Cisco Certified Support Technician (CCST) NetworkingNetwork AccessEasy
A network technician is configuring a new Cisco switch and needs to ensure that multiple VLANs can traverse a single physical link between this switch and another switch. Which type of port configuration is required for the interface connecting these two switches?
- ATrunk port
- BAccess port
- CRouted port
- DSPAN port
Show answer & explanationAnswer & explanation
Correct answer: A. Trunk port
A trunk port is specifically designed to carry traffic for multiple VLANs over a single physical link between switches or between a switch and a router. It uses encapsulation protocols like IEEE 802.1Q to identify which VLAN each frame belongs to.
Why the other options are wrong
- B. An access port carries traffic for only a single VLAN and is typically used for end devices.
- C. A routed port (Layer 3 port) acts like a router interface and does not carry multiple VLANs on a single physical link in the context of inter-switch communication.
- D. A SPAN (Switched Port Analyzer) port is used for traffic monitoring, not for carrying multiple production VLANs between switches.
Trunk Port
A switch port configured to carry traffic for multiple VLANs over a single physical link, typically using 802.1Q tagging.
- Connects switches to other switches or routers.
- Allows VLANs to extend across multiple network devices.
- Uses encapsulation (e.g., 802.1Q) to identify VLANs.
Memory trick: Trunk: The multi-lane bridge for VLANs.