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That control reduces a separate risk: The LAN uses the failed router's physical gateway address instead of a protected FHRP virtual gateway. For the described design, the recurring risk arises from: the standby supervisor is not in the required ready/synchronized state for SSO. The specific required safeguard is: monitor supervisor redundancy state and software version compatibility before maintenance.

That control reduces a separate risk: The intended core transit tier was omitted, producing accidental distribution-to-distribution dependence. For the described design, the recurring risk arises from: the standby supervisor is not in the required ready/synchronized state for SSO. The specific required safeguard is: monitor supervisor redundancy state and software version compatibility before maintenance.

That control reduces a separate risk: The redundant cabling did not remove the common upstream hardware failure domain. For the described design, the recurring risk arises from: the standby supervisor is not in the required ready/synchronized state for SSO. The specific required safeguard is: monitor supervisor redundancy state and software version compatibility before maintenance.

Using a three-tier access, distribution and core architecture to separate campus aggregation from backbone transit would not plan dual-stack IPv4/IPv6 addressing.

Connecting each leaf to multiple spines with routed equal-cost reachability and appropriate endpoint routing would not plan dual-stack IPv4/IPv6 addressing.

Deploying a supported FHRP virtual gateway with correctly coordinated member roles and interface reachability would not plan dual-stack IPv4/IPv6 addressing.

This test measures a different behavior: Check equal-cost FIB entries and forwarding under loss of one spine-facing link. It does not establish the target outcome. For the documented fault, the direct acceptance test is: test the legacy IPv4-only client against the cloud IPv4 listener and a dual-stack peer against the application IPv6 listener.

This test measures a different behavior: Trace a packet from an access VLAN through its distribution block to a redundant core path without crossing an unrelated access switch. It does not establish the target outcome. For the documented fault, the direct acceptance test is: test the legacy IPv4-only client against the cloud IPv4 listener and a dual-stack peer against the application IPv6 listener.

This test measures a different behavior: Observe the virtual gateway ownership move and successful client traffic when the active gateway loses LAN reachability. It does not establish the target outcome. For the documented fault, the direct acceptance test is: test the legacy IPv4-only client against the cloud IPv4 listener and a dual-stack peer against the application IPv6 listener.

That diagnosis is supported by a different symptom: Clients retain a reachable physical switch but cannot reach their default gateway after the active router fails. Here the recorded observation is: iPv4-only clients work, but IPv6-capable hosts fail to reach the dual-stack cloud service over IPv6. The applicable cause is: iPv6 addresses or routes are missing on at least one required hop; IPv4 reachability does not automatically deliver IPv6 traffic.

That diagnosis is supported by a different symptom: A new distribution block must transit another distribution switch to reach remote buildings. Here the recorded observation is: iPv4-only clients work, but IPv6-capable hosts fail to reach the dual-stack cloud service over IPv6. The applicable cause is: iPv6 addresses or routes are missing on at least one required hop; IPv4 reachability does not automatically deliver IPv6 traffic.

That diagnosis is supported by a different symptom: A fabric leaf isolates attached workloads whenever its sole spine-facing physical uplink fails. Here the recorded observation is: iPv4-only clients work, but IPv6-capable hosts fail to reach the dual-stack cloud service over IPv6. The applicable cause is: iPv6 addresses or routes are missing on at least one required hop; IPv4 reachability does not automatically deliver IPv6 traffic.

That control reduces a separate risk: The intended core transit tier was omitted, producing accidental distribution-to-distribution dependence. For the described design, the recurring risk arises from: iPv6 addresses or routes are missing on at least one required hop; IPv4 reachability does not automatically deliver IPv6 traffic. The specific required safeguard is: validate IPv4 and IPv6 reachability and security policies independently after routing or cloud network changes.

That control reduces a separate risk: The LAN uses the failed router's physical gateway address instead of a protected FHRP virtual gateway. For the described design, the recurring risk arises from: iPv6 addresses or routes are missing on at least one required hop; IPv4 reachability does not automatically deliver IPv6 traffic. The specific required safeguard is: validate IPv4 and IPv6 reachability and security policies independently after routing or cloud network changes.

