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Permitted devices authenticate into approved access profiles while failed authentication has defined limited access. This step pertains to 802.1X and RADIUS port authentication 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 bulk script treats HTTP 200 as proof the active VLAN is forwarding, without checking the port state.

Use least-privilege authenticated REST GET requests to audit switch state and avoid embedding credentials in scripts or logs. This step pertains to Read-only REST audit and secure token handling 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 bulk script treats HTTP 200 as proof the active VLAN is forwarding, without checking the port state.

Inspect switch firmware, GET /rest reported versions, authorization, resource URI and response shape. This step pertains to AOS-CX REST API version discovery and compatibility 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 bulk script treats HTTP 200 as proof the active VLAN is forwarding, without checking the port state.

Create a consistent VLAN ID, SVI subnet, gateway and routing-domain matrix avoiding overlaps and unintended spanning. This action instead applies to IP addressing and VLAN numbering plan. A clearly documented IP/VLAN plan avoids collision and prevents a VLAN label from standing in for an L3 policy. It does not directly resolve the controlling requirement. The targeted response is: Schedule VLAN creation, trunk allowance, SVI services and routing prerequisites before switching live endpoint traffic. Scenario: A site activates new routed gateways without checking upstream return routes.

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: Schedule VLAN creation, trunk allowance, SVI services and routing prerequisites before switching live endpoint traffic. Scenario: A site activates new routed gateways without checking upstream return routes.

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: Schedule VLAN creation, trunk allowance, SVI services and routing prerequisites before switching live endpoint traffic. Scenario: A site activates new routed gateways without checking upstream return routes.

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 minor interface renumbering inadvertently disconnects an emergency paging VLAN that was omitted from impact review.

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: Check change owner, impact window, outage dependencies, test plan, rollback threshold and service notification record. Scenario: A minor interface renumbering inadvertently disconnects an emergency paging VLAN that was omitted from impact review.

Inspect local/peer trunk configuration, permitted VLAN list, MAC learning and DHCP/gateway tests. These checks can help with Correct trunk VLAN remediation, 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 minor interface renumbering inadvertently disconnects an emergency paging VLAN that was omitted from impact review.

Use IGMP snooping and a suitable querier or routed multicast context to constrain multicast replication to interested ports. This action instead applies to IGMP snooping L2 multicast receiver control. IGMP snooping relies on correct membership signaling and appropriate querier behavior; static VLAN existence is insufficient. It does not directly resolve the controlling requirement. The targeted response is: Enable supported multicast routing mode and appropriate PIM relationships where stream sources and listeners span routed domains. Scenario: Operators configure IGMP snooping only and expect multicast to cross L3 VLAN interfaces automatically.

Use sensor, PSU, fan and PoE state to identify hardware conditions that threaten switching service continuity. This action instead applies to Environmental and power health monitoring. Environmental alarms can cause service degradation even when interface and routing configurations have not changed. It does not directly resolve the controlling requirement. The targeted response is: Enable supported multicast routing mode and appropriate PIM relationships where stream sources and listeners span routed domains. Scenario: Operators configure IGMP snooping only and expect multicast to cross L3 VLAN interfaces automatically.

Install supported SFP or QSFP transceivers with matching fiber and validate interface hardware status before making logical protocol changes. This action instead applies to Optic insertion and physical layer preflight. Optical mismatch or contamination should be isolated at Layer 1 before changing VLAN or routing state. It does not directly resolve the controlling requirement. The targeted response is: Enable supported multicast routing mode and appropriate PIM relationships where stream sources and listeners span routed domains. Scenario: Operators configure IGMP snooping only and expect multicast to cross L3 VLAN interfaces automatically.

Onboard a supported AOS-CX switch to the approved Aruba Central tenant, inventory and group with valid subscription and reachability before pushing managed configuration. 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: Apply group-level switching policies only after confirming device model compatibility and whether the site is UI-group or template-group managed. Together with: Review Central group type, effective configuration, variable bindings, supported template syntax and local override restrictions. Scenario: A Central group change aimed at one shop accidentally modifies every branch because variable scoping was not checked.

