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A Cisco switch will be soon connected to a non-Cisco router. For compatibility reasons, which of the following Ethernet trunking protocol standard should be used?
VTP
RSTP
802.1Q
ISL
The IEEE 802.1Q is an open standard trunking protocol used for interconnecting VLANs between Cisco and Non-Cisco network devices. The ISL is a Cisco-proprietary protocol (except 2940 and 2950 series of switches). (http://www.cisco.com/c/en/us/support/docs/lan-switching/inter-vlan-routing/14976-50.html)
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