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Which one of the following is a Cisco proprietary technique for VLAN identification or trunk encapsulation?
ISL (Inter-Switch Link )is a Cisco-proprietary protocol for identifying the VLAN of frames that pass over a trunk link. CDP is a Cisco propriety protocol used to discover and collect information about Cisco collected devices. EIGRP is a Cisco propriety routing protocol. DTP is Dynamic Trunking Protocol used to negotiate trunk links. VTP is a VLAN Trunking Protocol used for managing VLAN information over a domain of switches.
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