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Question 281

Which wireless feature allows an access point to communicate with multiple clients simultaneously using separate spatial streams?

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

Correct Answer: 1

Explanation

MU-MIMO, or Multi-User Multiple Input Multiple Output, allows a compatible access point to communicate with multiple clients simultaneously using multiple spatial streams. This can improve wireless efficiency in environments with several capable clients because the access point does not necessarily need to serve every client sequentially. The actual benefit depends on client capabilities, radio conditions, and traffic patterns. Target Wake Time focuses on scheduled client communication and power savings, BSS coloring helps distinguish overlapping BSS transmissions, and DHCP relay forwards DHCP traffic between subnets. Therefore, MU-MIMO is the appropriate technology for simultaneous multi-client spatial-stream communication.

Question 282

Which feature helps an IPv4 host automatically obtain an IP address, subnet mask, default gateway, and other network configuration from a server?

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

Correct Answer: 2

Explanation

Dynamic Host Configuration Protocol, or DHCP, allows hosts to automatically obtain network configuration information from a DHCP server. Depending on the configuration, the server can provide an IP address, subnet mask, default gateway, DNS server addresses, and other options. This reduces the need to manually configure each endpoint and helps maintain consistent network settings. ARP maps IPv4 addresses to MAC addresses, DNS resolves names, and LLDP provides information about directly connected network devices. Therefore, DHCP is the appropriate protocol for automatically providing IPv4 host configuration.

Question 283

An administrator wants to identify whether poor wireless performance is caused by excessive RF activity from other networks. Which information should be examined?

1. DHCP lease duration
2. MAC address aging
3. Channel utilization
4. Default gateway

Correct Answer: 3

Explanation

Channel utilization provides information about how much airtime on a wireless channel is occupied by detected activity. High utilization can indicate congestion from other wireless networks, clients, or other RF sources. Examining channel utilization can help administrators determine whether a busy channel is contributing to reduced wireless performance. DHCP lease duration controls how long an IP address remains assigned, MAC address aging affects Layer 2 forwarding entries, and the default gateway identifies the next-hop router for off-subnet traffic. Therefore, channel utilization is the relevant information for evaluating RF channel activity.

Question 284

Which protocol is commonly used to provide centralized authentication for administrators accessing network infrastructure?

1. DHCP
2. LLDP
3. TACACS+
4. NTP

Correct Answer: 3

Explanation

TACACS+ is commonly used for centralized authentication and authorization of administrators accessing network infrastructure. It can provide detailed authorization capabilities, allowing organizations to control which commands or administrative functions different users are permitted to perform. This is useful when network administrators have different responsibilities or privilege levels. DHCP provides host configuration, LLDP provides neighbor discovery information, and NTP synchronizes device clocks. Therefore, TACACS+ is the appropriate protocol for centralized administrative authentication and authorization on supported network devices.

Question 285

Which Aruba Central function can help administrators manage network devices from a centralized cloud-based platform?

1. Central management
2. ARP
3. STP
4. PoE

Correct Answer: 1

Explanation

Aruba Central provides centralized cloud-based management capabilities for supported Aruba network infrastructure. Administrators can use the platform to monitor devices, review health information, manage configurations, perform software management tasks, and troubleshoot connected clients. Centralized management is particularly useful when an organization operates multiple sites or distributed infrastructure because administrators can manage supported equipment from a common interface. ARP provides IPv4 address resolution, STP prevents Layer 2 loops, and PoE provides electrical power over Ethernet. Therefore, centralized Aruba Central management is the appropriate function for cloud-based infrastructure administration.

Question 286

Which Layer 2 protocol prevents switching loops by placing redundant paths into a blocked or alternate state?

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

Correct Answer: 3

Explanation

Spanning Tree Protocol, or STP, prevents Layer 2 switching loops by creating a loop-free logical topology. When redundant paths exist, STP can place selected interfaces into a non-forwarding state while maintaining them as potential backup paths. If an active path fails, the topology can adapt and another path may become available. RADIUS provides authentication, DHCP provides IP configuration, and SNMP provides monitoring and management information. Therefore, STP is the Layer 2 protocol responsible for preventing switching loops in networks containing redundant paths.

Question 287

Which wireless metric represents the strength of a received signal at the wireless receiver?

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

Correct Answer: 1

Explanation

RSSI, or Received Signal Strength Indicator, represents an indication of the strength of a wireless signal received by a client or access-point radio. Administrators commonly use RSSI when troubleshooting coverage, connectivity, and roaming issues. However, signal strength should be evaluated together with other RF measurements because a strong signal does not necessarily mean that the wireless environment is clean. SNR compares signal strength with noise, channel utilization measures airtime occupancy, and noise floor represents background RF energy. Therefore, RSSI is the metric specifically associated with received signal strength.

