During an audit of network devices, a network technician notices that a newly deployed switch is not allowing traffic from multiple VLANs to traverse its connected router interface. Which of the following configurations should the technician check FIRST to ensure proper communication between the VLANs and the router?
speed and duplex settings on the router's interface
firewall settings in the router
trunk port configuration on the switch
access port VLAN assignment on the switch
DHCP scope settings for multiple VLANs
the routing table on the router