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Configuring the port as a static access port in the intended VLAN and disable DTP negotiation where supported would not set a compatible explicit trunking mode on the intended switch-to-switch link and use correct VLAN/tagging settings.

Activating and verifying the VLAN in the local VLAN database after ensuring it is approved on the trunk would not set a compatible explicit trunking mode on the intended switch-to-switch link and use correct VLAN/tagging settings.

Setting the same authorized native VLAN on both ends of the trunk and avoid carrying unrelated user traffic untagged would not set a compatible explicit trunking mode on the intended switch-to-switch link and use correct VLAN/tagging settings.

This test measures a different behavior: Compare native VLAN outputs and native-VLAN mismatch log messages after a controlled fix. It does not establish the target outcome. For the documented fault, the direct acceptance test is: verify operational trunk state and negotiated mode on both interfaces.

This test measures a different behavior: Verify the operational mode remains access when a test device sends DTP frames. It does not establish the target outcome. For the documented fault, the direct acceptance test is: verify operational trunk state and negotiated mode on both interfaces.

This test measures a different behavior: Inspect DTP negotiation counters and confirm the operational mode becomes trunk while the opposite port remains dynamic auto. It does not establish the target outcome. For the documented fault, the direct acceptance test is: verify operational trunk state and negotiated mode on both interfaces.

That diagnosis is supported by a different symptom: An unauthorized switch negotiates a trunk and carries unintended tagged traffic from an endpoint port. Here the recorded observation is: one side reports trunking while the peer forwards frames as an access port. The applicable cause is: the switchport modes are incompatible for the intended 802.1Q trunk.

That diagnosis is supported by a different symptom: The link remains an access link despite both sides being enabled for dynamic trunking. Here the recorded observation is: one side reports trunking while the peer forwards frames as an access port. The applicable cause is: the switchport modes are incompatible for the intended 802.1Q trunk.

That diagnosis is supported by a different symptom: Frames from untagged VLAN99 are placed into the wrong VLAN by the neighbor. Here the recorded observation is: one side reports trunking while the peer forwards frames as an access port. The applicable cause is: the switchport modes are incompatible for the intended 802.1Q trunk.

Consistent native VLANs matter after trunk establishment, but they do not change a port explicitly configured as access into a trunk.

That control reduces a separate risk: Dynamic trunk negotiation was left enabled on a workstation-facing interface. For the described design, the recurring risk arises from: the switchport modes are incompatible for the intended 802.1Q trunk. The specific required safeguard is: prefer explicit trunk settings in infrastructure links and check changes at both endpoints.

Dynamic desirable cannot make a link trunk while the opposing port remains hard-set to access mode.

The needed correction is to set the same authorized native VLAN on both ends of the trunk and avoid carrying unrelated user traffic untagged.

Configuring the port as a static access port in the intended VLAN and disable DTP negotiation where supported would not set the same authorized native VLAN on both ends of the trunk and avoid carrying unrelated user traffic untagged.

Activating and verifying the VLAN in the local VLAN database after ensuring it is approved on the trunk would not set the same authorized native VLAN on both ends of the trunk and avoid carrying unrelated user traffic untagged.

This test measures a different behavior: Compare allowed, active and STP-forwarding VLAN sets in `show interfaces trunk` output. It does not establish the target outcome. For the documented fault, the direct acceptance test is: compare native VLAN outputs and native-VLAN mismatch log messages after a controlled fix.

This test measures a different behavior: Verify the operational mode remains access when a test device sends DTP frames. It does not establish the target outcome. For the documented fault, the direct acceptance test is: compare native VLAN outputs and native-VLAN mismatch log messages after a controlled fix.

This test measures a different behavior: Inspect DTP negotiation counters and confirm the operational mode becomes trunk while the opposite port remains dynamic auto. It does not establish the target outcome. For the documented fault, the direct acceptance test is: compare native VLAN outputs and native-VLAN mismatch log messages after a controlled fix.