Question 288

Which Aruba wireless feature can help compatible clients move between access points more efficiently by reducing the time required for certain authentication procedures?

1. BSS coloring
2. 802.11r
3. TWT
4. MU-MIMO

Correct Answer: 2

Explanation

802.11r, commonly called Fast BSS Transition, is designed to support faster roaming between compatible access points. It can reduce the time involved in security-related procedures during a transition, which can be valuable for applications that are sensitive to interruptions, such as voice communications. Successful roaming also depends on client support, WLAN configuration, authentication infrastructure, and radio conditions. BSS coloring helps distinguish overlapping wireless networks, TWT supports scheduled wake periods, and MU-MIMO enables simultaneous spatial-stream communication. Therefore, 802.11r is the appropriate feature for improving roaming efficiency.

Question 289

Which switch feature allows an administrator to limit the number of MAC addresses that can be learned on an access interface?

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

Correct Answer: 3

Explanation

Port security can be used to limit the number of MAC addresses permitted or learned on a switch interface. This is useful for access ports where administrators expect a specific number of devices to connect. Depending on the configuration, the switch can learn permitted addresses dynamically or use statically defined addresses. If a violation occurs, the switch can take an action according to the configured security policy. LLDP provides neighbor information, QoS manages traffic treatment, and OSPF is a Layer 3 routing protocol. Therefore, port security is the appropriate feature for limiting MAC addresses on an access interface.

Question 290

Which protocol is used to resolve a hostname such as a server name into an IP address?

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

Correct Answer: 2

Explanation

Domain Name System, or DNS, translates human-readable hostnames into IP addresses and can also provide other name-related information. This allows users and applications to reference systems by names rather than remembering numerical IP addresses. DNS resolution is a fundamental service in most enterprise networks and is used by many applications before they establish network connections. NTP synchronizes clocks, ARP maps IPv4 addresses to MAC addresses, and RADIUS provides centralized authentication. Therefore, DNS is the appropriate protocol for resolving a hostname into its corresponding IP address.

Question 291

Which wireless security technology is designed to provide stronger enterprise security using modern WPA3 capabilities and centralized authentication?

1. WPA3-Enterprise
2. WPA2-Personal
3. WEP
4. Open authentication

Correct Answer: 1

Explanation

WPA3-Enterprise is designed for enterprise wireless deployments that require stronger security and centralized authentication. It works with enterprise authentication mechanisms such as 802.1X and commonly uses RADIUS infrastructure to validate users or devices. WPA2-Personal uses a shared pre-shared key, WEP is an obsolete security technology, and open authentication does not provide comparable wireless protection. WPA3-Enterprise can be deployed according to the security requirements of an organization and the capabilities of its clients and infrastructure. Therefore, WPA3-Enterprise is the appropriate technology for modern enterprise wireless security with centralized authentication.

Question 292

An administrator needs to identify which VLAN and switch interface are associated with a learned MAC address. Which information source is most useful?

1. DNS database
2. MAC address table
3. NTP server
4. DHCP relay

Correct Answer: 2

Explanation

The MAC address table maintained by a switch contains learned Layer 2 addresses and the interfaces through which those addresses were observed. Depending on the switch and configuration, the table also provides VLAN association information. Administrators can use this information to trace a connected endpoint and determine where its MAC address is currently learned. DNS stores name-resolution information, NTP provides time synchronization, and DHCP relay forwards DHCP traffic between subnets. Therefore, the MAC address table is the most useful source for identifying the VLAN and switch interface associated with a learned MAC address.

Question 293

Which feature allows an administrator to inspect packets by copying selected traffic from one or more switch interfaces to a monitoring interface?

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

Correct Answer: 3

Explanation

Port mirroring copies traffic from selected source interfaces or VLANs to a designated monitoring interface. A packet analyzer or security monitoring system connected to the destination interface can inspect the copied traffic for troubleshooting, performance analysis, or security investigation. The mirrored traffic does not normally replace the original forwarding process; it provides an additional copy for analysis. Port security restricts MAC addresses, DHCP snooping protects DHCP operations, and Root Guard protects the spanning-tree topology. Therefore, port mirroring is the appropriate feature for copying traffic to a monitoring system.

Question 294

Which protocol is used to exchange link-state routing information and calculate paths using a shortest-path algorithm?

