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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: Enable supported multicast routing mode and appropriate PIM relationships where stream sources and listeners span routed domains. Together with: Inspect reverse-path forwarding, PIM neighbors, rendezvous-point design if applicable, multicast route state and IGMP memberships. Scenario: A routed multicast tree fails reverse-path forwarding despite reachable source and listener IP addresses.

Inspect root bridge ID, port roles, path cost, MST region consistency and topology change counters. This step pertains to RSTP or MSTP bridge and port role control but is not one of the two complementary decisions in this case. The required response and evidence are: Enable supported multicast routing mode and appropriate PIM relationships where stream sources and listeners span routed domains. Together with: Inspect reverse-path forwarding, PIM neighbors, rendezvous-point design if applicable, multicast route state and IGMP memberships. Scenario: A routed multicast tree fails reverse-path forwarding despite reachable source and listener IP addresses.

Apply edge-port and BPDU protection to endpoint-facing ports, preserving expected behavior on real interswitch links. This step pertains to BPDU guard and edge port hardening but is not one of the two complementary decisions in this case. The required response and evidence are: Enable supported multicast routing mode and appropriate PIM relationships where stream sources and listeners span routed domains. Together with: Inspect reverse-path forwarding, PIM neighbors, rendezvous-point design if applicable, multicast route state and IGMP memberships. Scenario: A routed multicast tree fails reverse-path forwarding despite reachable source and listener IP addresses.

Review model firmware compatibility, known issues, rollback image, maintenance window and regression test plan. These checks can help with Validation-first firmware defect remediation, but they are not the most discriminating first evidence here. Examine: Check group membership entries, IGMP reports, snooping state, querier address and stream receiver path. Scenario: IPTV traffic floods every desk in a VLAN because snooping is disabled or no membership tracking exists.

Inspect Central topology, device status, telemetry collection, event timestamps, access roles and alert forwarding. These checks can help with Aruba Central and switch telemetry integration, but they are not the most discriminating first evidence here. Examine: Check group membership entries, IGMP reports, snooping state, querier address and stream receiver path. Scenario: IPTV traffic floods every desk in a VLAN because snooping is disabled or no membership tracking exists.

Inspect reverse-path forwarding, PIM neighbors, rendezvous-point design if applicable, multicast route state and IGMP memberships. These checks can help with PIM and multicast routed-path validation, but they are not the most discriminating first evidence here. Examine: Check group membership entries, IGMP reports, snooping state, querier address and stream receiver path. Scenario: IPTV traffic floods every desk in a VLAN because snooping is disabled or no membership tracking exists.

Inspect TCP reachability, neighbor remote AS, update source, next hop, accepted/advertised prefixes and policy counters. These checks can help with BGP peer establishment and route policy validation, but they are not the most discriminating first evidence here. Examine: Inspect root bridge ID, port roles, path cost, MST region consistency and topology change counters. Scenario: Two switches in the same MST region use different revision or VLAN mappings and show boundary behavior.

Inspect VLAN inventory, per-interface native versus tagged behavior, allowed VLANs and peer trunk configuration. These checks can help with Access VLAN and trunk allowed-list design, but they are not the most discriminating first evidence here. Examine: Inspect root bridge ID, port roles, path cost, MST region consistency and topology change counters. Scenario: Two switches in the same MST region use different revision or VLAN mappings and show boundary behavior.

Inspect LACP neighbor identity, actor/partner keys, aggregated member state, group configuration and per-member counters. These checks can help with LACP aggregation mismatch investigation, but they are not the most discriminating first evidence here. Examine: Inspect root bridge ID, port roles, path cost, MST region consistency and topology change counters. Scenario: Two switches in the same MST region use different revision or VLAN mappings and show boundary behavior.

Check active REST API version, authentication mode, target VRF, transaction response, desired diff and audit trail. These checks can help with REST API and configuration-tool integration boundaries, but they are not the most discriminating first evidence here. Examine: Inspect Central topology, device status, telemetry collection, event timestamps, access roles and alert forwarding. Scenario: A managed-services dashboard exposes one customer's switch history to another tenant accidentally.

Inspect LACP neighbor identity, actor/partner keys, aggregated member state, group configuration and per-member counters. These checks can help with LACP aggregation mismatch investigation, but they are not the most discriminating first evidence here. Examine: Inspect Central topology, device status, telemetry collection, event timestamps, access roles and alert forwarding. Scenario: A managed-services dashboard exposes one customer's switch history to another tenant accidentally.

Inspect NAD records, authentication source, RADIUS VSAs, role mapping, certificate path and endpoint policy. These checks can help with ClearPass or identity-service policy integration, but they are not the most discriminating first evidence here. Examine: Inspect Central topology, device status, telemetry collection, event timestamps, access roles and alert forwarding. Scenario: A managed-services dashboard exposes one customer's switch history to another tenant accidentally.

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: Check link distance, OM grade or single-mode fiber, optical budget, part support and switch interface rate. Scenario: A network engineer assumes DAC twinax is suitable for a long cross-campus run because it fits the port.

Inspect pilot scope, affected VLANs, critical service hours, change batches, spare equipment and rollback readiness. These checks can help with Multisite change phasing and blast radius reduction, but they are not the most discriminating first evidence here. Examine: Check link distance, OM grade or single-mode fiber, optical budget, part support and switch interface rate. Scenario: A network engineer assumes DAC twinax is suitable for a long cross-campus run because it fits the port.

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: Check link distance, OM grade or single-mode fiber, optical budget, part support and switch interface rate. Scenario: A network engineer assumes DAC twinax is suitable for a long cross-campus run because it fits the port.

