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Question 261

Which wireless security method uses individual user authentication through an authentication server rather than a shared wireless password?

1. WPA2-Personal
2. Enhanced Open
3. Open authentication
4. WPA2-Enterprise

Correct Answer: 4

Explanation

WPA2-Enterprise uses an enterprise authentication framework, commonly based on 802.1X and a RADIUS authentication server. Instead of giving every user the same pre-shared key, individual users can authenticate using their own credentials. This provides stronger identity-based access control and makes it easier to revoke or change access for individual users. WPA2-Personal relies on a shared pre-shared key, Enhanced Open provides encryption without traditional authentication, and open authentication does not provide equivalent wireless security. Therefore, WPA2-Enterprise is the appropriate method when individual user authentication through a centralized authentication server is required.

Question 262

Which switch feature helps protect an edge port by shutting down or otherwise protecting it when an unexpected BPDU is received?

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

Correct Answer: 2

Explanation

BPDU Guard is designed to protect edge or access interfaces where spanning-tree BPDUs are not normally expected. If a BPDU is received on a protected interface, the switch can take a protective action according to its configuration. This prevents an unauthorized or incorrectly connected device from influencing the spanning-tree topology through that access port. Root Guard is used to protect the intended STP root placement, DHCP snooping protects DHCP operations, and storm control limits excessive Layer 2 traffic. Therefore, BPDU Guard is the appropriate feature for protecting an edge port from unexpected BPDUs.

Question 263

Which wireless metric describes the difference between the received signal strength and the surrounding RF noise?

1. SNR
2. RSSI
3. Channel utilization
4. Transmit power

Correct Answer: 1

Explanation

Signal-to-Noise Ratio, or SNR, describes the relationship between the desired wireless signal and the surrounding noise. A higher SNR generally means that the receiver can distinguish the intended signal more effectively from background RF energy. SNR is therefore useful when evaluating wireless quality and troubleshooting connectivity or performance issues. RSSI represents received signal strength, channel utilization measures how busy a channel is, and transmit power indicates the power level used by the transmitting radio. Therefore, SNR is the metric that directly describes the relationship between signal strength and noise.

Question 264

An administrator needs to combine several physical Ethernet interfaces into one logical link for redundancy and aggregate bandwidth. Which technology should be configured?

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

Correct Answer: 3

Explanation

LACP, or Link Aggregation Control Protocol, allows multiple physical Ethernet interfaces to operate together as a logical aggregated connection. This provides redundancy because traffic can continue through remaining links if one physical connection fails. It can also provide increased aggregate bandwidth when traffic is distributed across multiple member links. STP is used to prevent Layer 2 loops, OSPF provides dynamic routing, and DHCP provides IP configuration. Therefore, LACP is the appropriate technology when multiple Ethernet interfaces need to be combined into one logical connection.

Question 265

Which Aruba wireless capability can help optimize radio resources by dynamically selecting suitable channels and transmit-power levels?

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

Correct Answer: 2

Explanation

AirMatch is an Aruba wireless RF optimization capability that helps manage radio resources across an environment. It can evaluate RF conditions and assist with decisions such as channel assignments and transmit-power levels. This is particularly useful in deployments with many access points where neighboring radios can affect one another. RADIUS provides centralized authentication, SNMP supports monitoring and management, and DHCP relay forwards DHCP requests between network segments. Therefore, AirMatch is the appropriate Aruba wireless capability for dynamically optimizing radio resources according to the RF environment.

Question 266

Which IPv4 protocol is used to discover the MAC address corresponding to a local IPv4 destination?

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

Correct Answer: 4

Explanation

Address Resolution Protocol, or ARP, is used by IPv4 hosts to discover the Layer 2 MAC address associated with an IPv4 address on the local network. When a host needs to communicate with a local destination and does not have the corresponding MAC address in its ARP cache, it can send an ARP request. DNS resolves hostnames to IP addresses, DHCP provides network configuration, and ICMP supports control and diagnostic messaging. Therefore, ARP is the appropriate protocol for discovering the MAC address associated with a local IPv4 destination.

Question 267

Which Aruba Central feature provides administrators with information about connected endpoints and can assist with identifying client-related issues?

