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Question 21

Which HPE Aruba Networking CX feature provides centralized visibility and management of network devices through a cloud-based platform?

1. STP
2. VRRP
3. HPE Aruba Networking Central
4. LACP

Correct Answer: 3

Explanation

HPE Aruba Networking Central provides cloud-based centralized management, monitoring, and visibility for supported networking infrastructure. Administrators can use it to configure devices, monitor health, review alerts, analyze network performance, and manage groups of switches and other supported devices. This centralized approach can simplify operations across distributed environments. STP is used for Layer 2 loop prevention, VRRP provides gateway redundancy, and LACP aggregates physical links. Central is particularly useful when an organization needs consistent management and operational visibility across multiple locations without relying entirely on individual device administration.

Question 22

Which protocol is primarily used to prevent Layer 2 loops in a switched Ethernet network?

1. STP
2. BGP
3. DHCP
4. NTP

Correct Answer: 1

Explanation

Spanning Tree Protocol prevents Layer 2 switching loops by creating a loop-free logical topology while allowing redundant physical links to remain available for failover. Without loop prevention, redundant Ethernet connections can cause broadcast storms, duplicate frames, and MAC address instability. STP identifies redundant paths and places selected interfaces into a blocking state while maintaining them as potential backup paths. BGP is a routing protocol, DHCP provides network configuration, and NTP synchronizes time. Proper spanning-tree design is especially important in environments where switches have multiple physical connections for redundancy.

Question 23

Which protocol is commonly used by Aruba CX switches to exchange routing information within an enterprise autonomous system?

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

Correct Answer: 2

Explanation

OSPF is an interior gateway protocol commonly used to exchange routing information within an autonomous system. It uses a link-state approach and calculates shortest paths based on its link-state database. OSPF supports hierarchical designs using areas and can provide relatively fast convergence when appropriately configured. BGP is generally used for inter-domain routing and policy-based routing relationships, while LLDP discovers directly connected neighbors. RADIUS is associated with authentication and authorization. OSPF is therefore a common choice for enterprise Layer 3 environments requiring dynamic internal routing.

Question 24

What is the primary purpose of an SVI on an Aruba CX switch?

1. To aggregate physical Ethernet links
2. To provide a Layer 3 interface associated with a VLAN
3. To discover neighboring devices
4. To synchronize device clocks

Correct Answer: 2

Explanation

A Switch Virtual Interface, or SVI, provides a logical Layer 3 interface associated with a VLAN. It can be assigned an IP address and used as a default gateway for devices within that VLAN when the switch performs Layer 3 routing. SVIs are also useful for inter-VLAN routing because the switch can route traffic between multiple VLAN interfaces. They are different from physical Ethernet interfaces because they are logical interfaces associated with VLANs. LACP handles link aggregation, LLDP provides neighbor discovery, and NTP provides time synchronization.

Question 25

Which authentication method can require a device or user to authenticate before gaining access to a wired network port?

1. 802.1X
2. MSTP
3. VRRP
4. LACP

Correct Answer: 1

Explanation

IEEE 802.1X provides port-based network access control by requiring authentication before network access is granted. It commonly works with an authentication server such as a RADIUS server. Depending on the deployment, authentication can be based on user credentials or digital certificates. This provides stronger access control than simply connecting a device to an Ethernet port. MSTP handles Layer 2 topology control, VRRP provides gateway redundancy, and LACP aggregates links. 802.1X is particularly useful in enterprise environments where administrators need to control which users or devices can connect to the wired network.

Question 26

Which Aruba CX capability can automatically identify abnormal network conditions using collected device information and analytics?

1. LACP
2. NAE
3. VRRP
4. DHCP

Correct Answer: 2

Explanation

The Network Analytics Engine, or NAE, provides analytics and monitoring capabilities within Aruba CX. It can collect and analyze information from the switch to help identify operational conditions, anomalies, and potential problems. This can reduce troubleshooting time by providing more detailed visibility into device behavior. LACP is used for link aggregation, VRRP provides gateway redundancy, and DHCP provides address configuration. NAE is particularly useful for proactive monitoring because it can help administrators detect unusual conditions before they develop into more serious service-impacting problems.

Question 27

Which protocol is used to dynamically negotiate link aggregation between compatible devices?

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

Correct Answer: 3

Explanation

Link Aggregation Control Protocol, or LACP, dynamically negotiates and maintains link aggregation between compatible devices. Multiple physical interfaces can be combined into a logical aggregation group, providing redundancy and potentially increased aggregate bandwidth. LACP also helps verify that participating interfaces belong to the appropriate aggregation relationship. LLDP is used for neighbor discovery, RADIUS provides authentication and accounting services, and OSPF exchanges routing information. LACP is commonly deployed between switches or between a switch and a server when multiple physical connections are required as part of a resilient network design.

