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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 active configuration context, interface name, running configuration, link state, peer capabilities and software help. Scenario: An operator pastes legacy switch CLI for a trunk and AOS-CX rejects or misinterprets it.

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 active configuration context, interface name, running configuration, link state, peer capabilities and software help. Scenario: An operator pastes legacy switch CLI for a trunk and AOS-CX rejects or misinterprets it.

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 active configuration context, interface name, running configuration, link state, peer capabilities and software help. Scenario: An operator pastes legacy switch CLI for a trunk and AOS-CX rejects or misinterprets it.

Inspect polling interval, baseline trend, telemetry collection gaps, alert configuration and correlated switch counters. These checks can help with Telemetry false-positive and baseline drift analysis, but they are not the most discriminating first evidence here. Examine: Inspect RADIUS server reachability/secret, authentication session state, EAP exchange, assigned role and rejection logs. Scenario: A finance laptop has link up but remains unauthorized because RADIUS traffic is blocked on the management path.

Review traffic direction, rate limits, burst settings, platform QoS resources and class-of-service monitoring. These checks can help with Ingress policing versus egress shaping design, but they are not the most discriminating first evidence here. Examine: Inspect RADIUS server reachability/secret, authentication session state, EAP exchange, assigned role and rejection logs. Scenario: A finance laptop has link up but remains unauthorized because RADIUS traffic is blocked on the management path.

Check actual watt draw, negotiated 802.3af/at/bt class, switch budget, PSU status and power priorities. These checks can help with Power and PoE field commissioning, but they are not the most discriminating first evidence here. Examine: Inspect RADIUS server reachability/secret, authentication session state, EAP exchange, assigned role and rejection logs. Scenario: A finance laptop has link up but remains unauthorized because RADIUS traffic is blocked on the management path.

Routes appear only in intended tables and traffic shifts correctly after failure with no prolonged black hole. This step pertains to Routing and convergence implementation gates but is not one of the two complementary decisions in this case. The required response and evidence are: Locate excess multicast replication or lost group membership using IGMP/PIM state and per-port traffic evidence. Together with: Inspect multicast group forwarding table, membership timers, querier identity, PIM RPF path and interface counters. Scenario: A remote video receiver receives no stream after a routing change breaks PIM's reverse-path check.

Review change timeline, configuration diff, backups, affected flows, rollback commands and success criteria. This step pertains to Minimal-change rollback and restoration plan but is not one of the two complementary decisions in this case. The required response and evidence are: Locate excess multicast replication or lost group membership using IGMP/PIM state and per-port traffic evidence. Together with: Inspect multicast group forwarding table, membership timers, querier identity, PIM RPF path and interface counters. Scenario: A remote video receiver receives no stream after a routing change breaks PIM's reverse-path check.

Identify whether excessive routing updates, loop events or monitoring jobs are consuming CPU and affecting network stability. This step pertains to High CPU and control-plane protocol churn but is not one of the two complementary decisions in this case. The required response and evidence are: Locate excess multicast replication or lost group membership using IGMP/PIM state and per-port traffic evidence. Together with: Inspect multicast group forwarding table, membership timers, querier identity, PIM RPF path and interface counters. Scenario: A remote video receiver receives no stream after a routing change breaks PIM's reverse-path check.

Examine RADIUS response categories, endpoint identity, effective user role, switch port and historical attempts. These checks can help with Client authentication and port-role operational reports, but they are not the most discriminating first evidence here. Examine: 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 OSPF or BGP peer parameters, VRFs, route policies, prefix tables and expected reconvergence time. These checks can help with Routing and convergence implementation gates, but they are not the most discriminating first evidence here. Examine: 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.

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: 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.

Check actual watt draw, negotiated 802.3af/at/bt class, switch budget, PSU status and power priorities. These checks can help with Power and PoE field commissioning, but they are not the most discriminating first evidence here. Examine: Check powered endpoints, PoE class, uplink optics, stack or VSX requirements, interfaces and supported software for candidate models. Scenario: A branch closet needs 48 powered telephones and two high-capacity fiber uplinks but the proposed compact switch has an inadequate PoE budget.

Inspect allowed VLAN lists, IP plans, gateway addresses, routes and dependency owners at each change stage. These checks can help with Dependency ordering for VLAN and routed cutovers, but they are not the most discriminating first evidence here. Examine: Check powered endpoints, PoE class, uplink optics, stack or VSX requirements, interfaces and supported software for candidate models. Scenario: A branch closet needs 48 powered telephones and two high-capacity fiber uplinks but the proposed compact switch has an inadequate PoE budget.

Compare slot inventory, supported modules, forwarding capacity, supervisor architecture, footprint, and lifecycle support. These checks can help with Modular core chassis versus fixed form factor, but they are not the most discriminating first evidence here. Examine: Check powered endpoints, PoE class, uplink optics, stack or VSX requirements, interfaces and supported software for candidate models. Scenario: A branch closet needs 48 powered telephones and two high-capacity fiber uplinks but the proposed compact switch has an inadequate PoE budget.

Use separate VRFs for management, corporate, and guest routing where specified, with explicit approved inter-VRF connectivity. This action instead applies to VRF isolation and controlled route leaking. VRFs separate routing tables, but they do not replace security policy on deliberately interconnected services. It does not directly resolve the controlling requirement. The targeted response is: Calculate access ports, PoE classes and spare uplink capacity from endpoint inventory and growth rather than ordering by current occupied ports alone. Scenario: A campus refresh overlooks a planned move from one-gigabit edge ports to multi-gigabit wireless uplinks.

