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The correct answer is D. 3311. HPE Aruba Networking AOS-CX documentation identifies valid VLAN IDs as being in the range of 1 to 4094 for VLAN-related configuration, including access VLANs and trunk/native VLANs. Because 3311 falls inside the valid configurable VLAN ID range, it is the only valid option listed. Option A, 4096, is invalid because it is above the supported VLAN ID range. Option B, 0, is invalid because configurable VLAN IDs begin at 1. Option C, 32768, is far outside the supported VLAN ID range and cannot be configured as a VLAN ID on a CX switch. This question tests the standard IEEE 802.1Q VLAN ID range as applied in HPE Aruba Networking CX configuration. The supported configurable VLAN range is 1 through 4094, with VLAN 1 commonly used as the default VLAN and VLAN IDs such as 3311 available for administrator-defined VLANs.

The correct answer is D. As a response to the broadcast DHCP query. DHCP clients initially do not have an IP address, so they commonly use broadcast DHCP discovery/request traffic to locate a DHCP server on the local network. HPE Aruba Networking documentation for DHCP relay explains that when a DHCP client broadcasts a request, the DHCP relay agent on the switch receives the packets and forwards them to the DHCP server as unicast requests. In this scenario, the access points are in VLAN 50, and VLAN 50 also contains DHCP servers. Because the DHCP server is on the same local management VLAN as the APs, the APs can obtain addresses through the normal DHCP broadcast process within that VLAN. Anycast and multicast are not used for the basic DHCP address request in this scenario. A unicast DHCP relay message can occur between a relay agent and a DHCP server when the server is on another subnet, but the client-side DHCP discovery begins as broadcast traffic.

The correct answer is C. auditors. HPE Aruba Networking AOS-CX documentation for the 6200, 6300, and 6400 switch series identifies three built-in user groups: administrators, operators, and auditors. These built-in groups have fixed privileges. The administrators group has full privileges, including full CLI access, firmware upgrades, configuration viewing, configuration changes, and user account management. The operators group has no switch configuration privileges and is mainly limited to basic display-only access and viewing nonsensitive configuration information. The auditors group is restricted to audit-related functions. Since the question asks which user group exists by default on a CX 6400 Series switch, “auditors” is the only listed option that matches the HPE Aruba Networking AOS-CX built-in groups. The other options—read-only, restricted, and reporting—are not listed as default built-in AOS-CX user groups for the CX 6400 platform. This makes option C the verified answer.

The correct answer is A. API. HPE Aruba Networking Fabric Composer is an orchestration and management platform for supported AOS-CX switches. HPE Aruba Networking Fabric Composer documentation describes Fabric Composer as managing and orchestrating HPE Aruba Networking AOS-CX switch fabrics and includes an API Explorer containing Fabric Composer API documentation. The Fabric Composer guide also describes system settings for switch polling, switch events through a web socket connection, and enhanced logging of API calls. This aligns with Fabric Composer using API-based communication and orchestration rather than traditional CLI-only management. SSH can be used for direct administrator access to a switch, but it is not the best answer for Fabric Composer’s switch-management communication method. Telnet is insecure and not appropriate. SNMPv3 is useful for secure monitoring, but it is not the protocol used by Fabric Composer for configuration orchestration of CX switches. Therefore, the correct option is API.