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For questions about trunks, layer-2 links across which traffic for multiple VLANs travel.

3 votes

what is the relation between DTP and VTP?

specifically related to VTP though if you use VTP and do not configure it correctly, your VLAN configuration on the various switches will be inconsistent which may prevent DTP from forming appropriate Trunk
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4 votes

Non VLAN Tagged Traffic Not Going Through Trunk Between Cisco Switches

You set the interface native (untagged) VLAN to VLAN ID 1 and then only allowed VLAN 79 on the Trunk interface so untagged packets (VLAN 1) cannot pass over it. … Trunk interfaces pass only tagged frames and the native VLAN so if you apply a VLAN allow list, that will exclude any unlisted VLAN even if it is the native or untagged VLAN. …
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