1) does CDP reveal vlan ID, voice vlan ID, trunk native vlan ID?? Or only Vlan ID and voice vlan id?
2) Also what is native vlan and default vlan? Is there a simple explanation?
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CDP short for Cisco Discovery Porocol is a proprietary protocol developed by cisco to discover information about directly connected devices via the Data Link Layer.
It can not determine vlan alone.
Native VLAN is the vlan assigned to not be tagged. Default VLAN from cisco is vlan 1
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1cisco.com/c/en/us/support/docs/switches/… Version 2 added vlan information (native, and voice [aka Appliance]) VTP is required to learn more than those basic VLANs.– RickyCommented Oct 10, 2017 at 0:24