Configuring Cisco Trunk Links
As a CCNA candidate you must be familiar with the functions and configuration of trunk links.
In brief a trunk link is any connection between two switches where there is the need to carry traffic for multiple vlans.
When a switch sends traffic out of one of it’s switch ports belonging to a vlan across to another switch it must mark the frame as being a member of that originating vlan on the sending switch so that the receiving switch can determine into which vlan to place the frame.
In the CCNA there are various methods of trunk link configuration that you must know and understand.