Transient path failures are detected and recovery times are verified against the campus or WAN design goal. This step pertains to Routing adjacency and convergence telemetry interpretation but is not one of the two complementary decisions in this case. The required response and evidence are: Apply group-level switching policies only after confirming device model compatibility and whether the site is UI-group or template-group managed. Together with: Review Central group type, effective configuration, variable bindings, supported template syntax and local override restrictions. Scenario: A Central group change aimed at one shop accidentally modifies every branch because variable scoping was not checked.

Inspect boot logs, DHCP options, name resolution, management addressing, port VLAN, service accessibility and registration state. This step pertains to ZTP bootstrapping and management plane reachability but is not one of the two complementary decisions in this case. The required response and evidence are: Apply group-level switching policies only after confirming device model compatibility and whether the site is UI-group or template-group managed. Together with: Review Central group type, effective configuration, variable bindings, supported template syntax and local override restrictions. Scenario: A Central group change aimed at one shop accidentally modifies every branch because variable scoping was not checked.

Trace a host's local IP, mask, gateway and ARP resolution before attributing reachability failure to routing protocols. This action instead applies to IP addressing subnet and gateway mismatch. Incorrect subnet or default gateway settings can break connectivity even while VLAN forwarding remains healthy. It does not directly resolve the controlling requirement. The targeted response is: Separate OSPF adjacency failure from absent advertised prefixes by inspecting both neighbor state and routing tables. Scenario: A branch OSPF neighbor sticks in EXSTART after an MTU change on one side.

Differentiate a legitimate redundant STP blocked port from a physical link failure or topology loop using bridge-state evidence. This action instead applies to STP blocking and topology-loop recognition. STP discards some redundant paths by design; unexpected topology changes and MAC moves suggest a separate fault. It does not directly resolve the controlling requirement. The targeted response is: Separate OSPF adjacency failure from absent advertised prefixes by inspecting both neighbor state and routing tables. Scenario: A branch OSPF neighbor sticks in EXSTART after an MTU change on one side.

Install supported SFP or QSFP transceivers with matching fiber and validate interface hardware status before making logical protocol changes. This action instead applies to Optic insertion and physical layer preflight. Optical mismatch or contamination should be isolated at Layer 1 before changing VLAN or routing state. It does not directly resolve the controlling requirement. The targeted response is: Separate OSPF adjacency failure from absent advertised prefixes by inspecting both neighbor state and routing tables. Scenario: A branch OSPF neighbor sticks in EXSTART after an MTU change on one side.

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: Identify whether excessive routing updates, loop events or monitoring jobs are consuming CPU and affecting network stability. Scenario: OSPF neighbors flap during a periodic CPU spike after an over-aggressive polling integration is deployed.

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: Identify whether excessive routing updates, loop events or monitoring jobs are consuming CPU and affecting network stability. Scenario: OSPF neighbors flap during a periodic CPU spike after an over-aggressive polling integration is deployed.

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: Identify whether excessive routing updates, loop events or monitoring jobs are consuming CPU and affecting network stability. Scenario: OSPF neighbors flap during a periodic CPU spike after an over-aggressive polling integration is deployed.

Trace both traffic directions, routing next hops and LAG/ECMP distribution before blaming total switch fabric capacity. This step pertains to Asymmetric path and ECMP hash performance analysis but is not one of the two complementary decisions in this case. The required response and evidence are: Form a remediation sequence from observed baseline, known-good checkpoint, expected impact and verification steps rather than changing multiple controls at once. Together with: Review change timeline, configuration diff, backups, affected flows, rollback commands and success criteria. Scenario: A customer reports lost connectivity immediately after an ACL push and no one has compared checkpoint diffs.

The installed equipment maintains acceptable temperature and power redundancy, with recoverable console access. This step pertains to Physical installation and rack power implementation but is not one of the two complementary decisions in this case. The required response and evidence are: Form a remediation sequence from observed baseline, known-good checkpoint, expected impact and verification steps rather than changing multiple controls at once. Together with: Review change timeline, configuration diff, backups, affected flows, rollback commands and success criteria. Scenario: A customer reports lost connectivity immediately after an ACL push and no one has compared checkpoint diffs.

