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Question 221

Which wireless feature helps an access point use information about neighboring access points to optimize radio channel and transmit-power decisions?

1. AirMatch
2. DHCP snooping
3. LACP
4. TACACS+

Correct Answer: 1

Explanation

AirMatch is an Aruba wireless optimization capability designed to help manage radio-frequency resources across an environment. It can use information about the surrounding RF environment and neighboring access points when making decisions related to channel assignment and transmit power. This is especially useful in environments where many access points operate close to one another and RF conditions change over time. DHCP snooping protects DHCP operations, LACP provides link aggregation, and TACACS+ supports centralized administrative authentication and authorization. Therefore, AirMatch is the appropriate feature for automated RF optimization involving neighboring access points.

Question 222

An administrator wants to prevent a switch port from accepting frames with unexpected source MAC addresses. Which feature is most appropriate?

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

Correct Answer: 2

Explanation

Port security can restrict which source MAC addresses are permitted on a switch interface. It is useful when an administrator wants to limit the devices that can connect to a particular access port. Depending on the configuration, the switch can learn or statically define allowed MAC addresses and take action when an unauthorized address appears. LLDP provides neighbor discovery, OSPF is a dynamic routing protocol, and NTP synchronizes device clocks. Therefore, port security is the appropriate Layer 2 security feature for controlling unexpected source MAC addresses on a switch port.

Question 223

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

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

Correct Answer: 3

Explanation

RSSI, or Received Signal Strength Indicator, represents an indication of the strength of a received wireless signal. Administrators can use RSSI information when troubleshooting connectivity, coverage, and roaming behavior. A stronger received signal generally provides better conditions for communication, although signal strength alone does not guarantee good performance. SNR measures the relationship between signal and background noise, channel utilization indicates how busy a channel is, and noise floor represents the level of background RF energy. Therefore, RSSI is the metric specifically associated with received wireless signal strength.

Question 224

An administrator wants to identify whether excessive background RF energy is affecting wireless communication. Which metric should be examined?

1. Noise floor
2. VLAN ID
3. MAC address
4. DHCP lease time

Correct Answer: 1

Explanation

The noise floor represents the background level of RF energy detected by a wireless radio. A high noise floor can reduce the effective signal-to-noise ratio and negatively affect wireless communication, even when the received signal itself appears strong. Examining the noise floor can therefore help administrators identify sources of interference or other RF energy affecting the WLAN. VLAN IDs identify network segmentation, MAC addresses identify Layer 2 interfaces, and DHCP lease time controls address allocation duration. Therefore, noise floor is the appropriate metric for evaluating background RF energy.

Question 225

Which metric compares the strength of a received wireless signal against the surrounding noise level?

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

Correct Answer: 3

Explanation

SNR, or Signal-to-Noise Ratio, compares the strength of a desired wireless signal with the level of background noise. A higher SNR generally indicates that the desired signal is easier for the receiver to distinguish from unwanted RF energy. This makes SNR an important metric when troubleshooting wireless performance and determining whether clients have suitable RF conditions. RSSI measures received signal strength, channel utilization indicates how busy the channel is, and transmit power describes the power level used by a radio. Therefore, SNR is the metric that directly compares signal strength with noise.

Question 226

An administrator wants to control the maximum amount of traffic that can be transmitted through a network interface during periods of congestion. Which technology can provide traffic prioritization and handling?

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

Correct Answer: 1

Explanation

Quality of Service, or QoS, provides mechanisms for classifying, prioritizing, and managing network traffic. It is especially useful when network resources become congested and different types of traffic have different performance requirements. For example, voice and other latency-sensitive applications may receive higher priority than less time-sensitive traffic. LLDP is used for neighbor discovery, ARP maps IPv4 addresses to MAC addresses, and DNS resolves names to addresses. Therefore, QoS is the appropriate technology when administrators need to manage traffic behavior and prioritize important applications during congestion.

Question 227

Which switch feature can help prevent a broadcast, multicast, or unknown-unicast traffic storm from consuming excessive network resources?

1. Root Guard
2. Storm control
3. RADIUS
4. NTP

Correct Answer: 2

Explanation

Storm control is designed to limit excessive amounts of broadcast, multicast, or unknown-unicast traffic on a switch interface. A traffic storm can consume bandwidth and switch resources and may affect other devices connected to the network. Storm-control thresholds allow administrators to define when excessive traffic should trigger protective behavior. Root Guard protects the intended STP root topology, RADIUS provides centralized authentication, and NTP synchronizes clocks. Therefore, storm control is the appropriate feature for limiting excessive Layer 2 traffic and helping prevent traffic storms from affecting network performance.

