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i'm reading CCNA stuff and just got stuck in this issue: i read some articles about DTP and trunking but didn't understand when to make a port trunk and when make it dynamic desirable ? in what case you may want a port be sometime access and sometime in trunk mode ? and why you may want a port just receive a trunk and not send it (in the case of being port mode dynamic auto)

thanks

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Cisco created DTP in large part to make configuration easy or more flexible, way back in the innocent days when security was not a big concern.

But modern good practice is to set the switch port statically- either access or trunk- to prevent someone from getting access to VLANS that they shouldn’t.

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