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Question 181

An administrator needs to provide secure wireless access using individual user credentials instead of a shared wireless password. Which security method should be used?

1. Open authentication
2. Static MAC filtering
3. WPA2-Personal
4. WPA2-Enterprise

Correct Answer: 4

Explanation

WPA2-Enterprise provides wireless authentication using individual credentials rather than a single shared pre-shared key. It commonly works with 802.1X and a RADIUS authentication server, allowing organizations to centralize authentication and apply policies based on user identity or role. WPA2-Personal uses a shared pre-shared key, while open authentication does not provide equivalent wireless authentication protection. Static MAC filtering identifies devices but does not provide the same user-based authentication capabilities. Therefore, WPA2-Enterprise is appropriate when each wireless user should authenticate with individual credentials.

Question 182

An administrator wants to prevent a switch interface from creating a Layer 2 loop when connected to an end-user device. Which spanning-tree protection feature is appropriate?

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

Correct Answer: 1

Explanation

BPDU Guard is commonly used on edge or access interfaces where spanning-tree BPDUs are not expected. If an unexpected BPDU arrives on a protected interface, the configured protection mechanism can place the port into a protective state. This helps prevent an unauthorized switch from participating in the spanning-tree topology through an endpoint-facing port. Root Guard protects the intended root bridge hierarchy, LACP provides link aggregation, and DHCP snooping protects against unauthorized DHCP servers. Therefore, BPDU Guard is the appropriate feature for protecting an end-user-facing switch interface.

Question 183

Which protocol allows two compatible network devices to exchange information about their directly connected interfaces and capabilities?

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

Correct Answer: 1

Explanation

LLDP, or Link Layer Discovery Protocol, allows compatible network devices to advertise information about themselves to directly connected neighbors. The information can include device identity, interface details, system capabilities, and other supported attributes. Administrators can use LLDP information to understand physical topology and troubleshoot connectivity between infrastructure devices. DHCP provides IP configuration, RADIUS provides centralized authentication and authorization, and NTP synchronizes device clocks. Therefore, LLDP is the appropriate protocol for exchanging information about directly connected network devices and their capabilities.

Question 184

An administrator wants to combine several Ethernet links into one logical interface while using dynamic negotiation between the connected devices. Which protocol should be configured?

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

Correct Answer: 2

Explanation

LACP, or Link Aggregation Control Protocol, dynamically negotiates and maintains link aggregation between compatible devices. Multiple physical Ethernet interfaces can operate as members of a logical link aggregation group, providing aggregate bandwidth and redundancy. If one physical member fails, remaining links can continue forwarding traffic, depending on the configuration. STP prevents Layer 2 loops, SNMP provides monitoring, and DNS provides name resolution. Therefore, LACP is the appropriate protocol when several physical Ethernet links need to operate together as one logically aggregated connection.

Question 185

An administrator wants to ensure that an unexpected switch cannot become the spanning-tree root through a protected interface. Which feature should be configured?

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

Correct Answer: 2

Explanation

Root Guard helps protect the intended spanning-tree hierarchy by preventing an interface from accepting superior BPDUs that could cause an unexpected device to influence root bridge selection. It is useful on interfaces where the administrator knows that a connected device should not become a path toward the spanning-tree root. DHCP snooping protects DHCP traffic, port mirroring copies traffic for analysis, and QoS manages traffic treatment. Therefore, Root Guard is the appropriate feature for protecting the intended spanning-tree root from unexpected topology changes.

Question 186

An administrator wants to monitor CPU utilization, memory usage, and interface statistics from multiple Aruba network devices through a monitoring platform. Which protocol is appropriate?

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

Correct Answer: 1

Explanation

SNMP is commonly used by network management systems to monitor operational information from network devices. Depending on the platform and configuration, SNMP can provide values such as CPU utilization, memory usage, interface counters, device status, and other supported metrics. Centralized monitoring systems can use this information to create dashboards and generate alerts. FTP is used for file transfers, DHCP provides IP configuration, and STP prevents Layer 2 loops. Therefore, SNMP is the appropriate protocol for collecting operational statistics from multiple Aruba network devices.

Question 187

A network administrator needs to limit unauthorized devices from connecting to an access switch port by controlling permitted MAC addresses. Which feature should be considered?

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

Correct Answer: 3

Explanation

Port security can restrict the number or identity of MAC addresses allowed on a switch interface. It is commonly applied to access ports where administrators expect only specific devices or a limited number of devices to connect. Depending on the platform, the switch can take a configured action when an unauthorized MAC address is detected. NTP synchronizes system time, OSPF provides dynamic routing, and DNS provides name resolution. Therefore, port security is the appropriate feature when an administrator needs to control which MAC addresses can use a switch access port.

