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That diagnosis is supported by a different symptom: A basic destination-port ACL permits both harmless and malicious traffic on TCP443. Here the recorded observation is: a user moved to a new VLAN bypasses the old subnet-based segmentation policy. The applicable cause is: policy was tied only to IP/VLAN placement rather than the intended TrustSec identity tags.

That diagnosis is supported by a different symptom: The destination SGACL treats all traffic as unknown SGT despite correct access-edge classification. Here the recorded observation is: a user moved to a new VLAN bypasses the old subnet-based segmentation policy. The applicable cause is: policy was tied only to IP/VLAN placement rather than the intended TrustSec identity tags.

That diagnosis is supported by a different symptom: A passive tap reads sensitive unencrypted payloads on the supposedly protected switch-to-switch wire. Here the recorded observation is: a user moved to a new VLAN bypasses the old subnet-based segmentation policy. The applicable cause is: policy was tied only to IP/VLAN placement rather than the intended TrustSec identity tags.

This test measures a different behavior: Capture frames on the physical link and confirm encrypted MACsec data with authorized peers maintaining connectivity. It does not establish the target outcome. For the documented fault, the direct acceptance test is: test the intended source/destination SGT pair across VLAN changes and check policy counters.

That control reduces a separate risk: Endpoint admission and posture enforcement are absent at access boundaries. For the described design, the recurring risk arises from: policy was tied only to IP/VLAN placement rather than the intended TrustSec identity tags. The specific required safeguard is: review SGT classification and SGACL matrix assignments as identity groups change.

The needed correction is to use Cisco TrustSec security group tags and SGACL enforcement where the platform and design support it.

The needed correction is to enable the supported SGT propagation or mapping mechanism across the relevant transit path.

Applying supported CoPP or control-plane protection to the punt path in addition to relevant interface ACLs would not enable the supported SGT propagation or mapping mechanism across the relevant transit path.

Using supported IEEE 802.1AE MACsec link encryption and compatible key agreement on both switch endpoints would not enable the supported SGT propagation or mapping mechanism across the relevant transit path.

This test measures a different behavior: Generate controlled packets to router-local addresses and inspect control-plane class counters. It does not establish the target outcome. For the documented fault, the direct acceptance test is: inspect tag values at ingress and enforcement devices for a controlled endpoint flow.

This test measures a different behavior: Capture frames on the physical link and confirm encrypted MACsec data with authorized peers maintaining connectivity. It does not establish the target outcome. For the documented fault, the direct acceptance test is: inspect tag values at ingress and enforcement devices for a controlled endpoint flow.

This test measures a different behavior: Test the intended source/destination SGT pair across VLAN changes and check policy counters. It does not establish the target outcome. For the documented fault, the direct acceptance test is: inspect tag values at ingress and enforcement devices for a controlled endpoint flow.

That diagnosis is supported by a different symptom: A passive tap reads sensitive unencrypted payloads on the supposedly protected switch-to-switch wire. Here the recorded observation is: the destination SGACL treats all traffic as unknown SGT despite correct access-edge classification. The applicable cause is: the transit path does not carry or reconstruct security group tags to the enforcement point.

That diagnosis is supported by a different symptom: Traffic destined to the router CPU remains unpoliced although a transit-forwarding ACL exists. Here the recorded observation is: the destination SGACL treats all traffic as unknown SGT despite correct access-edge classification. The applicable cause is: the transit path does not carry or reconstruct security group tags to the enforcement point.

That diagnosis is supported by a different symptom: A user moved to a new VLAN bypasses the old subnet-based segmentation policy. Here the recorded observation is: the destination SGACL treats all traffic as unknown SGT despite correct access-edge classification. The applicable cause is: the transit path does not carry or reconstruct security group tags to the enforcement point.

That control reduces a separate risk: No internal segmentation or layered threat controls protect east-west movement. For the described design, the recurring risk arises from: the transit path does not carry or reconstruct security group tags to the enforcement point. The specific required safeguard is: audit SGT propagation when traversing mixed-capability fabric and firewalls.

