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Question 301

Which Aruba wireless feature can help optimize radio channel assignments and transmit power based on changing RF conditions?

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

Correct Answer: 1

Explanation

AirMatch is an Aruba RF optimization capability designed to help manage wireless radio resources. It can evaluate RF conditions across the wireless environment and assist with decisions such as channel assignments and transmit-power levels. This can be especially useful in environments with many access points where neighboring radios may interfere with one another or where RF conditions change over time. RADIUS provides centralized authentication, DHCP relay forwards DHCP requests between networks, and LLDP provides neighbor information. Therefore, AirMatch is the appropriate feature for automated radio optimization based on changing RF conditions.

Question 302

Which protocol provides secure remote CLI access to an Aruba network device?

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

Correct Answer: 2

Explanation

SSH provides encrypted remote command-line access to network devices. It protects the management session by encrypting information exchanged between the administrator and the device. This includes administrative credentials and commands, making SSH preferable to insecure remote-management protocols such as Telnet. SNMP is mainly used for monitoring and management information, TFTP provides basic file transfer, and LLDP discovers directly connected devices. Therefore, SSH is the appropriate protocol when an administrator needs secure remote CLI access to an Aruba network device.

Question 303

Which wireless measurement indicates the level of background RF energy present at a wireless receiver?

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

Correct Answer: 3

Explanation

The noise floor represents the level of background RF energy detected by a wireless receiver. A high noise floor can make it more difficult for the receiver to distinguish a desired wireless signal from unwanted RF energy. This can reduce the effective SNR and contribute to wireless performance problems. RSSI measures received signal strength, SNR compares signal strength with noise, and channel utilization measures the amount of channel airtime being used. Therefore, noise floor is the metric most directly associated with background RF energy at the receiver.

Question 304

Which feature allows a switch to protect an access interface by restricting the MAC addresses that are permitted to use it?

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

Correct Answer: 1

Explanation

Port security allows administrators to restrict the MAC addresses that can use a switch interface. It is commonly applied to access ports where the expected connected devices are known. Depending on the configuration, MAC addresses can be statically assigned or dynamically learned, and the switch can take a defined action when a violation occurs. OSPF is a routing protocol, NTP synchronizes device clocks, and IGMP snooping manages multicast forwarding. Therefore, port security is the appropriate feature for controlling which MAC addresses are allowed on a switch access interface.

Question 305

Which protocol is commonly used to synchronize the system clocks of network infrastructure devices?

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

Correct Answer: 3

Explanation

Network Time Protocol, or NTP, is used to synchronize clocks across network devices and other systems. Accurate time is important for event logging, troubleshooting, security monitoring, authentication, and correlating events across multiple devices. Using a common time source allows administrators to compare timestamps more reliably when investigating network incidents. RADIUS is used for centralized authentication, SNMP supports monitoring and management, and DHCP provides network configuration. Therefore, NTP is the appropriate protocol for maintaining consistent system time across network infrastructure.

Question 306

Which Aruba Central feature provides visibility into connected clients and their characteristics to assist with troubleshooting?

1. Firmware compliance
2. Site management
3. Client Insights
4. Device reboot

Correct Answer: 3

Explanation

Client Insights provides additional visibility into connected endpoints and their characteristics within the Aruba management environment. Administrators can use client-focused information to better understand endpoint behavior and investigate connectivity or performance problems. This type of visibility is particularly useful in environments containing many different client devices and operating systems. Firmware compliance focuses on software versions, site management organizes infrastructure by location, and device reboot is an operational action rather than a client-visibility capability. Therefore, Client Insights is the appropriate Aruba Central capability for obtaining additional endpoint information.

Question 307

Which protocol allows multiple physical Ethernet links to operate as a single logical link?

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

Correct Answer: 1

Explanation

LACP, or Link Aggregation Control Protocol, allows multiple physical Ethernet links to be combined into a logical link aggregation group. This can provide redundancy and increase aggregate bandwidth between supported network devices. If one member link fails, traffic can continue through other available links, depending on the configuration and traffic conditions. DHCP provides IP configuration, RADIUS provides centralized authentication, and DNS resolves names to IP addresses. Therefore, LACP is the appropriate protocol when several physical Ethernet links need to function as one logical connection.

