Importance of Trunking on Switch Ports
Q: Why is it important to enable trunking on a switch port that connects to another switch?
- VLAN Configuration and Inter-VLAN Routing
- Junior level question
Explore all the latest VLAN Configuration and Inter-VLAN Routing interview questions and answers
ExploreMost Recent & up-to date
100% Actual interview focused
Create VLAN Configuration and Inter-VLAN Routing interview for FREE!
Enabling trunking on a switch port that connects to another switch is crucial because it allows for the transmission of traffic from multiple VLANs over a single physical link. This is essential in a switched network environment to efficiently manage bandwidth and reduce the number of required physical connections.
When trunking is enabled, the switch port can carry traffic for all configured VLANs, distinguished by VLAN tags added to the Ethernet frames. This means that, instead of needing a separate link for each VLAN between switches, a single trunk link can be utilized. For example, if we have multiple VLANs for different departments in an organization, such as VLAN 10 for Sales, VLAN 20 for Marketing, and VLAN 30 for Engineering, trunking enables these VLANs to share the same physical connection without interference.
Moreover, enabling trunking is crucial for inter-VLAN routing to function correctly. Routers or layer 3 switches can then route traffic between these VLANs seamlessly, ensuring effective communication across the network. Without trunking, devices in different VLANs would be isolated from each other, severely limiting connectivity and impacting overall network performance.
In summary, enabling trunking optimizes network efficiency, supports inter-VLAN communication, and simplifies the physical networking infrastructure.
When trunking is enabled, the switch port can carry traffic for all configured VLANs, distinguished by VLAN tags added to the Ethernet frames. This means that, instead of needing a separate link for each VLAN between switches, a single trunk link can be utilized. For example, if we have multiple VLANs for different departments in an organization, such as VLAN 10 for Sales, VLAN 20 for Marketing, and VLAN 30 for Engineering, trunking enables these VLANs to share the same physical connection without interference.
Moreover, enabling trunking is crucial for inter-VLAN routing to function correctly. Routers or layer 3 switches can then route traffic between these VLANs seamlessly, ensuring effective communication across the network. Without trunking, devices in different VLANs would be isolated from each other, severely limiting connectivity and impacting overall network performance.
In summary, enabling trunking optimizes network efficiency, supports inter-VLAN communication, and simplifies the physical networking infrastructure.


