015 Trunking Protocols ISL DOT1Q

A VLAN trunk, or trunk, is a point-to-point link between two network devices.
Trunk Links carry traffic for multiple VLANs (more than one VLAN).
A VLAN trunk extends VLANs across two or more network devices.
Cisco trunks links are supported Fast Ethernet, Gig Ethernet, and 10-Gigabit Ethernet interfaces.
In order to make sure that same VLAN users on Multiples switches to communicate there is a method of tagging
Tagging happens only on the trunk links ( added / Removed)
Tag is added before a frame is send and removed once it is received on trunk link.

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