So, What Do You Want to Be? (Asks the Port)
Trunks can be automatically negotiated between two switches, or between a switch and a device that can support trunking. Automatic negotiation to determine whether a port will be an access port or a trunk port is risky because an attacker could potentially negotiate a trunk with a switch; then the attacker could directly access any available VLANs simply by illegally tagging the traffic directly from his PC.
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