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Explanation/Reference: Explanation: Ethernet trunk interfaces support different trunking modes. You can set an interface as trunking or nontrunking or to negotiate trunking with the neighboring interface. To autonegotiate trunking, the interfaces must be in the same VTP domain. Trunk negotiation is managed by the Dynamic Trunking Protocol (DTP), which is a Point-to-Point Protocol. However, some internetworking devices might forward DTP frames improperly, which could cause misconfigurations. Reference: http://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst3750/software/release/12- 2_55_se/ configuration/guide/scg3750/swvlan.html