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Review endpoint counts by class, anticipated additions, PoE budgets and uplink utilization peaks. These checks can help with Port density and growth headroom, but they are not the most discriminating first evidence here. Examine: Inspect authorized DHCP server ports, binding tables, protected VLANs, ARP counters and switch feature support. Scenario: A DHCP snooping rollout blocks authorized client leases because its only relay/uplink port was not trusted.

Inspect role download status, authentication result, role mapping, ACL application, device/platform support and enforcement counters. These checks can help with Dynamic segmentation downloadable roles policy, but they are not the most discriminating first evidence here. Examine: Inspect authorized DHCP server ports, binding tables, protected VLANs, ARP counters and switch feature support. Scenario: A DHCP snooping rollout blocks authorized client leases because its only relay/uplink port was not trusted.

Check endpoint identity, allowed MAC profiles, primary 802.1X attempts, fallback order, authentication timeout and role policy. These checks can help with MAC authentication and critical access fallback, but they are not the most discriminating first evidence here. Examine: Inspect authorized DHCP server ports, binding tables, protected VLANs, ARP counters and switch feature support. Scenario: A DHCP snooping rollout blocks authorized client leases because its only relay/uplink port was not trusted.

Use scheduled and validated AOS-CX software maintenance with platform-specific images, checkpoints and supported fallback approach. This action instead applies to Firmware maintenance compatibility and image fallback. Software maintenance must verify active image and network behavior rather than stop at successful upload of a file. It does not directly resolve the controlling requirement. The targeted response is: Size distributed or collapsed core switching based on site scale, resilient paths, routed boundaries and maintenance windows. Scenario: A branch redesign creates redundant cables but has no documented forwarding or reconvergence behavior.

Calculate access ports, PoE classes and spare uplink capacity from endpoint inventory and growth rather than ordering by current occupied ports alone. This action instead applies to Port density and growth headroom. Port availability, available watts and uplink throughput are separate constraints in campus switch sizing. It does not directly resolve the controlling requirement. The targeted response is: Size distributed or collapsed core switching based on site scale, resilient paths, routed boundaries and maintenance windows. Scenario: A branch redesign creates redundant cables but has no documented forwarding or reconvergence behavior.

Schedule VLAN creation, trunk allowance, SVI services and routing prerequisites before switching live endpoint traffic. This action instead applies to Dependency ordering for VLAN and routed cutovers. Changes to L2 carriage and L3 gateway reachability must be ordered to avoid transient black holes. It does not directly resolve the controlling requirement. The targeted response is: Size distributed or collapsed core switching based on site scale, resilient paths, routed boundaries and maintenance windows. Scenario: A branch redesign creates redundant cables but has no documented forwarding or reconvergence behavior.

Separate OSPF adjacency failure from absent advertised prefixes by inspecting both neighbor state and routing tables. This action instead applies to OSPF neighbor and route missing root cause. OSPF FULL is a control-plane milestone; missing connected networks or rejected LSAs can still prevent reachability. It does not directly resolve the controlling requirement. The targeted response is: Restore only the approved missing VLAN tags and native VLAN relationship at both ends of an uplink, then test representative hosts. Scenario: An engineer proposes permitting all 4094 VLANs on the trunk to solve one missing voice VLAN.

Distinguish loss of light or cabling/optic errors from configuration faults using interface and transceiver diagnostics before changing routing policy. This action instead applies to Physical link failure diagnostics. A Layer 1 fault should be isolated with optical and electrical evidence before troubleshooting Layer 3 protocols. It does not directly resolve the controlling requirement. The targeted response is: Restore only the approved missing VLAN tags and native VLAN relationship at both ends of an uplink, then test representative hosts. Scenario: An engineer proposes permitting all 4094 VLANs on the trunk to solve one missing voice VLAN.

