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For switches to participate in a VTP (VLAN Trunking Protocol) domain, it is essential that they all share the same VTP domain name. This requirement ensures that the switches are part of the same management domain and can exchange VLAN information effectively and accurately. The VTP domain name acts as a unique identifier for managing VLAN configurations across the network, allowing all switches within the domain to propagate VLAN advertisements and updates to each other.

When switches are configured with the same VTP domain name, they can communicate about VLANs and synchronize their VLAN databases. This synchronization is crucial for maintaining consistency across the network, especially in networks that utilize multiple switches that need to share VLAN information to function correctly. Without the same VTP domain name, switches will not recognize each other as part of the same VLAN management group, leading to potential misconfigurations and inconsistencies.