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The intended switch is visible as managed in the correct Central group with current telemetry and only authorized policy applied. This step pertains to Aruba Central inventory onboarding and assignment but is not one of the two complementary decisions in this case. The required response and evidence are: Build controlled REST configuration changes with preflight GET/diff, approved PUT/PATCH semantics, error handling and postwrite state checks. Together with: Inspect target resource, writable fields, current object representation, HTTP status, expected diff and checkpoint restore path. Scenario: A repeated remediation workflow creates duplicate configuration objects because it never compares desired against existing state.

Compare serials, firmware, management tenant, location, replacement spares, support expiration and asset owner. This step pertains to Inventory and licensing lifecycle control but is not one of the two complementary decisions in this case. The required response and evidence are: Build controlled REST configuration changes with preflight GET/diff, approved PUT/PATCH semantics, error handling and postwrite state checks. Together with: Inspect target resource, writable fields, current object representation, HTTP status, expected diff and checkpoint restore path. Scenario: A repeated remediation workflow creates duplicate configuration objects because it never compares desired against existing state.

Recover a failed AOS-CX switch with supported image, saved configuration, verified physical inventory and secure credential restoration. This step pertains to Backup restoration and replacement switch workflow but is not one of the two complementary decisions in this case. The required response and evidence are: Build controlled REST configuration changes with preflight GET/diff, approved PUT/PATCH semantics, error handling and postwrite state checks. Together with: Inspect target resource, writable fields, current object representation, HTTP status, expected diff and checkpoint restore path. Scenario: A repeated remediation workflow creates duplicate configuration objects because it never compares desired against existing state.

Examine egress buffer occupancy and queue allocation for traffic-class contention rather than interpreting all latency as routing delay. This action instead applies to Packet buffer pressure and head-of-line impact. Buffer pressure reflects contention and bursting; an untested priority adjustment can shift rather than solve loss. It does not directly resolve the controlling requirement. The targeted response is: Trace a host's local IP, mask, gateway and ARP resolution before attributing reachability failure to routing protocols. Scenario: Two hosts on the same VLAN claim the same IP and traffic oscillates between MAC entries.

Classify traffic at supported trust boundaries and map DSCP/802.1p markings into queues consistent with the approved policy. This action instead applies to QoS DSCP trust boundary and class mapping. A QoS marking has no guaranteed effect unless the device trusts, classifies and schedules it as intended. It does not directly resolve the controlling requirement. The targeted response is: Trace a host's local IP, mask, gateway and ARP resolution before attributing reachability failure to routing protocols. Scenario: Two hosts on the same VLAN claim the same IP and traffic oscillates between MAC entries.

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: Trace a host's local IP, mask, gateway and ARP resolution before attributing reachability failure to routing protocols. Scenario: Two hosts on the same VLAN claim the same IP and traffic oscillates between MAC entries.

Use approved MAC authentication or critical-role treatment for devices lacking supplicants with explicit limited privileges and monitoring. This action instead applies to MAC authentication and critical access fallback. MAB is identity based on a spoofable identifier, so its exception path requires narrow permissions and accountability. It does not directly resolve the controlling requirement. The targeted response is: Use least-privilege authenticated REST GET requests to audit switch state and avoid embedding credentials in scripts or logs. Scenario: A read-only REST audit fails because HTTPS was enabled only on an unreachable VRF.

Interpret VSX health, keepalive, ISL, synchronization and active-gateway status before planning peer maintenance. This action instead applies to VSX health telemetry and failover readiness. VSX synchronization status is not equivalent to complete end-to-end forwarding health or upstream route correctness. It does not directly resolve the controlling requirement. The targeted response is: Use least-privilege authenticated REST GET requests to audit switch state and avoid embedding credentials in scripts or logs. Scenario: A read-only REST audit fails because HTTPS was enabled only on an unreachable VRF.

Build controlled REST configuration changes with preflight GET/diff, approved PUT/PATCH semantics, error handling and postwrite state checks. This action instead applies to Idempotent REST updates and config difference verification. Some REST PUT requests can reset omitted attributes to defaults; idempotence requires careful payload and state comparison. It does not directly resolve the controlling requirement. The targeted response is: Use least-privilege authenticated REST GET requests to audit switch state and avoid embedding credentials in scripts or logs. Scenario: A read-only REST audit fails because HTTPS was enabled only on an unreachable VRF.

Classify traffic at supported trust boundaries and map DSCP/802.1p markings into queues consistent with the approved policy. This action instead applies to QoS DSCP trust boundary and class mapping. A QoS marking has no guaranteed effect unless the device trusts, classifies and schedules it as intended. It does not directly resolve the controlling requirement. The targeted response is: Repair LACP member identity or negotiation mismatches on both peers rather than converting a redundant uplink into unmonitored standalone links. Scenario: A maintenance script switches a LAG from active negotiation to incompatible static mode.