Create a controlled activation and validation order for routing peers, route redistribution and default gateway reachability. This action instead applies to Routing and convergence implementation gates. A peering session being established is not evidence all intended prefixes are advertised or filtered correctly. It does not directly resolve the controlling requirement. The targeted response is: Restore only the approved missing VLAN tags and native VLAN relationship at both ends of an uplink, then test representative hosts. Scenario: An engineer proposes permitting all 4094 VLANs on the trunk to solve one missing voice VLAN.

Compare deployed AOS-CX configurations against approved Aruba Central templates or version-controlled intended state and record exceptions. This step pertains to Centralized configuration drift audit but is not one of the two complementary decisions in this case. The required response and evidence are: Use least-privilege authenticated REST GET requests to audit switch state and avoid embedding credentials in scripts or logs. Together with: Review API role, HTTPS service VRF, TLS validation, token storage, resource responses and request logs. Scenario: A Python script logs the HTTPS bearer token alongside its entire request URL during switch inventory.

Every required capability is supported on the selected hardware and validated release, with documented exceptions for unsupported functions. This step pertains to AOS-CX feature and software compatibility matrix but is not one of the two complementary decisions in this case. The required response and evidence are: Use least-privilege authenticated REST GET requests to audit switch state and avoid embedding credentials in scripts or logs. Together with: Review API role, HTTPS service VRF, TLS validation, token storage, resource responses and request logs. Scenario: A Python script logs the HTTPS bearer token alongside its entire request URL during switch inventory.

Check template parameter coverage, model firmware, intended diffs, test switch result, scope and staged deployment audit. This step pertains to Config template test and promotion pipeline but is not one of the two complementary decisions in this case. The required response and evidence are: Use least-privilege authenticated REST GET requests to audit switch state and avoid embedding credentials in scripts or logs. Together with: Review API role, HTTPS service VRF, TLS validation, token storage, resource responses and request logs. Scenario: A Python script logs the HTTPS bearer token alongside its entire request URL during switch inventory.

Subscribers receive expected streams without flooding non-subscribing access ports or triggering avoidable congestion. This result is associated with Multicast flooding and receiver path performance; it does not demonstrate the requested network behavior. The relevant acceptance test is: Unauthorized switch connections trigger controlled protection without disabling valid uplinks. Scenario: An operator enables edge-port BPDU guard on a distribution trunk and the port disables upon receiving legitimate control frames.

Qualified members forward as one logical uplink while an incompatible member stays out without a loop. This result is associated with LACP link aggregation member consistency; it does not demonstrate the requested network behavior. The relevant acceptance test is: Unauthorized switch connections trigger controlled protection without disabling valid uplinks. Scenario: An operator enables edge-port BPDU guard on a distribution trunk and the port disables upon receiving legitimate control frames.

A legacy device gains only the intended restricted access while unauthorized MACs do not inherit broad corporate privileges. This result is associated with MAC authentication and critical access fallback; it does not demonstrate the requested network behavior. The relevant acceptance test is: Unauthorized switch connections trigger controlled protection without disabling valid uplinks. Scenario: An operator enables edge-port BPDU guard on a distribution trunk and the port disables upon receiving legitimate control frames.

Differentiate RADIUS latency and repeated endpoint authentication churn from application packet loss or physical interface faults. This action instead applies to Authentication storms and endpoint retry load. Authentication storms can degrade perceived access and control-plane performance despite normal link LEDs. It does not directly resolve the controlling requirement. The targeted response is: Use per-hop VLAN and trunk inspection to locate an endpoint broadcast domain missing from the authorized path. Scenario: A newly migrated server port is assigned to VLAN 220 while the uplink carries only VLAN 200 and 210.

Use supported AOS-CX API endpoints and role-scoped service accounts for automations, separating read-only audits from approved changes. This action instead applies to REST API and configuration-tool integration boundaries. API availability, versioning and authorization govern integrations; an HTTP success status must be correlated with network state. It does not directly resolve the controlling requirement. The targeted response is: Use per-hop VLAN and trunk inspection to locate an endpoint broadcast domain missing from the authorized path. Scenario: A newly migrated server port is assigned to VLAN 220 while the uplink carries only VLAN 200 and 210.