Inspect LACP neighbor identity, actor/partner keys, aggregated member state, group configuration and per-member counters. This step pertains to LACP aggregation mismatch investigation but is not one of the two complementary decisions in this case. The required response and evidence are: Form a remediation sequence from observed baseline, known-good checkpoint, expected impact and verification steps rather than changing multiple controls at once. Together with: Review change timeline, configuration diff, backups, affected flows, rollback commands and success criteria. Scenario: A customer reports lost connectivity immediately after an ACL push and no one has compared checkpoint diffs.

Use least-privilege authenticated REST GET requests to audit switch state and avoid embedding credentials in scripts or logs. This action instead applies to Read-only REST audit and secure token handling. Read-only audits do not need broad write permission and successful connection does not imply every requested resource exists. It does not directly resolve the controlling requirement. The targeted response is: Monitor authentication success ratios, rejected sessions, policy role assignment and known exception endpoints by switch/site. Scenario: An IoT rollout shows high authentication success yet devices still receive a restricted quarantine role.

Restrict SSH, HTTPS and management VRF exposure and apply individual authenticated administrator roles before enabling remote management. This action instead applies to AOS-CX secure management access setup. Secure management requires both service availability and scoped authorization; turning on HTTPS on every VRF is not a required convenience. It does not directly resolve the controlling requirement. The targeted response is: Monitor authentication success ratios, rejected sessions, policy role assignment and known exception endpoints by switch/site. Scenario: An IoT rollout shows high authentication success yet devices still receive a restricted quarantine role.

Compare deployed AOS-CX configurations against approved Aruba Central templates or version-controlled intended state and record exceptions. This action instead applies to Centralized configuration drift audit. A device can be online in a management console while local configuration has drifted from the governed baseline. It does not directly resolve the controlling requirement. The targeted response is: Monitor authentication success ratios, rejected sessions, policy role assignment and known exception endpoints by switch/site. Scenario: An IoT rollout shows high authentication success yet devices still receive a restricted quarantine role.

Turn a wired network design into sequenced change steps with prerequisites, measurable acceptance tests, decision gates and rollback. This step pertains to Implementation plan preflight and rollback criteria but is not one of the two complementary decisions in this case. The required response and evidence are: Reconcile the approved design with actual interfaces, optics, firmware, cable labels and final switch configurations after deployment. Together with: Compare installation photos, running and startup configs, topology neighbors, asset inventory and exception log. Scenario: A field team swaps transceivers due to a fiber limitation but leaves the design's part numbers unchanged.

Priority traffic improves at congestion without silently starving business-critical bulk services. This step pertains to QoS classification repair with before/after measures but is not one of the two complementary decisions in this case. The required response and evidence are: Reconcile the approved design with actual interfaces, optics, firmware, cable labels and final switch configurations after deployment. Together with: Compare installation photos, running and startup configs, topology neighbors, asset inventory and exception log. Scenario: A field team swaps transceivers due to a fiber limitation but leaves the design's part numbers unchanged.

Compare signed requirement matrix, design revision, target firmware, selected feature and test result IDs. This step pertains to Requirements-to-configuration traceability matrix but is not one of the two complementary decisions in this case. The required response and evidence are: Reconcile the approved design with actual interfaces, optics, firmware, cable labels and final switch configurations after deployment. Together with: Compare installation photos, running and startup configs, topology neighbors, asset inventory and exception log. Scenario: A field team swaps transceivers due to a fiber limitation but leaves the design's part numbers unchanged.

Inspect serial and MAC claim, subscription, tenant organization, management network DNS/TLS/NTP and switch connectivity to Central. These checks can help with Aruba Central inventory onboarding and assignment, 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: After a core hardware failure, operations can find archives but cannot authenticate to the replacement device.

Review archive permissions, encryption state, retention policy, sensitive fields, backup audit trail and restore rights. These checks can help with Safe configuration archiving and secret handling, 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: After a core hardware failure, operations can find archives but cannot authenticate to the replacement device.

Inspect checkpoint inventory, startup/running diff, saved exports, backup location, device-specific recovery instructions and access permissions. These checks can help with Configuration checkpoint and rollback retention, 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: After a core hardware failure, operations can find archives but cannot authenticate to the replacement device.