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The correct answer is B. Configure an IP helper for the DHCP server. The IoT device is connected to VLAN 100, whose Layer 3 SVI is 10.100.1.1/24. The DHCP server is 10.200.1.51, which is in a different subnet. DHCP clients initially use broadcast messages to discover a DHCP server, and those broadcasts do not cross Layer 3 boundaries by default. HPE Aruba Networking AOS-CX documentation explains that DHCP relay forwards DHCP client requests to configured DHCP servers, and that the ip helper-address command defines the address of a remote DHCP server or relay agent. The documentation also states that IP helper addresses can be configured on Layer 3 interfaces, Layer 3 VLAN interfaces, and LAG interfaces. Therefore, the correct fix is to configure ip helper-address 10.200.1.51 under interface vlan100. Disabling STP is not appropriate and could create Layer 2 loop risk. A static route may be needed for reachability in some designs, but it does not relay DHCP broadcasts. Broadcast-to-unicast conversion is not the required AOS-CX DHCP relay configuration.

The correct answer is C. The wrong subnet mask has been configured. The PC is configured with IP address 10.211.55.151 and subnet mask 255.255.255.0, which is a /24 network. However, the HPE Aruba Networking CX switch SVI for VLAN 55 is configured as 10.211.55.1/25. A /25 mask divides the 10.211.55.0/24 range into two subnets: 10.211.55.0–10.211.55.127 and 10.211.55.128–10.211.55.255. The switch gateway address 10.211.55.1/25 is in the first /25 subnet, while the PC address 10.211.55.151 is in the second /25 subnet. This means the PC and its configured default gateway are not actually in the same subnet from the switch’s perspective. HPE Aruba Networking AOS-CX CLI documentation shows IP addressing on interfaces using prefix-length notation, such as /25, which defines the subnet size. Option A is incorrect because the port is configured with no shutdown and no STP error state is shown. Option B is incorrect because an access port does not require VLAN tagging from the PC. Option D is incorrect because a PC normally uses a default gateway, not a static route, for Internet access.

The correct answer is D. It is available as a cloud solution. HPE Aruba Networking Central is described in official Aruba documentation as a cloud-based management platform for managing AOS-CX infrastructure. It provides centralized functions for provisioning, configuring, monitoring, and troubleshooting AOS-CX switches. This means it is not limited to on-premises deployment. Option A is incorrect because AOS-CX support in Aruba Central is not limited only to templates; Central also supports monitoring, troubleshooting, and UI-based workflows depending on the software version, group type, and deployment model. Option B is also incorrect because monitoring-only mode is one supported option, but it is not the only supported mode. HPE Aruba documentation specifically notes that AOS-CX switches can be added in monitoring-only mode, but also separately documents configuration using templates and UI groups. Therefore, the broad and correct description for a customer conversation is that HPE Aruba Networking Central is available as a cloud management solution for AOS-CX switches.

The correct answer is D. administrators. HPE Aruba Networking AOS-CX documentation for the 4100i, 6000, and 6100 switch series states that, in addition to user-defined local groups, there are three built-in user groups: administrators, operators, and auditors. The documentation also states that the default admin account belongs to the administrators group. This makes administrators the only valid default group among the answer choices. Option A, root, is not listed as a built-in AOS-CX user group. Option B, managers, is not one of the default AOS-CX groups. Option C, super-users, is also not listed as a built-in group. These names may appear in other systems or older platforms, but on HPE Aruba Networking CX 6100 switches, the built-in local user groups are administrators, operators, and auditors. Therefore, the correct default user group from the listed options is administrators.