Restore only the approved missing VLAN tags and native VLAN relationship at both ends of an uplink, then test representative hosts. This action instead applies to Correct trunk VLAN remediation. Broadly allowing every VLAN may restore one workload but violate segmentation requirements. It does not directly resolve the controlling requirement. The targeted response is: Use per-hop VLAN and trunk inspection to locate an endpoint broadcast domain missing from the authorized path. Scenario: A newly migrated server port is assigned to VLAN 220 while the uplink carries only VLAN 200 and 210.

A single uplink or chassis link failure leaves the supported peer topology in a predictable operating state. This step pertains to Resilient peer cabling and link map but is not one of the two complementary decisions in this case. The required response and evidence are: Restrict SSH, HTTPS and management VRF exposure and apply individual authenticated administrator roles before enabling remote management. Together with: Check enabled management services by VRF, ACLs, user roles, TLS/SSH settings, logging, NTP and out-of-band recovery. Scenario: A campus engineer exposes the REST API on an unrestricted production data VRF for temporary automation.

Check group membership entries, IGMP reports, snooping state, querier address and stream receiver path. This step pertains to IGMP snooping L2 multicast receiver control but is not one of the two complementary decisions in this case. The required response and evidence are: Restrict SSH, HTTPS and management VRF exposure and apply individual authenticated administrator roles before enabling remote management. Together with: Check enabled management services by VRF, ACLs, user roles, TLS/SSH settings, logging, NTP and out-of-band recovery. Scenario: A campus engineer exposes the REST API on an unrestricted production data VRF for temporary automation.

Record deliberate changes in running configuration, save the intended startup state and use checkpoints or diffs as an auditable rollback option. This step pertains to AOS-CX configuration save and checkpoint workflow but is not one of the two complementary decisions in this case. The required response and evidence are: Restrict SSH, HTTPS and management VRF exposure and apply individual authenticated administrator roles before enabling remote management. Together with: Check enabled management services by VRF, ACLs, user roles, TLS/SSH settings, logging, NTP and out-of-band recovery. Scenario: A campus engineer exposes the REST API on an unrestricted production data VRF for temporary automation.

Review API role, HTTPS service VRF, TLS validation, token storage, resource responses and request logs. These checks can help with Read-only REST audit and secure token handling, but they are not the most discriminating first evidence here. Examine: Check change owner, impact window, outage dependencies, test plan, rollback threshold and service notification record. Scenario: A data center switch reboot is scheduled during a customer peak without notifying application teams.

Inspect running versus startup configuration, checkpoint inventory, change timestamp and planned rollback commands. These checks can help with AOS-CX configuration save and checkpoint workflow, but they are not the most discriminating first evidence here. Examine: Check change owner, impact window, outage dependencies, test plan, rollback threshold and service notification record. Scenario: A data center switch reboot is scheduled during a customer peak without notifying application teams.

Inspect switch firmware, GET /rest reported versions, authorization, resource URI and response shape. These checks can help with AOS-CX REST API version discovery and compatibility, but they are not the most discriminating first evidence here. Examine: Check change owner, impact window, outage dependencies, test plan, rollback threshold and service notification record. Scenario: A data center switch reboot is scheduled during a customer peak without notifying application teams.

Inspect transceiver identification, Tx/Rx optical levels, fiber connectors, temperature, cable length and port capability. These checks can help with Optic insertion and physical layer preflight, but they are not the most discriminating first evidence here. Examine: Inspect replacement model compatibility, firmware, backup checksum, device identity, port map and management integration. Scenario: A replacement access switch has different port numbering but the team blindly restores old uplink definitions.