Size distributed or collapsed core switching based on site scale, resilient paths, routed boundaries and maintenance windows. This action instead applies to Branch distribution and collapse-core topology selection. Topology choice should follow the failure and growth profile, not simply replicate a large-campus diagram at every site. It does not directly resolve the controlling requirement. The targeted response is: Calculate access ports, PoE classes and spare uplink capacity from endpoint inventory and growth rather than ordering by current occupied ports alone. Scenario: A campus refresh overlooks a planned move from one-gigabit edge ports to multi-gigabit wireless uplinks.

Choose modular switching when high-density interface growth, supervisor resilience and replaceable modules justify chassis architecture; choose fixed models only when they satisfy measured needs. This action instead applies to Modular core chassis versus fixed form factor. A modular chassis addresses scale and serviceability needs that are not conferred by a product's nominal port speed alone. It does not directly resolve the controlling requirement. The targeted response is: Calculate access ports, PoE classes and spare uplink capacity from endpoint inventory and growth rather than ordering by current occupied ports alone. Scenario: A campus refresh overlooks a planned move from one-gigabit edge ports to multi-gigabit wireless uplinks.

Examine RADIUS response categories, endpoint identity, effective user role, switch port and historical attempts. These checks can help with Client authentication and port-role operational reports, but they are not the most discriminating first evidence here. Examine: Check root bridge ID, port role/state, BPDU activity, topology change count and MAC instability. Scenario: A standby trunk appears blocking in STP and an operator declares it failed without checking topology.

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 root bridge ID, port role/state, BPDU activity, topology change count and MAC instability. Scenario: A standby trunk appears blocking in STP and an operator declares it failed without checking topology.

Inspect per-VRF interface ownership, route table, import/export controls and packet path security enforcement. These checks can help with VRF and route-leak correction, but they are not the most discriminating first evidence here. Examine: Check root bridge ID, port role/state, BPDU activity, topology change count and MAC instability. Scenario: A standby trunk appears blocking in STP and an operator declares it failed without checking topology.

Inspect server status, shared secret, policy decision, client identity, session logs and effective role. This step pertains to Authentication and RADIUS remediation discipline but is not one of the two complementary decisions in this case. The required response and evidence are: Trace a host's local IP, mask, gateway and ARP resolution before attributing reachability failure to routing protocols. Together with: 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.

Separate OSPF adjacency failure from absent advertised prefixes by inspecting both neighbor state and routing tables. This step pertains to OSPF neighbor and route missing root cause but is not one of the two complementary decisions in this case. The required response and evidence are: Trace a host's local IP, mask, gateway and ARP resolution before attributing reachability failure to routing protocols. Together with: 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.

A failed pilot is isolated to its site, while later sites receive corrected runbooks and signed approval. This step pertains to Multisite change phasing and blast radius reduction but is not one of the two complementary decisions in this case. The required response and evidence are: Trace a host's local IP, mask, gateway and ARP resolution before attributing reachability failure to routing protocols. Together with: 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.

Map every customer requirement to an implementation control, validation evidence, accountable owner and acceptable failure behavior. This action instead applies to Requirements-to-configuration traceability matrix. A checklist of completed CLI commands is not proof that the business service objectives were met. It does not directly resolve the controlling requirement. The targeted response is: Determine whether an access stack, multi-chassis VSX pair or independent routed switch pair best satisfies topology and failure-control objectives. Scenario: Two switches are described as redundant even though their required peer links and keepalive paths were never planned.

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: Determine whether an access stack, multi-chassis VSX pair or independent routed switch pair best satisfies topology and failure-control objectives. Scenario: Two switches are described as redundant even though their required peer links and keepalive paths were never planned.

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: Determine whether an access stack, multi-chassis VSX pair or independent routed switch pair best satisfies topology and failure-control objectives. Scenario: Two switches are described as redundant even though their required peer links and keepalive paths were never planned.

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: Check VLAN active members, SVI IP prefix, routing state, VRF membership, connected routes and ARP/ND entries. Scenario: An upstream routed link is left in the wrong VRF so connected prefixes do not enter the intended routing table.

Check group membership entries, IGMP reports, snooping state, querier address and stream receiver path. These checks can help with IGMP snooping L2 multicast receiver control, but they are not the most discriminating first evidence here. Examine: Check VLAN active members, SVI IP prefix, routing state, VRF membership, connected routes and ARP/ND entries. Scenario: An upstream routed link is left in the wrong VRF so connected prefixes do not enter the intended routing table.

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: Check VLAN active members, SVI IP prefix, routing state, VRF membership, connected routes and ARP/ND entries. Scenario: An upstream routed link is left in the wrong VRF so connected prefixes do not enter the intended routing table.

Use LLDP neighbor data and interface inventories to verify connected peers and document the physical campus topology. This action instead applies to LLDP topology and neighbor mapping. LLDP is discovery evidence but neighbor advertisements do not prove the entire end-to-end forwarding path is authorized. It does not directly resolve the controlling requirement. The targeted response is: Differentiate RADIUS latency and repeated endpoint authentication churn from application packet loss or physical interface faults. Scenario: A disconnected identity service causes hundreds of access switches to retry with synchronized timeouts.

Use per-hop VLAN and trunk inspection to locate an endpoint broadcast domain missing from the authorized path. This action instead applies to VLAN ID mismatch and trunk omission. An end station can show link up while its VLAN is missing or differently tagged on an upstream segment. It does not directly resolve the controlling requirement. The targeted response is: Differentiate RADIUS latency and repeated endpoint authentication churn from application packet loss or physical interface faults. Scenario: A disconnected identity service causes hundreds of access switches to retry with synchronized timeouts.

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: Differentiate RADIUS latency and repeated endpoint authentication churn from application packet loss or physical interface faults. Scenario: A disconnected identity service causes hundreds of access switches to retry with synchronized timeouts.