That control reduces a separate risk: The leaf has a single spine failure domain instead of independent fabric uplinks. For the described design, the recurring risk arises from: iPv6 addresses or routes are missing on at least one required hop; IPv4 reachability does not automatically deliver IPv6 traffic. The specific required safeguard is: validate IPv4 and IPv6 reachability and security policies independently after routing or cloud network changes.

Planning dual-stack IPv4/IPv6 addressing would not connect each leaf to multiple spines with routed equal-cost reachability and appropriate endpoint routing.

Placing uplinks across independent forwarding or chassis failure domains would not connect each leaf to multiple spines with routed equal-cost reachability and appropriate endpoint routing.

Using a three-tier access, distribution and core architecture to separate campus aggregation from backbone transit would not connect each leaf to multiple spines with routed equal-cost reachability and appropriate endpoint routing.

This test measures a different behavior: Inspect physical device and slot assignments and disable one forwarding component to check whether a second path survives. It does not establish the target outcome. For the documented fault, the direct acceptance test is: check equal-cost FIB entries and forwarding under loss of one spine-facing link.

This test measures a different behavior: Test the legacy IPv4-only client against the cloud IPv4 listener and a dual-stack peer against the application IPv6 listener. It does not establish the target outcome. For the documented fault, the direct acceptance test is: check equal-cost FIB entries and forwarding under loss of one spine-facing link.

This test measures a different behavior: Trace a packet from an access VLAN through its distribution block to a redundant core path without crossing an unrelated access switch. It does not establish the target outcome. For the documented fault, the direct acceptance test is: check equal-cost FIB entries and forwarding under loss of one spine-facing link.

That diagnosis is supported by a different symptom: A new distribution block must transit another distribution switch to reach remote buildings. Here the recorded observation is: a fabric leaf isolates attached workloads whenever its sole spine-facing physical uplink fails. The applicable cause is: the leaf has a single spine failure domain instead of independent fabric uplinks.

That diagnosis is supported by a different symptom: Both logical uplinks fail when a single supervisor/line-card component is removed. Here the recorded observation is: a fabric leaf isolates attached workloads whenever its sole spine-facing physical uplink fails. The applicable cause is: the leaf has a single spine failure domain instead of independent fabric uplinks.

That diagnosis is supported by a different symptom: IPv4-only clients work, but IPv6-capable hosts fail to reach the dual-stack cloud service over IPv6. Here the recorded observation is: a fabric leaf isolates attached workloads whenever its sole spine-facing physical uplink fails. The applicable cause is: the leaf has a single spine failure domain instead of independent fabric uplinks.

That control reduces a separate risk: IPv6 addresses or routes are missing on at least one required hop; IPv4 reachability does not automatically deliver IPv6 traffic. For the described design, the recurring risk arises from: the leaf has a single spine failure domain instead of independent fabric uplinks. The specific required safeguard is: verify all leaves have the required spine adjacencies and symmetric route reachability.

A three-tier campus architecture is not the leaf-to-spine fabric needed for equal-cost datacenter paths.

Collapsed-core redundancy does not establish multiple routed spine paths from every leaf.

Interpreting the class bandwidth share and applying suitable class-based weighted fair queuing for the intended minimum service would not match trusted voice traffic into an appropriate QoS class and apply the intended service policy at the congested interface.

Defining a defensible QoS trust boundary that accepts trusted phone marking but reclassifies untrusted host traffic would not match trusted voice traffic into an appropriate QoS class and apply the intended service policy at the congested interface.

Applying a suitable policer with explicit conform/exceed actions to the guest class at the intended interface would not match trusted voice traffic into an appropriate QoS class and apply the intended service policy at the congested interface.

This test measures a different behavior: Capture DSCP values before and after ingress policies for both phone and desktop test flows. It does not establish the target outcome. For the documented fault, the direct acceptance test is: check class-map counters rise for the voice flow and verify queue service with simultaneous bulk traffic.

This test measures a different behavior: Compare conform/exceed counters and confirm out-of-profile packets follow the documented drop or remark action. It does not establish the target outcome. For the documented fault, the direct acceptance test is: check class-map counters rise for the voice flow and verify queue service with simultaneous bulk traffic.

This test measures a different behavior: Under congestion, verify transactional class service stays above its intended share without starving other classes. It does not establish the target outcome. For the documented fault, the direct acceptance test is: check class-map counters rise for the voice flow and verify queue service with simultaneous bulk traffic.