Identifyng the VLAN
Switches use frame tagging method to perform this function.
1) Access link
An access link that is port only one VLAN.
2)Trunk link
Trunk can carry multiple VLAN's. A trunk link is used to connect switches to other switches. Trunk link are supported on fast Ethernet or gigabyte Ethernet only. To identify the VLAN that a frame belongs to CISCO switches support two identification technique
a) ISL (Inter Switch Link)
b) IEEE 802.1Q
Configuration
(config) # VLAN 2 name ccna
(config) # int e0/4
(config-if) # vlan-membership static 2
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