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Question 101

An administrator wants to authenticate network administrators against a centralized authentication server for device management. Which protocol is commonly used for this purpose?

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

Correct Answer: 2

Explanation

TACACS+ is commonly used for centralized authentication, authorization, and accounting of network administrators accessing infrastructure devices. It separates authentication and authorization functions and can provide detailed control over administrative commands. This makes it useful when organizations want centralized management of administrator access to Aruba network equipment. DHCP is used to assign IP configuration, DNS provides name resolution, and NTP synchronizes system clocks. Therefore, TACACS+ is the appropriate protocol when centralized authentication and authorization are required for administrative access to network devices.

Question 102

Which Aruba Central capability allows administrators to organize managed devices according to logical network locations or organizational structures?

1. Groups
2. ARP tables
3. DHCP scopes
4. Routing metrics

Correct Answer: 1

Explanation

Aruba Central uses groups to organize and manage network devices through a centralized management structure. Devices assigned to a group can receive common configuration settings and management policies, making administration more consistent across similar deployments. Groups can be useful for separating environments such as branches, campuses, or different organizational requirements. ARP tables contain Layer 2 address-resolution information, DHCP scopes manage IP address allocation, and routing metrics influence path selection. Therefore, groups are the appropriate Aruba Central capability for organizing managed infrastructure and applying consistent configuration policies.

Question 103

An administrator needs to identify the neighboring network devices connected to an Aruba switch port. Which protocol can provide this information?

1. LLDP
2. FTP
3. RADIUS
4. SMTP

Correct Answer: 1

Explanation

LLDP, or Link Layer Discovery Protocol, allows network devices to advertise information about themselves to directly connected neighboring devices. Administrators can use LLDP information to identify connected devices, interface relationships, device capabilities, and other supported details. This can be especially useful when troubleshooting physical connectivity or documenting network topology. FTP is used for file transfers, RADIUS provides authentication and authorization, and SMTP is associated with email transport. Therefore, LLDP is the appropriate protocol for discovering information about neighboring network devices connected to Aruba switches.

Question 104

Two physical Ethernet links need to operate as one logical connection to increase available bandwidth and provide link redundancy. Which technology should be used?

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

Correct Answer: 3

Explanation

LACP, or Link Aggregation Control Protocol, allows multiple physical Ethernet links to be combined into a logical link aggregation group. This can increase available aggregate bandwidth and provide redundancy if one member link fails. The connected devices must be configured consistently for the aggregation to operate correctly. STP is designed primarily to prevent Layer 2 loops, while SNMP is used for monitoring and NTP is used for time synchronization. Therefore, LACP is the appropriate technology when multiple physical links need to function as one logical connection.

Question 105

An administrator wants to prevent a Layer 2 access port from participating in an unauthorized spanning-tree topology. Which feature can provide protection on an edge port?

1. BPDU Guard
2. DHCP Relay
3. NAT
4. DNS

Correct Answer: 1

Explanation

BPDU Guard can protect an edge or access port by placing the port into a protective state when unexpected Bridge Protocol Data Units are received. This helps prevent unauthorized switches from influencing the spanning-tree topology through ports that are intended for end devices. DHCP relay forwards DHCP messages between different IP networks, NAT translates addresses, and DNS provides name resolution. BPDU Guard should be applied carefully to ports where receiving BPDUs is not expected. Therefore, BPDU Guard is the appropriate feature for protecting an edge port from unexpected spanning-tree participation.

Question 106

Which protocol is primarily responsible for preventing Layer 2 switching loops in a redundant Ethernet topology?

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

Correct Answer: 2

Explanation

Spanning Tree Protocol, or STP, prevents Layer 2 loops by logically blocking redundant paths while maintaining them as potential backup paths. Without loop prevention, redundant Ethernet connections could cause broadcast storms, duplicate frames, and unstable MAC address learning. STP calculates a loop-free logical topology and can unblock an alternate path when the active path fails. DHCP handles IP configuration, RADIUS handles centralized authentication, and SNMP provides monitoring information. Therefore, STP is the technology used to prevent Layer 2 switching loops in redundant Ethernet networks.

Question 107

An administrator wants to restrict the number of MAC addresses that can be learned on an access port connected to an end device. Which security capability should be considered?

1. Port security
2. NTP authentication
3. DNS forwarding
4. IP routing

Correct Answer: 1

Explanation

Port security can restrict which or how many MAC addresses are permitted on a switch interface. This helps reduce the risk of unauthorized devices being connected to an access port and can provide additional Layer 2 access control. Depending on the platform and configuration, administrators can define limits and actions when unexpected MAC addresses are detected. NTP authentication protects time synchronization, DNS forwarding handles name-resolution requests, and IP routing manages Layer 3 packet forwarding. Therefore, port security is the appropriate capability when controlling the number of permitted MAC addresses on an access port.