Question 28

Which IPv6 mechanism automatically configures a host with addressing information based on router advertisements?

1. DHCPv4
2. NAT
3. ARP
4. Stateless Address Autoconfiguration

Correct Answer: 4

Explanation

IPv6 Stateless Address Autoconfiguration, commonly called SLAAC, allows hosts to configure IPv6 addresses using information received through router advertisements. The router advertises relevant network prefix information, allowing the host to construct an address without requiring a traditional DHCPv4 process. IPv6 environments can also use DHCPv6 when additional configuration information or centralized address management is required. NAT is a translation mechanism, ARP is associated with IPv4 address resolution, and DHCPv4 is used for IPv4 configuration. SLAAC is therefore an important mechanism for simplifying IPv6 host addressing.

Question 29

Which command output would be most useful for verifying the operational status and IP addressing of an Aruba CX interface?

1. Interface status and configuration information
2. DNS zone information
3. User password history
4. Certificate revocation information

Correct Answer: 1

Explanation

Interface status and configuration information can show whether an interface is administratively enabled, operationally up, and configured with the expected parameters. Depending on the command used, administrators may also see IP addressing, VLAN association, speed, duplex, and other operational details. This information is often one of the first checks during connectivity troubleshooting. DNS zone information, password history, and certificate revocation information address different operational areas. Verifying the interface state helps determine whether a problem originates at the local physical or logical interface before moving deeper into routing or application troubleshooting.

Question 30

Which routing feature allows a router to select a backup route when the preferred route becomes unavailable?

1. DHCP relay
2. Floating static route
3. LLDP
4. NAE

Correct Answer: 2

Explanation

A floating static route can act as a backup route by assigning it a higher administrative distance than the preferred route. The preferred route remains in the routing table while it is available. If that route becomes unavailable, the floating static route can become active, depending on the routing configuration. This provides a simple form of routing redundancy. DHCP relay forwards DHCP requests, LLDP discovers neighboring devices, and NAE provides analytics and monitoring. Floating static routes can be useful in smaller networks or for specific backup paths where a full dynamic routing design is unnecessary.

Question 31

Which technology provides centralized authentication and accounting for network administrators accessing network devices?

1. STP
2. LACP
3. RADIUS
4. VRRP

Correct Answer: 3

Explanation

RADIUS can provide centralized authentication, authorization, and accounting services for network access. In an administrative environment, it can allow network devices to authenticate administrators against a centralized identity service rather than maintaining separate local credentials on every device. Centralized authentication improves administrative consistency and can simplify account management. STP is used for Layer 2 loop prevention, LACP manages link aggregation, and VRRP provides gateway redundancy. RADIUS can also support user network access through technologies such as 802.1X, making it an important component of enterprise authentication architectures.

Question 32

Which IPv4 protocol is used to map a known IP address to a corresponding MAC address on a local network?

1. ARP
2. BGP
3. OSPF
4. NTP

Correct Answer: 1

Explanation

Address Resolution Protocol, or ARP, maps an IPv4 address to a MAC address on the local network. When a device needs to send an Ethernet frame to a local IPv4 destination and does not know the destination MAC address, it can use ARP to discover it. The resulting information may be stored temporarily in the ARP cache. BGP and OSPF are routing protocols, while NTP synchronizes system clocks. Understanding ARP behavior is important when troubleshooting local connectivity, duplicate addresses, unexpected MAC mappings, or other Layer 2 and Layer 3 communication problems.

Question 33

What is the primary purpose of a default route?

1. To identify every directly connected network
2. To provide a path for destinations that do not match a more specific route
3. To prevent all routing updates
4. To assign IP addresses to clients

Correct Answer: 2

Explanation

A default route provides a path for packets when the routing table does not contain a more specific matching destination route. It is commonly used on enterprise devices to direct unknown destinations toward an upstream router or Internet gateway. The default route is often represented as 0.0.0.0/0 in IPv4. It does not replace directly connected or more specific routes; routing decisions generally prefer the most specific available match. DHCP can assign IP addresses, while routing protocols exchange route information. Default routes are especially important at network boundaries where traffic must be forwarded toward an upstream network.

Question 34

Which feature helps protect a switch against MAC address table exhaustion caused by excessive source MAC addresses?