Compare firmware, config diffs, CPU/memory, temperature, traffic rates and log markers for the relevant period. These checks can help with Operational state and baseline configuration differences, but they are not the most discriminating first evidence here. Examine: Inspect replacement model compatibility, firmware, backup checksum, device identity, port map and management integration. Scenario: A replacement access switch has different port numbering but the team blindly restores old uplink definitions.

Inspect target resource, writable fields, current object representation, HTTP status, expected diff and checkpoint restore path. These checks can help with Idempotent REST updates and config difference verification, but they are not the most discriminating first evidence here. Examine: Inspect replacement model compatibility, firmware, backup checksum, device identity, port map and management integration. Scenario: A replacement access switch has different port numbering but the team blindly restores old uplink definitions.

Determine whether an access stack, multi-chassis VSX pair or independent routed switch pair best satisfies topology and failure-control objectives. This action instead applies to Resiliency capability evaluation VSX and VSF. VSF presents a logical stack while VSX supports peer coordination with independent control planes on appropriate platforms. It does not directly resolve the controlling requirement. The targeted response is: Turn a wired network design into sequenced change steps with prerequisites, measurable acceptance tests, decision gates and rollback. Scenario: A migration team declares success after link LEDs turn green without testing routed service reachability.

Apply supported access-edge protection such as DHCP snooping, ARP inspection or MAC controls where appropriate and validate trust boundaries. This action instead applies to Port security and DHCP/ARP spoofing defenses. Trusting all access ports undermines spoofing defenses; setting uplink trust without verifying bindings can also disrupt service. It does not directly resolve the controlling requirement. The targeted response is: Turn a wired network design into sequenced change steps with prerequisites, measurable acceptance tests, decision gates and rollback. Scenario: A migration team declares success after link LEDs turn green without testing routed service reachability.

Map HPE Aruba CX access and aggregation switch families to port count, PoE, uplink, redundancy and scale requirements rather than treating every chassis as interchangeable. This action instead applies to Campus access versus aggregation switch portfolio fit. Switch portfolio selection requires platform-specific capability and power-budget verification before selecting a model. It does not directly resolve the controlling requirement. The targeted response is: Turn a wired network design into sequenced change steps with prerequisites, measurable acceptance tests, decision gates and rollback. Scenario: A migration team declares success after link LEDs turn green without testing routed service reachability.

Check active REST API version, authentication mode, target VRF, transaction response, desired diff and audit trail. This step pertains to REST API and configuration-tool integration boundaries but is not one of the two complementary decisions in this case. The required response and evidence are: Assign untagged client access ports and explicitly required tagged VLANs to uplinks using supported AOS-CX VLAN interface modes. Together with: Inspect VLAN inventory, per-interface native versus tagged behavior, allowed VLANs and peer trunk configuration. Scenario: Two trunk peers disagree on native VLAN and management packets enter the wrong broadcast domain.

Subscribers receive expected streams without flooding non-subscribing access ports or triggering avoidable congestion. This step pertains to Multicast flooding and receiver path performance but is not one of the two complementary decisions in this case. The required response and evidence are: Assign untagged client access ports and explicitly required tagged VLANs to uplinks using supported AOS-CX VLAN interface modes. Together with: Inspect VLAN inventory, per-interface native versus tagged behavior, allowed VLANs and peer trunk configuration. Scenario: Two trunk peers disagree on native VLAN and management packets enter the wrong broadcast domain.

Validate route selection, administrative distance or policy and equal-cost path behavior across backup uplinks. This step pertains to OSPF and BGP route preference and ECMP planning but is not one of the two complementary decisions in this case. The required response and evidence are: Assign untagged client access ports and explicitly required tagged VLANs to uplinks using supported AOS-CX VLAN interface modes. Together with: Inspect VLAN inventory, per-interface native versus tagged behavior, allowed VLANs and peer trunk configuration. Scenario: Two trunk peers disagree on native VLAN and management packets enter the wrong broadcast domain.