Question 308

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

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

Correct Answer: 3

Explanation

Address Resolution Protocol, or ARP, allows an IPv4 host to discover the MAC address associated with an IPv4 address on the local network. When the destination address is local and the corresponding MAC address is not already known, the host can send an ARP request. The device owning that IP address responds with its MAC address, allowing Layer 2 delivery to occur. DHCP provides IP configuration, DNS resolves hostnames, and NTP synchronizes clocks. Therefore, ARP is the appropriate protocol for resolving a local IPv4 address into a MAC address.

Question 309

Which switch feature helps protect the spanning-tree topology by preventing an unexpected device from becoming the root bridge through superior BPDUs?

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

Correct Answer: 2

Explanation

Root Guard helps protect the intended spanning-tree topology by preventing an interface from accepting superior BPDUs that could cause an unexpected device to influence the root bridge election. It is useful on interfaces where the administrator knows that the connected device should not become a potential STP root. DHCP snooping protects DHCP operations, port mirroring copies traffic for analysis, and SNMP provides monitoring and management information. Therefore, Root Guard is the appropriate feature for protecting the intended STP root placement.

Question 310

Which Wi-Fi capability can divide a wireless channel into smaller resource units so multiple clients can be scheduled efficiently?

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

Correct Answer: 4

Explanation

OFDMA, or Orthogonal Frequency Division Multiple Access, allows a wireless channel to be divided into smaller resource units. An access point can assign these resource units to different clients, allowing multiple devices to efficiently share available channel resources. This is particularly useful in environments with many clients and smaller traffic transmissions. TWT focuses on scheduled wake periods, MU-MIMO uses multiple spatial streams for simultaneous communication, and BSS coloring helps identify transmissions from different wireless networks. Therefore, OFDMA is the appropriate Wi-Fi capability for dividing channel resources into smaller units.

Question 311

Which authentication protocol is commonly used with enterprise wireless 802.1X deployments?

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

Correct Answer: 1

Explanation

RADIUS is commonly used as the centralized authentication server protocol in enterprise wireless deployments using 802.1X. The wireless infrastructure communicates authentication information to the RADIUS server, which validates credentials and can return authorization information. This approach supports individual user or device authentication instead of relying on one shared wireless password. OSPF provides routing, LACP provides link aggregation, and NTP synchronizes system clocks. Therefore, RADIUS is the appropriate authentication protocol for centralized enterprise wireless 802.1X deployments.

Question 312

Which feature helps prevent excessive broadcast, multicast, or unknown-unicast traffic from overwhelming a switch interface?

1. Port security
2. Storm control
3. LLDP
4. RADIUS

Correct Answer: 2

Explanation

Storm control limits excessive broadcast, multicast, and unknown-unicast traffic on a switch interface. Administrators can configure thresholds that determine how much traffic of a particular type is allowed before protective behavior occurs. This helps prevent traffic storms from consuming excessive bandwidth or switch resources and affecting other network devices. Port security controls permitted MAC addresses, LLDP provides neighbor information, and RADIUS supports centralized authentication. Therefore, storm control is the appropriate feature for controlling excessive Layer 2 traffic on a switch interface.

Question 313

Which protocol is designed to provide centralized authentication and authorization for network administrators?

1. SNMP
2. TACACS+
3. DHCP
4. ARP

Correct Answer: 2

Explanation

TACACS+ is designed for centralized authentication, authorization, and accounting of administrative access to network devices. It can provide detailed authorization controls, allowing organizations to assign different administrative privileges to different users. This is useful when network administrators need different levels of access based on their responsibilities. SNMP is primarily used for monitoring and management, DHCP provides host configuration, and ARP resolves local IPv4 addresses to MAC addresses. Therefore, TACACS+ is the appropriate protocol for centralized administrative authentication and authorization.

Question 314

Which Aruba Central capability helps administrators determine whether managed devices are running required firmware versions?