Question 188

An administrator needs to supply electrical power to an Aruba access point through its Ethernet connection. Which capability is required?

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

Correct Answer: 3

Explanation

Power over Ethernet, or PoE, allows compatible network devices such as wireless access points to receive electrical power over Ethernet cabling. This simplifies deployment because the access point can receive power and network connectivity through the same cable. The switch must provide sufficient PoE capacity and support the required PoE standard for the connected device. OSPF is a routing protocol, DHCP provides IP configuration, and SNMP provides monitoring information. Therefore, PoE is the required capability when an Aruba access point needs to receive electrical power through its Ethernet connection.

Question 189

An administrator wants to automatically learn routes between Layer 3 switches without manually configuring every remote network. Which protocol is appropriate for a link-state routing design?

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

Correct Answer: 1

Explanation

OSPF is a link-state dynamic routing protocol that allows Layer 3 devices to exchange routing information and calculate paths automatically. OSPF routers establish neighbor relationships and maintain link-state information used to build a topology database. This allows routes to be dynamically calculated and updated when network conditions change. RADIUS is used for authentication, TFTP provides basic file transfer, and LLDP provides neighbor discovery. Therefore, OSPF is appropriate when Layer 3 switches need to dynamically learn routes in a link-state routing environment.

Question 190

A wireless administrator wants to provide guests with Internet access while isolating them from internal corporate resources. Which design should be implemented?

1. Place guests in the management VLAN
2. Use the same VLAN as employees
3. Disable access controls
4. Use a dedicated guest VLAN with appropriate policies

Correct Answer: 4

Explanation

A dedicated guest VLAN provides logical separation between guest traffic and corporate networks. Security policies can then restrict access from the guest VLAN to internal corporate resources while allowing approved Internet connectivity. Placing guests in the management VLAN or employee VLAN would weaken network separation and could expose sensitive resources. Disabling access controls would further reduce security. Therefore, using a dedicated guest VLAN with appropriate access policies is the appropriate design for providing visitor Internet access while protecting internal corporate resources.

Question 191

Which service allows network devices to synchronize their clocks with a reliable time source?

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

Correct Answer: 2

Explanation

NTP, or Network Time Protocol, allows network devices to synchronize their clocks with configured time sources. Accurate time synchronization is important for logging, troubleshooting, monitoring, authentication, and security investigations. When multiple network devices use a common time source, administrators can correlate events more reliably across the infrastructure. RADIUS provides authentication and authorization, SNMP provides monitoring information, and DHCP provides network configuration. Therefore, NTP is the appropriate service for synchronizing network device clocks with a reliable time source.

Question 192

An administrator needs to identify the interface through which a particular MAC address was learned by an Aruba switch. Which information should be examined?

1. Routing table
2. DNS records
3. MAC address table
4. NTP configuration

Correct Answer: 3

Explanation

The MAC address table contains learned Layer 2 addresses and associates them with switch interfaces and VLAN information. Administrators can search this table for a particular MAC address to determine where the switch has learned the device. This is useful when troubleshooting connectivity, locating devices, or verifying Layer 2 forwarding behavior. The routing table contains Layer 3 routes, DNS records concern name resolution, and NTP configuration concerns time synchronization. Therefore, the MAC address table is the appropriate information to examine when locating a learned MAC address.

Question 193

An administrator wants to prevent excessive broadcast traffic from overwhelming a switch interface. Which feature can limit this type of traffic?

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

Correct Answer: 1

Explanation

Storm control can limit excessive broadcast traffic and, depending on the platform, may also control multicast and unknown-unicast traffic. This helps protect network resources when abnormal traffic levels occur. Without appropriate controls, a broadcast storm can consume substantial bandwidth and negatively affect other devices on the network. RADIUS provides authentication, LLDP provides neighbor information, and NTP synchronizes device clocks. Therefore, storm control is the appropriate feature for limiting excessive broadcast traffic and reducing the potential impact of a Layer 2 traffic storm.

Question 194

An administrator wants to apply different priority treatment to voice and data packets when network congestion occurs. Which technology should be configured?