Question 228

An administrator needs to discover directly connected network devices and identify their device and port information. Which protocol should be used?

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

Correct Answer: 2

Explanation

LLDP, or Link Layer Discovery Protocol, allows network devices to advertise information about themselves to directly connected neighbors. The information can include the device identity, interface, system capabilities, and other details depending on the implementation. Administrators can use LLDP information to understand physical connectivity and troubleshoot cabling or topology issues. DHCP provides IP configuration, RADIUS provides centralized authentication, and OSPF exchanges routing information between routers. Therefore, LLDP is the appropriate protocol for discovering directly connected network devices and their port information.

Question 229

Which authentication method allows a device to authenticate using its MAC address when 802.1X credentials are not available?

1. MAC authentication
2. OSPF
3. SNMP
4. LACP

Correct Answer: 1

Explanation

MAC authentication allows a network device to be identified and authenticated using its MAC address. It can be useful for devices that cannot perform traditional 802.1X authentication, such as certain printers, IoT devices, or other specialized equipment. In many enterprise deployments, MAC authentication can be integrated with a centralized authentication system to apply appropriate access policies. OSPF is a routing protocol, SNMP is used for network monitoring and management, and LACP combines physical links into a logical connection. Therefore, MAC authentication is the appropriate method for devices that cannot use standard 802.1X credentials.

Question 230

Which Aruba wireless capability can help reduce the impact of clients that remain associated with an access point even when another access point could provide better service?

1. DHCP relay
2. ClientMatch
3. BPDU Guard
4. SCP

Correct Answer: 2

Explanation

ClientMatch is an Aruba wireless capability designed to improve client connectivity and roaming behavior by using information about client conditions and available access points. It can help identify situations where a client may benefit from connecting to a more suitable access point or radio. This can improve overall WLAN utilization and client experience when properly configured. DHCP relay forwards DHCP requests, BPDU Guard protects switch ports from unexpected spanning-tree BPDUs, and SCP provides secure file transfer. Therefore, ClientMatch is the appropriate wireless capability for improving client association and roaming decisions.

Question 231

An administrator wants to aggregate multiple physical Ethernet links between two switches into a single logical connection. Which technology should be used?

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

Correct Answer: 2

Explanation

LACP, or Link Aggregation Control Protocol, allows multiple physical Ethernet links to be combined into a logical link aggregation group. This can provide increased aggregate bandwidth and redundancy between network devices. LACP also dynamically negotiates and maintains the participating links when both sides support the protocol. STP prevents Layer 2 loops, DHCP provides host configuration, and SNMP supports monitoring and management. Therefore, LACP is the appropriate technology for creating a logical aggregated connection from multiple physical Ethernet links.

Question 232

Which Aruba Central capability is useful for identifying configuration differences and reviewing changes made to managed network devices?

1. Configuration audit
2. DHCP relay
3. MAC authentication
4. PoE classification

Correct Answer: 1

Explanation

Configuration auditing provides administrators with visibility into device configuration changes and differences. This can help identify unexpected modifications, troubleshoot configuration problems, and maintain operational consistency across managed infrastructure. In centralized management environments, configuration visibility is particularly useful when multiple administrators or automated systems can make changes. DHCP relay handles DHCP traffic between subnets, MAC authentication provides device-based authentication, and PoE classification determines power requirements. Therefore, configuration audit is the appropriate capability when an administrator needs to review configuration differences and changes.

Question 233

An administrator needs to transfer a configuration or software file securely between a management workstation and a network device. Which protocol is appropriate?

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

Correct Answer: 3

Explanation

SCP, or Secure Copy Protocol, provides secure file transfer over an SSH-based connection. It is suitable when administrators need to move configuration files, software images, or other supported files between a management system and a network device while protecting the transfer with encryption. TFTP does not provide comparable security, FTP generally requires additional security mechanisms for protected transfers, and Telnet is an interactive remote-management protocol rather than a secure file-transfer method. Therefore, SCP is the appropriate choice when secure network-device file transfer is required.

Question 234

Which switch feature can prevent a downstream device from becoming the spanning-tree root by blocking superior BPDUs on a protected interface?