1. Client Insights
2. Site hierarchy
3. Firmware compliance
4. Device inventory

Correct Answer: 1

Explanation

Client Insights provides enhanced visibility into connected clients and endpoint characteristics. This information can assist administrators in understanding client behavior and identifying issues that may affect connectivity or network performance. Endpoint-focused visibility is especially useful in large environments where many different client types and operating systems may be connected. Site hierarchy organizes infrastructure according to locations, firmware compliance focuses on software versions, and device inventory provides general information about managed devices. Therefore, Client Insights is the Aruba Central capability most directly associated with client-focused visibility and troubleshooting.

Question 268

An administrator wants to securely copy a software image from a management workstation to an Aruba switch. Which protocol is appropriate?

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

Correct Answer: 2

Explanation

SCP, or Secure Copy Protocol, provides encrypted file transfer through an SSH-based connection. It is suitable for securely transferring supported software images, configuration files, or other files between a management workstation and a network device. Because the transfer uses SSH security, SCP provides stronger protection than traditional unencrypted file-transfer methods. TFTP is simple but does not provide comparable encryption, FTP does not inherently provide the same secure transport, and Telnet is an interactive management protocol. Therefore, SCP is the appropriate choice for securely transferring a software image to an Aruba switch.

Question 269

Which wireless feature allows a compatible client to negotiate scheduled periods for waking and communicating with an access point?

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

Correct Answer: 3

Explanation

Target Wake Time, or TWT, allows compatible wireless clients and access points to establish scheduled periods during which the client wakes and communicates. This can reduce unnecessary radio activity and help conserve battery power. TWT is particularly useful for compatible devices that can benefit from predictable communication schedules. BSS coloring helps distinguish transmissions from different BSSs, MU-MIMO enables simultaneous communication using multiple spatial streams, and channel bonding combines adjacent channel resources. Therefore, Target Wake Time is the appropriate feature for scheduled client wake and communication periods.

Question 270

Which feature can provide separate network access policies by assigning authenticated users to different roles?

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

Correct Answer: 1

Explanation

Role-based access control allows network policies to be associated with the role assigned to an authenticated user or device. Different roles can receive different permissions, VLAN assignments, security policies, or access restrictions according to the network design. This approach can simplify policy management because administrators can define access requirements by role rather than manually configuring every individual user. Port mirroring is used for traffic analysis, LLDP provides neighbor information, and NTP synchronizes clocks. Therefore, role-based access control is the appropriate feature for applying different network access policies according to user roles.

Question 271

Which protocol is commonly used to synchronize the clocks of network switches, routers, and other infrastructure devices?

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

Correct Answer: 2

Explanation

Network Time Protocol, or NTP, is used to synchronize system clocks across network devices and other systems. Accurate and consistent time is important for troubleshooting, event correlation, security logging, authentication systems, and other operational tasks. When multiple devices use a common time source, administrators can more easily compare log entries and determine the sequence of events. SNMP is primarily used for monitoring, RADIUS provides centralized authentication, and DHCP provides host network configuration. Therefore, NTP is the appropriate protocol for maintaining consistent time across network infrastructure.

Question 272

An administrator wants to prevent excessive broadcast and multicast traffic from consuming too much bandwidth on a switch interface. Which feature should be configured?

1. Port security
2. Root Guard
3. Storm control
4. LLDP

Correct Answer: 3

Explanation

Storm control helps protect a switched network from excessive broadcast, multicast, and unknown-unicast traffic. Administrators can configure thresholds that define how much of a particular traffic type is acceptable on an interface. When traffic exceeds the configured threshold, the switch can take protective action according to its implementation. Port security controls permitted source MAC addresses, Root Guard protects the spanning-tree root topology, and LLDP provides neighbor information. Therefore, storm control is the appropriate feature when the goal is to prevent excessive Layer 2 traffic from consuming network resources.

Question 273

Which protocol is commonly used for centralized authentication of users connecting to enterprise wireless networks?

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

Correct Answer: 1

Explanation

RADIUS is commonly used as a centralized authentication service for enterprise wireless networks. In an 802.1X deployment, the wireless infrastructure forwards authentication information to the RADIUS server, which validates the user’s credentials and can return authorization information. This approach allows organizations to manage authentication centrally rather than distributing a shared wireless password to every user. OSPF is a routing protocol, LACP provides link aggregation, and NTP synchronizes clocks. Therefore, RADIUS is the appropriate protocol for centralized enterprise wireless authentication.

