What should you do?

You need to address issues of bandwidth contention and consumption across a trunk link and on VLAN 1. What should you do?

A.
Permit any number of VLANs to traverse the trunk link

B.
Permit only those VLANs that are required for Layer 2 access and connectivity to traverse the trunk link

C.
Deny any single, range, or group of VLANs to traverse the trunk link

D.
Permit any single, range, or group of VLANs to traverse the trunk link

Explanation:
content\166040\plo_content\ORG1114\COURSE166040\enus_011425\lsn_03\tpc_b\enus_011425_03b.xml:
The default behavior of VLAN trunks is to permit all VLANs across a trunk link. To further address issues of bandwidth contention and consumption across a trunk link and on VLAN1, a network administrator can either permit or deny any single, range, or group of VLANs to traverse the trunk link. It is a best practice to limit the trunk link to only the intended VLANs required for Layer 2 access and connectivity. This improves bandwidth utilization by restricting unwanted VLAN traffic from the link. In addition, explicitly permitting or denying VLANs to a specific trunk link creates a simple deterministic Layer 2 switched domain where there are few unknown variables to cause problems and complicate troubleshooting.
Because of the deterministic nature of the composite network model, DTP should not be required. To fully realize the advantages of a deterministic network, trunk links, encapsulation types, and access ports should be statically configured across specific links according to the network design and requirements.
Dynamic Trunking Protocol (DTP) is a Cisco proprietary protocol for negotiating trunking on a link between two devices and for negotiating the type of trunking encapsulation to be used.