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

Correct Answer: 3

Explanation

Quality of Service, or QoS, allows network traffic to be classified and treated according to application requirements. Voice traffic can be sensitive to delay, jitter, and packet loss, so QoS policies can provide appropriate queuing and scheduling during periods of congestion. QoS may use classification and markings such as DSCP to identify different traffic classes. ARP resolves IPv4 addresses to MAC addresses, DNS provides name resolution, and DHCP supplies IP configuration. Therefore, QoS is the appropriate technology for providing different forwarding treatment to voice and data traffic.

Question 195

An administrator wants to reduce unnecessary multicast forwarding by allowing a switch to learn which ports have interested multicast receivers. Which feature should be used?

1. STP
2. DHCP relay
3. IGMP snooping
4. LACP

Correct Answer: 3

Explanation

IGMP snooping allows a switch to examine IGMP membership information and identify ports with hosts interested in specific multicast groups. The switch can then forward multicast traffic only toward relevant ports instead of flooding it throughout the VLAN. This improves multicast efficiency and can reduce unnecessary bandwidth consumption. STP prevents Layer 2 loops, DHCP relay forwards DHCP messages between networks, and LACP combines physical links. Therefore, IGMP snooping is the appropriate feature for controlling multicast forwarding based on receiver membership.

Question 196

An administrator wants to view traffic from a switch interface using an external packet analyzer without interrupting normal forwarding. Which feature should be configured?

1. Port mirroring
2. OSPF
3. DHCP snooping
4. NTP

Correct Answer: 1

Explanation

Port mirroring copies selected traffic from a source interface or VLAN to a designated monitoring interface. An external packet analyzer can then inspect the copied frames while the original traffic continues through the normal forwarding process. This is useful for troubleshooting, performance analysis, and security investigations. OSPF provides dynamic routing, DHCP snooping protects DHCP operations, and NTP synchronizes device clocks. Therefore, port mirroring is the appropriate feature when traffic needs to be analyzed without directly interrupting normal forwarding.

Question 197

An administrator needs to securely transfer a configuration file between a management workstation and a network device over an encrypted session. Which protocol is appropriate when supported?

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

Correct Answer: 2

Explanation

SCP, or Secure Copy Protocol, provides encrypted file transfer using SSH-based security. It is suitable for transferring configuration files or other supported files when confidentiality and secure transport are required. TFTP does not provide encryption, while traditional FTP does not provide the same secure transport by itself. Telnet is an interactive management protocol and is not intended for secure file transfer. Therefore, SCP is the appropriate protocol when a network device supports it and an administrator needs to transfer files securely between the device and a management workstation.

Question 198

An administrator wants to organize managed Aruba devices so that common configuration settings can be applied to devices serving similar purposes. Which Aruba Central feature should be used?

1. ARP table
2. MAC address table
3. Device group
4. Routing table

Correct Answer: 3

Explanation

Device groups in Aruba Central can be used to organize managed devices and apply common configuration settings to devices with similar requirements. This simplifies administration and helps maintain configuration consistency across multiple devices. For example, similar branch switches or access points can be organized together when they require common policies. ARP tables store IP-to-MAC mappings, MAC address tables contain Layer 2 forwarding information, and routing tables contain Layer 3 routes. Therefore, a device group is the appropriate Aruba Central feature for organizing devices that require shared configuration settings.

Question 199

A network administrator wants to validate whether a remote IP address is reachable before troubleshooting higher-level application services. Which test should be performed?

1. Ping
2. SNMP polling
3. LLDP discovery
4. Syslog analysis

Correct Answer: 1

Explanation

Ping provides a basic IP connectivity test by sending ICMP echo requests to a destination and evaluating the responses. It can indicate whether the destination is reachable and can provide information about response time and packet loss. A successful ping does not prove that an application service is available, but it establishes useful information about basic IP connectivity. SNMP polling is used for monitoring, LLDP identifies directly connected neighbors, and Syslog provides event information. Therefore, ping is an appropriate initial test when validating remote IP reachability.

Question 200

An administrator needs to isolate network management traffic from normal user traffic on an Aruba switching infrastructure. Which configuration is appropriate?

1. Increase interface bandwidth
2. Disable VLAN tagging
3. Configure a dedicated management VLAN
4. Disable spanning tree

Correct Answer: 3

Explanation

A dedicated management VLAN provides logical separation between network management traffic and ordinary user traffic. Management interfaces and authorized administrative systems can be placed within this VLAN, while access-control policies can restrict who is permitted to reach management services. Increasing interface bandwidth does not create logical separation, disabling VLAN tagging can interfere with VLAN transport, and disabling spanning tree can introduce Layer 2 loops. Therefore, a dedicated management VLAN is an appropriate configuration for isolating network management traffic from normal user traffic.