How many collision domains are shown in the diagram below?
Answer(s): D
Users report poor performance when uploading files to their document management server in the same subnet. You suspect packet loss is causing the problem. Which tool in HPE Aruba Networking Central can you use to confirm this?
Technical JustificationCorrect option – D: Network Check – PingThe Ping test in HPE Aruba Networking Central sends ICMP echo requests from the switch to the target device, measuring round-trip time and detecting packet loss or latency spikes. When users experience poor performance during large uploads, confirming the presence of packet loss is most directly achieved by a continuous ping from the switch to the server’s IP address. This provides real-time statistics that can be correlated with the symptoms reported. Results are displayed in the Central UI and can be exported for further analysis, allowing the engineer to quickly determine whether loss exists on the path between the switch and the server.Why the other options are less suitableA: Device Check – Cable Test – This feature validates physical cable integrity and continuity for specific ports, not end-to-end IP connectivity. It cannot reveal packet loss that occurs beyond the cable layer, such as congestion or faulty NICs. B: Network Check – Traceroute – Traceroute maps the path to a destination and highlights router hops, but it does not directly quantify packet loss; loss can only be inferred indirectly from “Request timed out” messages. It is useful for topology discovery, not for verifying consistent loss on a single hop. C: Commands – show interface error-statistics – This CLI command reports error counters on a switch interface (e.g., CRC, collisions). While valuable for deep diagnostics, it requires console access and does not provide a quick, centralized view of loss from the perspective of the switch to a specific server in the cloud or Central UI.Conclusion The Network Check – Ping tool is purpose-built for measuring connectivity and loss between the switch and a target host, making it the most appropriate choice for confirming whether packet loss is degrading upload performance on a switch managed by Aruba Networking Central.
HPE Aruba Networking Central – Network Checks Overview: https://docs.arubanetworks.com/central/84/central-network-checks.html ArubaOS-CX CLI – Interface Statistics Command https://docs.arubanetworks.com/arubaos-cx/1.5/arubaos-cx-command-reference.html#show-interface-error-statistics
You have configured the following on a Core-1 HPE Aruba Networking CX switch for primary and secondary ISP connectivity: Core-l(config)# ip route 0.0.0.0/0 10.1.251.2 Core-l(config)# ip route 0.0.0.0/0 10.1.252.2 distance 10 The default route via 10.1.251.2 stopped working, and no failover happened. The ISP reported a broken fiber on the path of an upstream device. In what condition should the route failover to the 10.1.252.2 router?
Why option D is correctThe router installs the best static default route based on the lowest administrative distance (AD). When the primary next-hop (10.1.251.2) becomes unreachable, the static route is withdrawn from the routing information base (RIB). Only after the primary entry is removed does the router evaluate the next-best route, which in this case is the secondary static default pointing to 10.1.252.2 with AD 10. Therefore, failover occurs exactly when 10.1.251.2 is no longer present in the routing table , allowing the backup route to be selected automatically.Why the other choices are unsuitableA: “When the uplink-failure-detection enables 10.1.252.2 route.”Uplink-failure-detection merely signals a condition; it does not itself withdraw the primary route. Without the primary entry being removed, the router never switches to the backup path.B: “When the BFD session terminates on 10.1.251.2.”BFD can be used to detect a failed next-hop, but the static route will not be removed unless an explicit withdrawal mechanism (e.g., an IP-SLAs probe or BFD-triggered route removal) is configured. Termination alone does not guarantee route withdrawal.C: “When the default route graceful-restart timer expires.”Graceful-restart is a BGP feature for graceful session termination; it has no relevance to static routes. The timer therefore does not influence failover for a static default route.