Question 274

Which Aruba Central capability can help administrators determine whether managed devices are running the required firmware versions?

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

Correct Answer: 2

Explanation

Firmware compliance capabilities help administrators determine whether managed network devices are running versions that meet the organization’s defined requirements. Maintaining appropriate firmware versions can support operational consistency and access to supported features and updates. A centralized compliance view can also help administrators identify devices that require an upgrade. Client Insights focuses on endpoints, site labels organize or identify infrastructure locations, and port mirroring copies traffic for analysis. Therefore, firmware compliance is the appropriate capability for checking whether managed devices meet required firmware-version standards.

Question 275

Which switch feature allows administrators to copy traffic from selected interfaces to another interface for packet analysis?

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

Correct Answer: 4

Explanation

Port mirroring allows a switch to copy selected traffic to a designated monitoring interface. A network analyzer, packet capture system, or security monitoring appliance can then inspect the copied traffic without being directly placed in the original traffic path. Administrators commonly use port mirroring for troubleshooting, performance analysis, and security investigations. DHCP snooping protects DHCP operations, Root Guard protects spanning-tree root placement, and port security restricts source MAC addresses. Therefore, port mirroring is the appropriate feature for sending copies of selected traffic to a monitoring device.

Question 276

Which Aruba Central organizational element can be used to associate infrastructure with a particular physical location?

1. Site
2. Client role
3. MAC table
4. VLAN ID

Correct Answer: 1

Explanation

A Site in Aruba Central represents a logical location used to organize network infrastructure according to physical deployment areas. Organizations can use sites for branches, offices, campuses, or other locations where network equipment is installed. This makes it easier to view and manage devices according to their physical context. A client role defines access characteristics, a MAC table contains Layer 2 forwarding information, and a VLAN ID identifies a logical Layer 2 segment. Therefore, Site is the appropriate Aruba Central organizational element for associating infrastructure with a physical location.

Question 277

An administrator wants to prevent unauthorized devices from connecting to a switch access port by limiting permitted MAC addresses. Which feature should be used?

1. IGMP snooping
2. Port security
3. NTP
4. OSPF

Correct Answer: 2

Explanation

Port security can restrict the MAC addresses permitted on a switch interface. It is commonly applied to access ports where administrators know which devices should be connected. Depending on the platform and configuration, MAC addresses may be statically assigned or dynamically learned, and violations can trigger protective actions. IGMP snooping manages multicast forwarding, NTP synchronizes system clocks, and OSPF exchanges routing information. Therefore, port security is the appropriate feature for restricting unauthorized devices from using a switch access port.

Question 278

Which protocol allows a network management system to receive event notifications from supported network devices?

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

Correct Answer: 2

Explanation

SNMP supports network monitoring and can provide event notifications through mechanisms such as traps and informs. A network management system can receive these notifications when configured devices detect specified conditions or events. SNMP can also be used to retrieve management information such as interface statistics and system status. SSH is primarily used for secure interactive management, DHCP provides IP configuration, and ARP resolves IPv4 addresses to MAC addresses. Therefore, SNMP is the appropriate protocol when a management system needs to receive network-device event notifications.

Question 279

Which routing protocol uses a link-state database and calculates paths using the Shortest Path First algorithm?

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

Correct Answer: 1

Explanation

OSPF is a link-state routing protocol that maintains a link-state database representing the network topology. Routers exchange link-state information and use the Shortest Path First algorithm to calculate suitable routes through the network. OSPF can adapt to topology changes by recalculating paths when necessary. DHCP provides IP configuration, RADIUS provides centralized authentication, and LLDP provides information about directly connected neighbors. Therefore, OSPF is the routing protocol associated with a link-state database and the Shortest Path First calculation process.

Question 280

Which feature helps a switch determine which interfaces have receivers interested in specific IPv4 multicast groups?

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

Correct Answer: 3

Explanation

IGMP snooping allows a Layer 2 switch to monitor IGMP messages and learn which interfaces have hosts interested in specific IPv4 multicast groups. The switch can then use this information to forward multicast traffic only toward interfaces where interested receivers are connected. This reduces unnecessary multicast flooding and can improve bandwidth efficiency. DHCP snooping protects DHCP operations, LLDP provides neighbor discovery, and Root Guard protects the intended spanning-tree root topology. Therefore, IGMP snooping is the appropriate feature for identifying interfaces with interested multicast receivers.