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Implementing Cisco Networking Solutions by Harpreet Singh

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Access ports and trunk ports

When two switches having more than one VLAN are connected to each other, they need a way to intimate the other switch about the VLAN number to which a particular frame belongs. The basic Ethernet header described earlier does not have any field to do this. IEEE defines a new specification 802.1Q that defines the use of VLAN, and how to transfer this information across the links that are shared by more than one VLANs. Ports that have only one VLAN are called access ports, and ports that need to connect to hosts in more than one VLAN are termed trunk ports. Generally, the inter switch links and the uplinks are trunk ports, and ports that connect to normal hosts are access ports:

Figure 5: Trunk port

The trunk ports ...

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