That control reduces a separate risk: The Ethernet hop lacks functioning MACsec encryption despite ordinary VLAN segmentation. For the described design, the recurring risk arises from: the transit path does not carry or reconstruct security group tags to the enforcement point. The specific required safeguard is: audit SGT propagation when traversing mixed-capability fabric and firewalls.

That control reduces a separate risk: Policy was tied only to IP/VLAN placement rather than the intended TrustSec identity tags. For the described design, the recurring risk arises from: the transit path does not carry or reconstruct security group tags to the enforcement point. The specific required safeguard is: audit SGT propagation when traversing mixed-capability fabric and firewalls.

Inspecting the actual Python dictionary/list schema and access the named key appropriate to the returned structure would not address the need for append each interface record to an accumulating list.

Wrap per-device transport calls in scoped exception handling and record failures without terminating the outer loop would not address the need for append each interface record to an accumulating list.

Using Python's supported JSON serializer rather than constructing escaped JSON by string concatenation would not address the need for append each interface record to an accumulating list.

This test measures a different behavior: Test a description containing quotes and backslashes and confirm parsed JSON recovers the original text. It does not establish the target outcome. For the documented fault, the direct acceptance test is: run the script on three known interfaces and verify all three entries exist in output.

This test measures a different behavior: Print or assert the parsed JSON types and retrieve the intended interface field in a test. It does not establish the target outcome. For the documented fault, the direct acceptance test is: run the script on three known interfaces and verify all three entries exist in output.

This test measures a different behavior: Simulate an unreachable device between two healthy routers and confirm both healthy results appear. It does not establish the target outcome. For the documented fault, the direct acceptance test is: run the script on three known interfaces and verify all three entries exist in output.

That diagnosis is supported by a different symptom: An otherwise valid report becomes syntactically invalid when a description includes `"` characters. Here the recorded observation is: only interface GigabitEthernet1/0/3 appears after iterating over three interfaces. The applicable cause is: the loop overwrote the result variable on every iteration rather than appending entries.

That diagnosis is supported by a different symptom: A TypeError or KeyError occurs although the HTTP call returned valid JSON. Here the recorded observation is: only interface GigabitEthernet1/0/3 appears after iterating over three interfaces. The applicable cause is: the loop overwrote the result variable on every iteration rather than appending entries.

That diagnosis is supported by a different symptom: The first timeout aborts inventory collection for every subsequent device. Here the recorded observation is: only interface GigabitEthernet1/0/3 appears after iterating over three interfaces. The applicable cause is: the loop overwrote the result variable on every iteration rather than appending entries.

That control reduces a separate risk: The Python script assumes list indices where the decoded JSON actually uses an object mapping. For the described design, the recurring risk arises from: the loop overwrote the result variable on every iteration rather than appending entries. The specific required safeguard is: use small fixture inputs and assertions for multi-record parsers before production scans.

That control reduces a separate risk: Manual string concatenation does not correctly escape special JSON characters. For the described design, the recurring risk arises from: the loop overwrote the result variable on every iteration rather than appending entries. The specific required safeguard is: use small fixture inputs and assertions for multi-record parsers before production scans.

That control reduces a separate risk: The script has no per-device exception boundary around connection errors. For the described design, the recurring risk arises from: the loop overwrote the result variable on every iteration rather than appending entries. The specific required safeguard is: use small fixture inputs and assertions for multi-record parsers before production scans.

Using Python's supported JSON serializer rather than constructing escaped JSON by string concatenation would not inspect the actual Python dictionary/list schema and access the named key appropriate to the returned structure.

Using guarded dictionary access or explicitly handle missing serial-number fields in the parser would not inspect the actual Python dictionary/list schema and access the named key appropriate to the returned structure.

Append each interface record to an accumulating list would not inspect the actual Python dictionary/list schema and access the named key appropriate to the returned structure.