Question 108

An administrator needs to ensure that an IP phone receives electrical power directly from a compatible Ethernet switch port. Which technology is relevant?

1. PoE
2. OSPF
3. LLDP
4. Syslog

Correct Answer: 1

Explanation

Power over Ethernet, or PoE, allows compatible network devices to receive electrical power over Ethernet cabling while also carrying network traffic. It is commonly used for devices such as IP phones, wireless access points, and security cameras. PoE simplifies deployment because a separate electrical power cable may not be required at the device location. OSPF is a dynamic routing protocol, LLDP provides neighbor discovery information, and Syslog provides centralized event logging. Therefore, PoE is the relevant technology when an Ethernet switch must provide power to a compatible endpoint.

Question 109

Which routing protocol uses neighbor relationships and link-state information to calculate paths through an IP network?

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

Correct Answer: 2

Explanation

OSPF is a link-state interior gateway routing protocol that establishes neighbor relationships with other OSPF routers and exchanges link-state information. Routers use the resulting link-state database to calculate paths through the network. OSPF is commonly used in enterprise networks because it supports hierarchical design and dynamic route calculation. DHCP provides IP configuration, RADIUS provides authentication services, and SNMP supports network monitoring. Therefore, OSPF is the appropriate protocol when routers need to dynamically exchange link-state information and calculate IP routing paths.

Question 110

An administrator wants to provide a fixed route that sends all unknown IPv4 destinations toward an upstream router. Which route is appropriate?

1. Host route
2. Loopback route
3. Default route
4. Connected route

Correct Answer: 3

Explanation

A default route is used when a router does not have a more specific route for a destination. For IPv4, the default route is commonly represented as 0.0.0.0/0. It can direct unknown destinations toward an upstream router or Internet gateway. A host route identifies a specific host, a loopback route refers to a logical local interface, and a connected route represents a directly attached network. Therefore, a default route is the appropriate choice when unknown destinations should be forwarded to an upstream router.

Question 111

An administrator wants to inspect traffic passing through a switch interface by copying selected packets to another monitoring port. Which feature should be used?

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

Correct Answer: 1

Explanation

Port mirroring copies traffic from one or more source interfaces or VLANs to a designated monitoring interface. A network analyzer connected to the monitoring interface can then inspect the copied traffic for troubleshooting, performance analysis, or security investigation. Port mirroring does not normally alter the original traffic flow. DHCP snooping is a Layer 2 security feature related to DHCP messages, NTP synchronizes clocks, and RADIUS provides centralized authentication. Therefore, port mirroring is the appropriate feature when administrators need to analyze traffic from a switch interface.

Question 112

Which security feature can help protect a switched network from unauthorized DHCP servers?

1. LLDP
2. DHCP snooping
3. OSPF
4. LACP

Correct Answer: 2

Explanation

DHCP snooping helps protect a Layer 2 network by distinguishing trusted and untrusted switch ports for DHCP traffic. DHCP server responses can be permitted only through trusted interfaces, helping prevent an unauthorized device from acting as a DHCP server and providing incorrect network configuration to clients. LLDP provides neighbor discovery, OSPF provides dynamic routing, and LACP manages link aggregation. DHCP snooping can also provide information used by other security mechanisms depending on the platform. Therefore, DHCP snooping is the appropriate feature for protecting a switched network against unauthorized DHCP servers.

Question 113

An administrator wants to reduce the risk of ARP-based attacks after DHCP snooping information has been established. Which feature can validate ARP traffic against trusted bindings?

1. Dynamic ARP Inspection
2. NTP
3. STP
4. SNMP

Correct Answer: 1

Explanation

Dynamic ARP Inspection, or DAI, can validate ARP packets by comparing them against trusted IP-to-MAC address bindings. These bindings can be obtained from DHCP snooping information on platforms that support the integration. The purpose is to reduce the possibility of malicious or incorrect ARP information being accepted by the switching infrastructure. NTP provides time synchronization, STP prevents Layer 2 loops, and SNMP provides management and monitoring information. Therefore, Dynamic ARP Inspection is the appropriate security mechanism when validating ARP traffic against trusted bindings.

Question 114

An Aruba Central administrator needs to apply a consistent configuration to multiple devices rather than configuring every device individually. Which capability is most appropriate?