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

Correct Answer: 2

Explanation

Root Guard helps protect the intended spanning-tree topology by preventing a designated interface from accepting superior Bridge Protocol Data Units that could cause an unexpected device to become the spanning-tree root. If superior BPDUs are received on a protected interface, Root Guard can place the interface into an appropriate protected state according to the switch implementation. Port mirroring copies traffic for analysis, DHCP snooping protects DHCP operations, and SNMP provides monitoring and management information. Therefore, Root Guard is the appropriate feature for protecting the intended STP root placement.

Question 235

An administrator wants to protect an access port from receiving unexpected BPDUs from an end device. Which feature is appropriate?

1. BPDU Guard
2. OSPF
3. LACP
4. DNS

Correct Answer: 1

Explanation

BPDU Guard is commonly used on edge or access interfaces where spanning-tree BPDUs are not expected from connected end devices. If a BPDU is received on a protected interface, the switch can take a protective action such as placing the port into an error-disabled or equivalent state, depending on platform configuration. This helps prevent an unexpected device from influencing the spanning-tree topology. OSPF handles Layer 3 routing, LACP manages link aggregation, and DNS provides name resolution. Therefore, BPDU Guard is appropriate for protecting access ports from unexpected BPDUs.

Question 236

Which wireless design option provides separate network access policies for employees and guests while using the same physical access points?

1. Separate SSIDs mapped to different VLANs
2. One shared password for every user
3. Disable VLAN segmentation
4. Use only a single untagged network

Correct Answer: 1

Explanation

Separate SSIDs mapped to different VLANs allow an organization to provide distinct wireless networks while using the same physical access-point infrastructure. For example, an employee SSID can map to an internal VLAN with appropriate corporate access, while a guest SSID can map to a separate VLAN with restricted Internet-only access. This design provides logical segmentation and allows different security policies to be applied to each user group. A shared password does not provide equivalent segmentation, while disabling VLAN segmentation or using one untagged network reduces the ability to separate access policies.

Question 237

Which protocol is commonly used by network devices to synchronize their system clocks with a centralized time source?

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

Correct Answer: 2

Explanation

Network Time Protocol, or NTP, is used to synchronize system clocks across network devices and other systems. Accurate time is important for logging, troubleshooting, authentication systems, certificate validation, and security investigations. When devices use a common authoritative time source, event timestamps can be compared more reliably across the infrastructure. SNMP is primarily used for monitoring and management, LLDP provides neighbor information, and RADIUS supports centralized authentication. Therefore, NTP is the appropriate protocol for maintaining consistent system time across network infrastructure.

Question 238

An administrator wants to inspect the traffic passing through a switch interface by sending a copy of the traffic to a monitoring device. Which feature should be configured?

1. Port mirroring
2. DHCP relay
3. Root Guard
4. MAC authentication

Correct Answer: 1

Explanation

Port mirroring allows a switch to copy traffic from selected source interfaces or VLANs to a designated monitoring interface. A network analyzer or intrusion-detection system can then inspect the mirrored traffic without being directly placed in the original forwarding path. This is useful for troubleshooting, performance analysis, and security monitoring. DHCP relay forwards DHCP requests across routed networks, Root Guard protects the spanning-tree topology, and MAC authentication controls device access. Therefore, port mirroring is the appropriate feature when traffic needs to be copied to a monitoring device.

Question 239

Which IPv4 mechanism allows a host to determine the Layer 2 MAC address associated with a destination IPv4 address on the local network?

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

Correct Answer: 3

Explanation

Address Resolution Protocol, or ARP, allows an IPv4 host to determine the MAC address associated with an IPv4 address on the local Layer 2 network. When a host needs to communicate with a local IPv4 destination and does not already know the corresponding MAC address, it can use an ARP request to discover the mapping. DNS resolves hostnames to IP addresses, DHCP provides network configuration, and NTP synchronizes system clocks. Therefore, ARP is the mechanism used to associate a local IPv4 address with its corresponding Layer 2 MAC address.

Question 240

An administrator wants to reduce unnecessary multicast traffic received by switch ports that do not have interested receivers. Which feature should be enabled?

1. Storm control
2. IGMP snooping
3. LLDP
4. Port security

Correct Answer: 2

Explanation

IGMP snooping allows a Layer 2 switch to monitor Internet Group Management Protocol messages exchanged between multicast receivers and routers. The switch can use this information to determine which ports have interested multicast receivers and forward multicast traffic only where appropriate. This can reduce unnecessary multicast traffic and improve network efficiency. Storm control limits excessive traffic, LLDP provides neighbor discovery information, and port security restricts source MAC addresses. Therefore, IGMP snooping is the appropriate feature for controlling multicast forwarding based on receiver interest.