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

Correct Answer: 1

Explanation

Port security can help limit the number of MAC addresses learned on a switch interface and control how unexpected addresses are handled. This can reduce exposure to attacks that attempt to overwhelm a switch’s MAC address table with large numbers of forged source addresses. Depending on the implementation and configuration, administrators can define limits and appropriate violation behavior. NTP provides time synchronization, OSPF manages routing, and VRRP provides gateway redundancy. Port security should be implemented according to the network’s requirements because overly restrictive settings can also cause legitimate devices to lose connectivity.

Question 35

Which protocol provides secure remote CLI access to an Aruba CX switch?

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

Correct Answer: 3

Explanation

Secure Shell, or SSH, provides encrypted remote command-line access to network devices. It protects administrative sessions by encrypting credentials and management traffic between the administrator and the switch. SSH is therefore preferred over unencrypted protocols such as Telnet for remote management. FTP and TFTP are primarily file-transfer protocols and are not intended to provide interactive secure CLI administration. Proper SSH configuration should also include appropriate authentication controls, access restrictions, and secure credential management. Using secure management protocols is an important part of protecting network infrastructure from credential interception and unauthorized administrative access.

Question 36

Which protocol is specifically designed to exchange information about directly connected network devices?

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

Correct Answer: 1

Explanation

LLDP is a vendor-neutral Layer 2 discovery protocol that allows network devices to advertise information about themselves to directly connected neighbors. An administrator can use LLDP information to identify neighboring device names, interfaces, capabilities, and other available details. This is useful for documenting physical topology and troubleshooting connectivity. DHCP is used for host configuration, BGP exchanges routing information, and RADIUS provides centralized authentication and accounting. LLDP is particularly helpful in larger networks where manually tracking every physical connection can become difficult.

Question 37

Which condition would most directly cause an OSPF neighbor relationship to fail to form?

1. Matching NTP server addresses
2. Incorrect OSPF area configuration between neighbors
3. Identical interface descriptions
4. Matching LLDP settings

Correct Answer: 2

Explanation

OSPF neighbors must have compatible configuration parameters to establish an adjacency. An incorrect area configuration can prevent neighboring routers from forming the expected OSPF relationship. Other factors that can cause adjacency problems include authentication mismatches, incompatible network types, incorrect timers, duplicate router IDs, and connectivity issues. NTP configuration and interface descriptions do not directly determine whether an OSPF adjacency forms. LLDP is a separate discovery protocol and does not establish OSPF relationships. When troubleshooting OSPF, administrators should compare relevant protocol parameters on both neighboring interfaces.

Question 38

Which mechanism can help ensure that only authorized devices connect to a protected wired access port?

1. 802.1X
2. NTP
3. MSTP
4. BGP

Correct Answer: 1

Explanation

802.1X provides port-based network access control and can require authentication before a device is granted normal network access. In enterprise deployments, the switch commonly acts as the authenticator while a RADIUS server provides authentication services. Depending on the environment, authentication can use credentials or certificates. NTP synchronizes clocks, MSTP prevents Layer 2 loops, and BGP exchanges routing information. 802.1X can therefore help enforce access policies at the network edge and reduce the risk of unauthorized devices gaining unrestricted access simply by connecting to an Ethernet port.

Question 39

Which monitoring approach provides sampled information about traffic flows and interface utilization?

1. VRRP
2. sFlow
3. LACP
4. STP

Correct Answer: 2

Explanation

sFlow provides sampled traffic information that can be analyzed to understand network utilization and traffic behavior. It can help identify high-volume sources, destinations, protocols, and interfaces without requiring every packet to be captured and stored. This makes it useful for network visibility and performance analysis across large environments. VRRP provides gateway redundancy, LACP manages link aggregation, and STP prevents Layer 2 loops. sFlow data can help administrators identify congestion, unusual traffic patterns, and utilization trends, supporting both troubleshooting and capacity planning activities.

Question 40

Which configuration is most appropriate when a switch port must carry traffic for multiple VLANs between network devices?

1. Access port assigned to a single VLAN
2. Trunk configuration supporting the required VLANs
3. Loopback interface
4. Management-only interface

Correct Answer: 2

Explanation

A trunk configuration is designed to carry traffic belonging to multiple VLANs across a single physical connection. VLAN tagging, typically using IEEE 802.1Q, allows the receiving device to identify the VLAN associated with each frame. Trunk links are commonly used between switches, between switches and routers, and between switches and other devices that support multiple VLANs. An access port is normally associated with a single VLAN for an endpoint. Loopback interfaces are logical interfaces, while management-only interfaces serve administrative purposes. Correct trunk configuration is essential for maintaining VLAN connectivity between network devices.