1. Configuration template
2. Ping
3. ARP cache
4. MAC address table

Correct Answer: 1

Explanation

Configuration templates can help administrators apply consistent configuration settings to multiple managed devices. This approach reduces repetitive manual configuration and helps maintain standardization across similar deployments. Templates can be particularly useful when many switches or access points require common settings. Ping is a connectivity test, an ARP cache contains IP-to-MAC mappings, and a MAC address table records learned Layer 2 addresses. Therefore, a configuration template is the appropriate capability when administrators need to deploy common configuration settings across multiple managed Aruba devices.

Question 115

An administrator wants to ensure that network devices remain on an approved software version across a managed deployment. Which management task addresses this requirement?

1. Firmware compliance
2. Port mirroring
3. MAC learning
4. ARP resolution

Correct Answer: 1

Explanation

Firmware compliance involves checking whether managed network devices are running approved software or firmware versions. Maintaining consistent and supported firmware versions can simplify operations, improve feature consistency, and help administrators manage security and maintenance requirements. Port mirroring is used for traffic analysis, MAC learning builds Layer 2 forwarding information, and ARP resolves IPv4 addresses to MAC addresses. In a centralized management environment such as Aruba Central, administrators can monitor device software versions and identify devices that require updates. Therefore, firmware compliance is the relevant management task.

Question 116

Which QoS marking is commonly used to classify and prioritize IP traffic at Layer 3?

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

Correct Answer: 1

Explanation

DSCP, or Differentiated Services Code Point, is a field in the IP header used to classify packets for Quality of Service treatment. Network devices can use DSCP markings to identify traffic classes and apply appropriate queuing, scheduling, or prioritization policies. This is useful for applications that have different performance requirements, such as voice and video. ARP resolves IPv4 addresses to MAC addresses, DHCP provides IP configuration, and LLDP provides neighbor discovery. Therefore, DSCP is the appropriate marking when classifying IP traffic for Layer 3 QoS treatment.

Question 117

An administrator wants switches to suppress unnecessary multicast traffic from being forwarded to ports where no interested receivers exist. Which feature should be considered?

1. DHCP relay
2. IGMP snooping
3. NTP
4. TACACS+

Correct Answer: 2

Explanation

IGMP snooping allows a Layer 2 switch to examine Internet Group Management Protocol messages and determine which ports have interested multicast receivers. The switch can then forward multicast traffic selectively rather than flooding it to every port in the VLAN. This can reduce unnecessary bandwidth consumption and improve multicast efficiency. DHCP relay forwards DHCP requests between networks, NTP synchronizes time, and TACACS+ supports centralized administrative authentication and authorization. Therefore, IGMP snooping is the appropriate feature for controlling multicast forwarding based on receiver membership.

Question 118

An administrator is deploying a high-availability switch pair and wants the two switches to operate together while maintaining redundant control and forwarding paths. Which Aruba technology may be used on supported CX platforms?

1. VSX
2. FTP
3. RADIUS
4. DHCP

Correct Answer: 1

Explanation

VSX, or Virtual Switching Extension, is an Aruba CX technology designed for high-availability switch pairs. It allows two physical switches to operate together while maintaining separate control planes and providing redundant network paths. VSX can support designs where downstream or upstream devices use redundant connections to the switch pair, helping improve resiliency. FTP is a file-transfer protocol, RADIUS provides centralized authentication, and DHCP provides IP configuration. Therefore, VSX is the relevant Aruba CX technology for supported high-availability switch-pair designs.

Question 119

An administrator needs to securely access an Aruba CX switch remotely and execute CLI commands over an encrypted management session. Which protocol should be used?

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

Correct Answer: 3

Explanation

SSH provides encrypted remote command-line access and is commonly used for secure management of network infrastructure. It protects management sessions from exposure over the network and supports authentication mechanisms appropriate for administrative access. Telnet provides remote CLI access but does not offer equivalent encryption, while TFTP is designed for simple file transfers. SNMP is primarily used for monitoring and management data exchange rather than interactive CLI sessions. Therefore, SSH is the appropriate protocol for securely accessing an Aruba CX switch remotely and executing CLI commands.

Question 120

An administrator wants to automate interactions with an Aruba network management platform using software instead of manually performing every operation through the graphical interface. Which capability is most relevant?

1. API access
2. Console cable
3. Port mirroring
4. STP

Correct Answer: 1

Explanation

API access allows software applications and automation tools to interact programmatically with supported network management platforms. Administrators can use APIs to retrieve information, automate configuration tasks, integrate network management with other systems, and reduce repetitive manual operations. A console cable provides local management access, port mirroring copies network traffic for analysis, and STP prevents Layer 2 loops. API capabilities depend on the platform and available endpoints, authentication methods, and permissions. Therefore, API access is the appropriate capability when network management tasks need to be automated through software.