What is the purpose of a trunk link?
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A trunk link is a network link that is capable of carrying traffic for multiple VLANs between multiple switches. The purpose of a trunk link is to allow multiple VLANs to be carried over a single physical connection, which can help to reduce the amount of cabling required in a network.
When a trunk link is established between two switches, the switches use a trunking protocol to negotiate the parameters of the link, such as the allowed VLANs and the encapsulation method to be used. The most common trunking protocol is IEEE 802.1Q, which adds a tag to each Ethernet frame to identify the VLAN to which the frame belongs.
One of the benefits of using trunk links is that they allow network administrators to create logical networks that span multiple physical switches. This can be particularly useful in large enterprise networks, where it may not be practical to connect every switch directly to every other switch. By using trunk links to connect multiple switches, administrators can create a single logical network that spans the entire enterprise.
Trunk links can also be used to aggregate multiple native VLANs into a single bridging domain. This allows the switches to treat the native VLANs as a single VLAN, which can simplify network management and reduce the risk of configuration errors.
In summary, the purpose of a trunk link is to carry traffic for multiple VLANs between multiple switches, allowing network administrators to create logical networks that span multiple physical switches and to aggregate multiple native VLANs into a single bridging domain.