Replace only a proven faulty transceiver, cable or interface path with supported parts and validate clean counters afterward. This action instead applies to Optic and port fault replacement strategy. Transceiver swap is justified by Layer 1 evidence and a compatible replacement, not by arbitrary routing failures. It does not directly resolve the controlling requirement. The targeted response is: Repair LACP member identity or negotiation mismatches on both peers rather than converting a redundant uplink into unmonitored standalone links. Scenario: A maintenance script switches a LAG from active negotiation to incompatible static mode.

Restore an OSPF adjacency or missing advertisement using targeted parameter, area or redistribution corrections with route verification. This action instead applies to OSPF route recovery with controlled scope. A broad redistribution change can leak unwanted networks; OSPF repair should target the proven mismatch. It does not directly resolve the controlling requirement. The targeted response is: Repair LACP member identity or negotiation mismatches on both peers rather than converting a redundant uplink into unmonitored standalone links. Scenario: A maintenance script switches a LAG from active negotiation to incompatible static mode.

Check temperature sensors, fan speed alarms, power supply redundancy, PoE consumption and event history. These checks can help with Environmental and power health monitoring, but they are not the most discriminating first evidence here. Examine: Examine site topology, switch count, uplink capacity, failure domains and convergence requirements. Scenario: A branch redesign creates redundant cables but has no documented forwarding or reconvergence behavior.

Review maintenance approval, baselines, device access, console recovery, config backups, support contacts and rollback triggers. These checks can help with Implementation plan preflight and rollback criteria, but they are not the most discriminating first evidence here. Examine: Examine site topology, switch count, uplink capacity, failure domains and convergence requirements. Scenario: A branch redesign creates redundant cables but has no documented forwarding or reconvergence behavior.

Compare signed requirement matrix, design revision, target firmware, selected feature and test result IDs. These checks can help with Requirements-to-configuration traceability matrix, but they are not the most discriminating first evidence here. Examine: Examine site topology, switch count, uplink capacity, failure domains and convergence requirements. Scenario: A branch redesign creates redundant cables but has no documented forwarding or reconvergence behavior.

Include RADIUS, certificate, role assignment, ACL and fallback dependencies in switching deployment sequencing. This action instead applies to Security and authentication migration coordination. Network authentication relies on reachable identity services and policy context that need explicit testing. It does not directly resolve the controlling requirement. The targeted response is: Use the correct AOS-CX interface context and verify administrative state, speed and VLAN mode rather than reusing unrelated switch-vendor syntax. Scenario: A technician configures the uplink on interface 1/1/48 but the physical fiber is on 1/1/47.

Validate port maps, patching, labeling and redundant path diversity as part of physical switch commissioning. This action instead applies to Front-panel and cabling as-built verification. Physical cable mapping is a prerequisite for interpreting adjacency and uplink failover tests correctly. It does not directly resolve the controlling requirement. The targeted response is: Use the correct AOS-CX interface context and verify administrative state, speed and VLAN mode rather than reusing unrelated switch-vendor syntax. Scenario: A technician configures the uplink on interface 1/1/48 but the physical fiber is on 1/1/47.

Coordinate supported VSX peer and downstream MC-LAG connectivity with the core and access design and confirm peer synchronization boundaries. This action instead applies to VSX and aggregation integration verification. VSX peers maintain distinct control planes; inter-switch link and keepalive health require direct monitoring. It does not directly resolve the controlling requirement. The targeted response is: Use the correct AOS-CX interface context and verify administrative state, speed and VLAN mode rather than reusing unrelated switch-vendor syntax. Scenario: A technician configures the uplink on interface 1/1/48 but the physical fiber is on 1/1/47.

Inspect FIB next-hop choices, LAG hashing, flow tuples, interface member counters and return-path routes. These checks can help with Asymmetric path and ECMP hash performance analysis, but they are not the most discriminating first evidence here. Examine: Inspect endpoint lease, L3 interface prefix, ARP table, default route, and duplicate-IP detection logs. Scenario: A workstation with a /16 mask attempts to ARP directly for a remote /24 host that should be routed.

Inspect aggregate state, member operational rates, LACP partner/system IDs, VLAN tags and individual member counters. These checks can help with LACP link aggregation member consistency, but they are not the most discriminating first evidence here. Examine: Inspect endpoint lease, L3 interface prefix, ARP table, default route, and duplicate-IP detection logs. Scenario: A workstation with a /16 mask attempts to ARP directly for a remote /24 host that should be routed.

Inspect interface admin/oper state, optic transmit/receive power, CRC/FCS counters, negotiated speed and neighbor light levels. These checks can help with Physical link failure diagnostics, but they are not the most discriminating first evidence here. Examine: Inspect endpoint lease, L3 interface prefix, ARP table, default route, and duplicate-IP detection logs. Scenario: A workstation with a /16 mask attempts to ARP directly for a remote /24 host that should be routed.