That diagnosis is supported by a different symptom: The link remains an access link despite both sides being enabled for dynamic trunking. Here the recorded observation is: frames from untagged VLAN99 are placed into the wrong VLAN by the neighbor. The applicable cause is: the trunk ends disagree on native VLAN, causing untagged frame classification mismatch.

That diagnosis is supported by a different symptom: An unauthorized switch negotiates a trunk and carries unintended tagged traffic from an endpoint port. Here the recorded observation is: frames from untagged VLAN99 are placed into the wrong VLAN by the neighbor. The applicable cause is: the trunk ends disagree on native VLAN, causing untagged frame classification mismatch.

That diagnosis is supported by a different symptom: The VLAN appears in the allowed list but not in the active VLAN set. Here the recorded observation is: frames from untagged VLAN99 are placed into the wrong VLAN by the neighbor. The applicable cause is: the trunk ends disagree on native VLAN, causing untagged frame classification mismatch.

That control reduces a separate risk: An inactive or missing VLAN in the switch VLAN database prevents forwarding on the trunk. For the described design, the recurring risk arises from: the trunk ends disagree on native VLAN, causing untagged frame classification mismatch. The specific required safeguard is: review native VLAN consistency and avoid using untrusted end-user access VLANs as trunk native.

That control reduces a separate risk: Dynamic trunk negotiation was left enabled on a workstation-facing interface. For the described design, the recurring risk arises from: the trunk ends disagree on native VLAN, causing untagged frame classification mismatch. The specific required safeguard is: review native VLAN consistency and avoid using untrusted end-user access VLANs as trunk native.

That control reduces a separate risk: Both sides are passive in DTP dynamic auto; neither proposes trunking to the other. For the described design, the recurring risk arises from: the trunk ends disagree on native VLAN, causing untagged frame classification mismatch. The specific required safeguard is: review native VLAN consistency and avoid using untrusted end-user access VLANs as trunk native.

The trunk ends disagree on native VLAN, causing untagged frame classification mismatch. Both sides are passive in DTP dynamic auto; neither proposes trunking to the other.

The trunk allowed VLAN filter omits VLAN30 despite the VLAN existing on both switches. Both sides are passive in DTP dynamic auto; neither proposes trunking to the other.

Dynamic trunk negotiation was left enabled on a workstation-facing interface. Both sides are passive in DTP dynamic auto; neither proposes trunking to the other.

This test measures a different behavior: Verify the operational mode remains access when a test device sends DTP frames. It does not establish the target outcome. For the documented fault, the direct acceptance test is: inspect DTP negotiation counters and confirm the operational mode becomes trunk while the opposite port remains dynamic auto.

This test measures a different behavior: Verify operational trunk state and negotiated mode on both interfaces. It does not establish the target outcome. For the documented fault, the direct acceptance test is: inspect DTP negotiation counters and confirm the operational mode becomes trunk while the opposite port remains dynamic auto.

This test measures a different behavior: Check `show interfaces trunk` permits VLAN30 at both ends and test VLAN30 end-to-end. It does not establish the target outcome. For the documented fault, the direct acceptance test is: inspect DTP negotiation counters and confirm the operational mode becomes trunk while the opposite port remains dynamic auto.

That diagnosis is supported by a different symptom: An unauthorized switch negotiates a trunk and carries unintended tagged traffic from an endpoint port. Here the recorded observation is: the link remains an access link despite both sides being enabled for dynamic trunking. The applicable cause is: both sides are passive in DTP dynamic auto; neither proposes trunking to the other.

That diagnosis is supported by a different symptom: VLAN10 and VLAN20 traverse the link but hosts in VLAN30 cannot reach their remote gateway. Here the recorded observation is: the link remains an access link despite both sides being enabled for dynamic trunking. The applicable cause is: both sides are passive in DTP dynamic auto; neither proposes trunking to the other.

That diagnosis is supported by a different symptom: One side reports trunking while the peer forwards frames as an access port. Here the recorded observation is: the link remains an access link despite both sides being enabled for dynamic trunking. The applicable cause is: both sides are passive in DTP dynamic auto; neither proposes trunking to the other.