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

Correct Answer: 1

Explanation

Firmware compliance provides administrators with information about the software versions running on managed network devices and whether those versions meet defined requirements. This allows organizations to identify devices that may require upgrades and helps maintain software consistency across infrastructure. Firmware management is particularly important in larger environments where manually checking every device would be inefficient. Client Insights focuses on endpoint visibility, port mirroring copies network traffic for analysis, and MAC learning is a Layer 2 switching function. Therefore, firmware compliance is the appropriate Aruba Central capability for monitoring firmware requirements.

Question 315

Which protocol provides a mechanism for a network device to advertise information about itself to directly connected neighbors?

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 device identity, interface information, system capabilities, and other supported details. Administrators can use LLDP data to understand physical topology and troubleshoot connectivity or cabling issues. DHCP provides IP configuration, RADIUS supports centralized authentication, and OSPF exchanges Layer 3 routing information. Therefore, LLDP is the appropriate protocol for discovering directly connected network devices and their associated interface information.

Question 316

Which feature can copy selected switch traffic to a monitoring interface for packet analysis?

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

Correct Answer: 3

Explanation

Port mirroring allows a switch to copy traffic from selected interfaces or VLANs to a designated monitoring interface. A packet analyzer or security monitoring system can then inspect the copied traffic without being placed directly in the original forwarding path. This capability is useful for troubleshooting, performance analysis, and security investigations. DHCP snooping protects DHCP operations, Root Guard protects the spanning-tree root topology, and BPDU Guard protects edge interfaces from unexpected BPDUs. Therefore, port mirroring is the appropriate feature for copying switch traffic for analysis.

Question 317

Which wireless security option provides encryption for an open wireless network without requiring a shared password?

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

Correct Answer: 2

Explanation

Enhanced Open provides encryption for wireless networks that do not require users to enter a traditional shared password. It is based on Opportunistic Wireless Encryption and improves privacy compared with completely open wireless access. Unlike WPA2-Personal, it does not rely on a shared pre-shared key. WPA2-Enterprise uses centralized enterprise authentication, while WEP is an obsolete wireless security mechanism. Therefore, Enhanced Open is the appropriate option when an organization wants encrypted open wireless access without requiring a shared password.

Question 318

Which wireless technology can help compatible clients conserve battery power by negotiating scheduled times for communication?

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

Correct Answer: 3

Explanation

Target Wake Time, or TWT, allows compatible wireless clients and access points to establish scheduled communication periods. A client can remain in a low-power state during periods when communication is not expected and wake according to the negotiated schedule. This can reduce unnecessary radio activity and improve battery efficiency for supported devices. MU-MIMO enables simultaneous spatial-stream communication, BSS coloring helps identify transmissions from different BSSs, and OFDMA divides channel resources into smaller resource units. Therefore, TWT is the appropriate technology for scheduled communication and power conservation.

Question 319

Which feature can identify the switch interface through which a specific client MAC address has been learned?

1. MAC address table
2. Routing table
3. DNS cache
4. NTP database

Correct Answer: 1

Explanation

The MAC address table maintained by a Layer 2 switch records learned MAC addresses and the interfaces associated with those addresses. Administrators can use this information to locate a connected endpoint and determine the switch port where its MAC address was observed. The routing table contains Layer 3 forwarding information, DNS cache information relates hostnames to addresses, and NTP information concerns time synchronization. Therefore, the MAC address table is the appropriate source for identifying the switch interface associated with a learned client MAC address.

Question 320

Which multicast feature allows a switch to learn which interfaces contain hosts interested in specific multicast groups?

1. LLDP
2. Port security
3. DHCP snooping
4. IGMP snooping

Correct Answer: 4

Explanation

IGMP snooping allows a Layer 2 switch to monitor IGMP messages and determine which interfaces have hosts interested in particular IPv4 multicast groups. The switch can then use that information to forward multicast traffic only toward interfaces that need it instead of flooding the traffic throughout the entire VLAN. This can reduce unnecessary bandwidth consumption and improve multicast efficiency. LLDP provides neighbor discovery, port security restricts source MAC addresses, and DHCP snooping protects DHCP operations. Therefore, IGMP snooping is the appropriate feature for learning multicast receiver membership at the switch level.