Trace both traffic directions, routing next hops and LAG/ECMP distribution before blaming total switch fabric capacity. This action instead applies to Asymmetric path and ECMP hash performance analysis. A link aggregate distributes by hashes; one elephant flow may not use every available member simultaneously. It does not directly resolve the controlling requirement. The targeted response is: Compare negotiated link speed and error counters to rule out physical bottlenecks before altering QoS or routing. Scenario: A copper access port shows CRC errors when a damaged cable bends near the patch panel.

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: Compare negotiated link speed and error counters to rule out physical bottlenecks before altering QoS or routing. Scenario: A copper access port shows CRC errors when a damaged cable bends near the patch panel.

Roll out switching changes through a representative pilot, dependency validation and site-by-site acceptance instead of an unchecked big-bang change. This action instead applies to Multisite change phasing and blast radius reduction. Staged delivery contains risk and ensures site-specific exceptions are known before full deployment. It does not directly resolve the controlling requirement. The targeted response is: Compare negotiated link speed and error counters to rule out physical bottlenecks before altering QoS or routing. Scenario: A copper access port shows CRC errors when a damaged cable bends near the patch panel.

Review change timeline, configuration diff, backups, affected flows, rollback commands and success criteria. These checks can help with Minimal-change rollback and restoration plan, but they are not the most discriminating first evidence here. Examine: Inspect time source, log severity, event chronology, switch identity, syslog delivery and related config changes. Scenario: A branch switch repeatedly emits link-down events but the central syslog collector has lost connectivity.

Check change owner, impact window, outage dependencies, test plan, rollback threshold and service notification record. These checks can help with Scheduled change window and impact communication, but they are not the most discriminating first evidence here. Examine: Inspect time source, log severity, event chronology, switch identity, syslog delivery and related config changes. Scenario: A branch switch repeatedly emits link-down events but the central syslog collector has lost connectivity.

Examine target release notes, known issues, platform compatibility, upgrade path, image bank and postboot feature tests. These checks can help with Firmware maintenance compatibility and image fallback, but they are not the most discriminating first evidence here. Examine: Inspect time source, log severity, event chronology, switch identity, syslog delivery and related config changes. Scenario: A branch switch repeatedly emits link-down events but the central syslog collector has lost connectivity.

Examine target release notes, known issues, platform compatibility, upgrade path, image bank and postboot feature tests. These checks can help with Firmware maintenance compatibility and image fallback, but they are not the most discriminating first evidence here. Examine: Inspect routing process events, neighbor restart counters, route-table changes, forwarding next hops and convergence timestamps. Scenario: An OSPF peer displays FULL at inspection time despite ten resets during the previous hour.

Inspect alert provenance, affected services, neighbor failures, threshold history and last known change. These checks can help with Troubleshooting evidence dashboard and incident triage, but they are not the most discriminating first evidence here. Examine: Inspect routing process events, neighbor restart counters, route-table changes, forwarding next hops and convergence timestamps. Scenario: An OSPF peer displays FULL at inspection time despite ten resets during the previous hour.

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 routing process events, neighbor restart counters, route-table changes, forwarding next hops and convergence timestamps. Scenario: An OSPF peer displays FULL at inspection time despite ten resets during the previous hour.

Compare installed routing table, OSPF or BGP candidate paths, forwarding next hops and configured preferences. 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: Install supported SFP or QSFP transceivers with matching fiber and validate interface hardware status before making logical protocol changes. Together with: Inspect transceiver identification, Tx/Rx optical levels, fiber connectors, temperature, cable length and port capability. Scenario: An aggregation link repeatedly flaps when one incompatible transceiver is inserted during a campus upgrade.

Validate port maps, patching, labeling and redundant path diversity as part of physical switch commissioning. This step pertains to Front-panel and cabling as-built verification but is not one of the two complementary decisions in this case. The required response and evidence are: Install supported SFP or QSFP transceivers with matching fiber and validate interface hardware status before making logical protocol changes. Together with: Inspect transceiver identification, Tx/Rx optical levels, fiber connectors, temperature, cable length and port capability. Scenario: An aggregation link repeatedly flaps when one incompatible transceiver is inserted during a campus upgrade.

The end-to-end link establishes at the intended speed with acceptable power levels and no unsupported optics alarms. This step pertains to Optical and copper media compatibility but is not one of the two complementary decisions in this case. The required response and evidence are: Install supported SFP or QSFP transceivers with matching fiber and validate interface hardware status before making logical protocol changes. Together with: Inspect transceiver identification, Tx/Rx optical levels, fiber connectors, temperature, cable length and port capability. Scenario: An aggregation link repeatedly flaps when one incompatible transceiver is inserted during a campus upgrade.