question 340

Which feature allows a switch to learn multicast group membership and forward multicast traffic only toward interested interfaces?

1. IGMP snooping
2. BPDU Guard
3. Root Guard
4. Port security

Correct Answer: 1

Explanation

IGMP snooping enables a Layer 2 switch to monitor IGMP messages and learn which interfaces have hosts interested in particular multicast groups. The switch can then limit multicast forwarding to the interfaces where interested receivers are present. This reduces unnecessary multicast flooding and can improve bandwidth efficiency in networks using multicast applications. BPDU Guard protects edge ports from unexpected spanning-tree BPDUs, Root Guard protects the intended STP root, and port security controls permitted source MAC addresses. Therefore, IGMP snooping is the appropriate feature for managing multicast forwarding based on receiver membership.