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

Correct Answer: 1

Explanation

OSPF is a link-state interior gateway routing protocol. OSPF routers exchange information about network links and maintain a link-state database representing the topology within the relevant routing domain. They use the Shortest Path First algorithm to calculate suitable routes based on the available topology and configured metrics. SNMP is used for monitoring and management, DHCP provides host configuration, and LLDP provides information about directly connected neighbors. Therefore, OSPF is the protocol associated with link-state information exchange and shortest-path route calculation.

Question 295

Which wireless technology helps reduce the impact of overlapping Wi-Fi networks by allowing devices to identify transmissions belonging to different BSSs?

1. TWT
2. MU-MIMO
3. BSS coloring
4. 802.1X

Correct Answer: 3

Explanation

BSS coloring is a Wi-Fi 6 capability that helps wireless devices distinguish transmissions associated with different Basic Service Sets. This information can support more efficient spatial reuse in environments where multiple wireless networks operate on overlapping channels. By identifying the originating BSS, devices can make more informed decisions about transmissions from neighboring networks. TWT focuses on scheduled client wake periods, MU-MIMO enables simultaneous communication with multiple clients, and 802.1X provides network authentication. Therefore, BSS coloring is the appropriate technology for identifying transmissions from overlapping BSSs.

Question 296

Which feature protects a switch network by identifying trusted DHCP interfaces and blocking unauthorized DHCP server responses on untrusted ports?

1. DHCP snooping
2. IGMP snooping
3. LACP
4. SNMP

Correct Answer: 1

Explanation

DHCP snooping protects a Layer 2 network from unauthorized DHCP servers by distinguishing trusted and untrusted switch interfaces. Legitimate DHCP server responses are expected through trusted interfaces, while DHCP server messages arriving through untrusted interfaces can be blocked or handled according to the configured policy. This helps prevent rogue DHCP servers from providing incorrect gateway, DNS, or IP configuration information to clients. IGMP snooping manages multicast forwarding, LACP aggregates links, and SNMP provides network monitoring information. Therefore, DHCP snooping is the appropriate security feature for protecting DHCP operations.

Question 297

Which Aruba Central capability can help administrators determine whether managed devices are running approved software versions?

1. Client Insights
2. Firmware compliance
3. Site hierarchy
4. Port mirroring

Correct Answer: 2

Explanation

Firmware compliance provides visibility into whether managed network devices are operating with the required or approved firmware versions. Administrators can use this information to identify devices that may need upgrades and maintain software consistency across the infrastructure. Keeping supported firmware versions can also help organizations manage available features and updates. Client Insights focuses on endpoint information, site hierarchy organizes infrastructure according to locations, and port mirroring is used for traffic analysis. Therefore, firmware compliance is the appropriate Aruba Central capability for monitoring software-version compliance.

Question 298

Which protocol can provide centralized authentication and authorization information to network infrastructure when users connect to an enterprise wireless network?

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

Correct Answer: 1

Explanation

RADIUS is widely used to provide centralized authentication for enterprise wireless access. In an 802.1X deployment, the wireless infrastructure communicates with a RADIUS server to validate user credentials and obtain authorization information. This enables organizations to apply centralized access policies rather than relying on a single shared wireless password. LACP provides link aggregation, NTP synchronizes clocks, and OSPF exchanges routing information. Therefore, RADIUS is the appropriate protocol for centralized authentication and authorization in an enterprise wireless environment.

Question 299

Which feature can help reduce unnecessary multicast traffic by forwarding it only to switch interfaces with interested receivers?

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

Correct Answer: 1

Explanation

IGMP snooping allows a switch to monitor IGMP membership information and determine which ports have hosts interested in particular multicast groups. Based on that information, the switch can limit multicast forwarding to the interfaces that require the traffic. This reduces unnecessary multicast flooding and can improve network efficiency, especially in environments with multicast applications. Root Guard protects the spanning-tree root, BPDU Guard protects edge ports from unexpected BPDUs, and port security controls permitted MAC addresses. Therefore, IGMP snooping is the appropriate feature for optimizing multicast forwarding.

Question 300

Which Aruba wireless capability is intended to improve client distribution and roaming decisions by evaluating available access points and client conditions?

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

Correct Answer: 2

Explanation

ClientMatch is an Aruba wireless capability designed to improve client connectivity and roaming behavior by evaluating client conditions and available access-point resources. It can help address situations where a client remains connected to an access point or radio that may not provide the most suitable service. ClientMatch can support better client distribution and roaming decisions when compatible clients and infrastructure are properly configured. DHCP relay forwards DHCP requests, SNMP provides monitoring and management information, and STP prevents Layer 2 loops. Therefore, ClientMatch is the appropriate Aruba wireless capability for client distribution and roaming optimization.