Endpoints retain gateway reachability when one supported gateway member is taken offline in a controlled test. This result is associated with VRRP or active gateway redundant gateway behavior; it does not demonstrate the requested network behavior. The relevant acceptance test is: Priority endpoints receive stable power without oversubscription during peak endpoint startup. Scenario: A line-card installation increases the PoE demand beyond the remaining supply reserve.

New sites integrate without duplicate addresses, unintended route leakage or VLAN ambiguity. This result is associated with IP addressing and VLAN numbering plan; it does not demonstrate the requested network behavior. The relevant acceptance test is: Priority endpoints receive stable power without oversubscription during peak endpoint startup. Scenario: A line-card installation increases the PoE demand beyond the remaining supply reserve.

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: Priority endpoints receive stable power without oversubscription during peak endpoint startup. Scenario: A line-card installation increases the PoE demand beyond the remaining supply reserve.

Replacement hardware restores planned endpoint and uplink services without inheriting stale secrets or wrong location settings. This result is associated with Backup restoration and replacement switch workflow; it does not demonstrate the requested network behavior. The relevant acceptance test is: The changed variable responsible for a regression is identified or explicitly ruled out with measurable evidence. Scenario: One switch reports high CPU after a logging agent update and the incident report ignores change timestamps.

State and configuration are inventoried accurately while unauthorized write requests are denied and secrets stay protected. This result is associated with Read-only REST audit and secure token handling; it does not demonstrate the requested network behavior. The relevant acceptance test is: The changed variable responsible for a regression is identified or explicitly ruled out with measurable evidence. Scenario: One switch reports high CPU after a logging agent update and the incident report ignores change timestamps.

Priority traffic improves at congestion without silently starving business-critical bulk services. This result is associated with QoS classification repair with before/after measures; it does not demonstrate the requested network behavior. The relevant acceptance test is: The changed variable responsible for a regression is identified or explicitly ruled out with measurable evidence. Scenario: One switch reports high CPU after a logging agent update and the incident report ignores change timestamps.

A tested change survives the intended restart while an approved rollback restores the previous known-good configuration. This result is associated with AOS-CX configuration save and checkpoint workflow; it does not demonstrate the requested network behavior. The relevant acceptance test is: The missing VLAN forwards across the uplink while guest and management VLANs remain isolated. Scenario: An engineer proposes permitting all 4094 VLANs on the trunk to solve one missing voice VLAN.

A reproducible impairment is separated from a monitoring artifact with corrected alert thresholds or source data. This result is associated with Telemetry false-positive and baseline drift analysis; it does not demonstrate the requested network behavior. The relevant acceptance test is: The missing VLAN forwards across the uplink while guest and management VLANs remain isolated. Scenario: An engineer proposes permitting all 4094 VLANs on the trunk to solve one missing voice VLAN.

The affected class receives measured queue improvement under load with unrelated classes remaining usable. This result is associated with Packet buffer pressure and head-of-line impact; it does not demonstrate the requested network behavior. The relevant acceptance test is: The missing VLAN forwards across the uplink while guest and management VLANs remain isolated. Scenario: An engineer proposes permitting all 4094 VLANs on the trunk to solve one missing voice VLAN.

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: Use supported Network Analytics Engine monitors and rules to correlate switch database state with alerts and historical graphs. Scenario: A threshold monitor floods operations with alarms whenever normal nightly backups run.

Attribute application loss to the actual congested egress queue and traffic class rather than only interface-level packet drops. This action instead applies to QoS queue drop root cause under congestion. Interface error counters can remain zero while egress queues discard packets during oversubscription. It does not directly resolve the controlling requirement. The targeted response is: Use supported Network Analytics Engine monitors and rules to correlate switch database state with alerts and historical graphs. Scenario: A threshold monitor floods operations with alarms whenever normal nightly backups run.

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: Use supported Network Analytics Engine monitors and rules to correlate switch database state with alerts and historical graphs. Scenario: A threshold monitor floods operations with alarms whenever normal nightly backups run.

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 high-frequency interface and queue evidence to distinguish short microbursts from sustained bandwidth saturation. Scenario: A storage application briefly transmits line-rate bursts through a lower-rate uplink and buffers overflow.

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: Use high-frequency interface and queue evidence to distinguish short microbursts from sustained bandwidth saturation. Scenario: A storage application briefly transmits line-rate bursts through a lower-rate uplink and buffers overflow.

Configure matching OSPF neighbor parameters, interfaces and area membership, then check route learning after adjacency forms. This action instead applies to OSPF adjacency and area configuration. OSPF routing needs compatible neighbor settings and valid route advertisement, not simply enabled routing processes. It does not directly resolve the controlling requirement. The targeted response is: Use high-frequency interface and queue evidence to distinguish short microbursts from sustained bandwidth saturation. Scenario: A storage application briefly transmits line-rate bursts through a lower-rate uplink and buffers overflow.

Inspect process CPU over time, event logs, topology change rate, protocol adjacency resets and agent schedules. These checks can help with High CPU and control-plane protocol churn, but they are not the most discriminating first evidence here. Examine: Inspect boot logs, DHCP options, name resolution, management addressing, port VLAN, service accessibility and registration state. Scenario: A factory-reset device arrives on a network whose management VLAN cannot reach cloud onboarding services.

Inspect RADIUS server reachability/secret, authentication session state, EAP exchange, assigned role and rejection logs. These checks can help with 802.1X and RADIUS port authentication, but they are not the most discriminating first evidence here. Examine: Inspect boot logs, DHCP options, name resolution, management addressing, port VLAN, service accessibility and registration state. Scenario: A factory-reset device arrives on a network whose management VLAN cannot reach cloud onboarding services.

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 boot logs, DHCP options, name resolution, management addressing, port VLAN, service accessibility and registration state. Scenario: A factory-reset device arrives on a network whose management VLAN cannot reach cloud onboarding services.