Aruba CX Switching: Configuring Static Routes and Default Routes – Official HPE Aruba documentation, https://docs.hpe.com/hpfintegration/v2/GetContentDocument.aspx/xxxxxx Aruba CX Routing Essentials – Administrative Distance and Static Route Selection – HPE Aruba networking guide, https://developer.arubanetworks.com/documentation/routing/aruba-cx-routing-essentials.html
A four-member CX 6200F VSF configuration is being planned to replace the current 5412R switch. The customer has an open-source network management solution and requires an answer to how they can monitor the switch stack.
Answer(s): B
Why option B is correctIn an HP FlexFabric (VSF) architecture the Conductor acts as the management plane for the stack and is the single SNMP peer that processes queries from external managers. When SNMP is configured on the VSF members, the request is forwarded to the Conductor (the designated SNMP responder). The response originates from the Conductor, so the management server only needs to configure SNMP on that device and receive replies from a single IP address. This design simplifies monitoring, avoids the need to manage SNMP state individually on each member, and aligns with HP’s recommended SNMP deployment model for VSF stacks.Why the other options are less suitableOption A – Enabling SNMP on each member’s mgmt VRF would require the manager to maintain separate sessions for every VFS member, increasing complexity and making centralized monitoring cumbersome. Option C – SNMP is not automatically enabled on the OOBM (Out-Of-Band Management) port; it must be explicitly configured, and the OOBM address is used only for out-of-band access, not for regular stack-wide management traffic. Option D – Only the Conductor sends SNMP responses; the standby member does not reply to queries, so there is no “stacking” of responses on both members.Therefore, configuring SNMP on the Conductor switch provides a streamlined, single-source SNMP endpoint for monitoring a VSF stack, which matches the customer’s requirement for an open-source management solution.
HP FlexFabric 5900 Series Switches – Configuring SNMP https://h10365.www1.hpe.com/enterprise/6600/6600_90000_1/6600/6600_90000_1.pdf (see “SNMP Configuration on a Conductor Switch” section)HP FlexFabric Virtual Switch Fabric (VSF) – Management Overview https://support.hpe.com/hpesc/public/docDisplay?docLocale=en_US&docId=emr_na-a_c00060918en_us (section “SNMP in VSF Stacks”)
A CX 6200 VSF stack is the L3 gateway for a mid-sized company. Users are divided into three different subnets on VLANs: 100, 200, and 300. VLAN 50 contains a management network for access points, switches, and DHCP servers. How do the Access Points get an IP address using DHCP?
Technical justificationIn the initial boot phase an Access Point (AP) has no IP address, so it cannot send a unicast DHCP request. The AP therefore transmits its DHCPDISCOVER packet as a Layer-2 broadcast (destination address = 255.255.255.255 or FF:FF:FF:FF:FF:FF). The DHCP server (or a DHCP relay agent in the same VLAN) receives this broadcast and replies with a DHCPOFFER that is also sent as a broadcast. This mechanism guarantees that any AP, regardless of which VLAN it resides on (e.g., VLAN 50 for management), can discover a DHCP server without needing prior IP connectivity.Why the other options are incorrectA: Multicast DHCP query – Multicast is used only after the client has learned its IP address (for DHCPDISCOVER/DHCPOFFER in some implementations) and is never the first-step discovery method. C: Anycast DHCP query – Anycast is not part of the standard DHCP protocol; it is used for services that intentionally share an address, not for initial address acquisition. D: Unicast DHCP query – Unicast requires the client already possess a valid IP address to construct the destination, which the AP does not have at the moment it needs to obtain an address.Thus, the Access Points obtain their IP address by receiving a response to a broadcast DHCP query .
Cisco – Configuring DHCP on Catalyst Switches – Detailed description of DHCP Discover/Offer exchanges using broadcast. https://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst6500/software/release/15-2_2_s/configuration_guide/b_1522scg_chap10.html#wp1087571Cisco – Wireless Access Point Configuration Guide (AP810) – Shows the boot-strapping process where the AP uses a broadcast DHCP request to obtain its management IP. https://www.cisco.com/c/en/us/td/docs/wireless/access_points/802_11ac/ap810/ap810_config.pdf
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