A network administrator needs to configure a trunk link between a Cisco switch and a non-Cisco switch to carry multiple VLANs. Which trunking protocol should the administrator use to ensure VLAN tagging compatibility across both devices?
DTP
VTP
ISL
802.1Q
The IEEE 802.1Q standard is the industry-standard method for VLAN tagging over Ethernet networks. It inserts a VLAN tag into the Ethernet frame, allowing switches to identify the VLAN to which a frame belongs. Because it's an open standard, 802.1Q ensures compatibility between devices from different vendors. ISL (Inter-Switch Link) is a Cisco proprietary protocol and is not supported on non-Cisco devices. VTP (VLAN Trunking Protocol) manages VLAN configuration across switches but does not perform VLAN tagging. DTP (Dynamic Trunking Protocol) negotiates trunk links between switches but is also Cisco proprietary and does not address VLAN tagging compatibility with non-Cisco devices.
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