An administrator has determined that the traffic from a...

Name: Problem 11, Chapter 6: Routing and Switching Essentials V6 Companion Guide
Uploaded: 2025-09-17T21:58:57-08:00
Duration: 1 min 19 s
Channel: James Kiss
Description: An administrator has determined that the traffic from a switch that corresponds to a VLAN is not being received on another switch over a trunk link. What could be the problem? A. Allowed VLANs on trunks B. Dynamic desirable mode on one of the trunk links C. Native VLAN mismatch D. Trunk mode mismatch

An administrator has determined that the traffic from a switch that corresponds to a VLAN is not being received on another switch over a trunk link. What could be the problem? A. Allowed VLANs on trunks B. Dynamic desirable mode on one of the trunk links C. Native VLAN mismatch D. Trunk mode mismatch

An administrator has determined that the traffic from a switch that corresponds to a VLAN is not being received on another switch over a trunk link. What could be the problem?
A. Allowed VLANs on trunks
B. Dynamic desirable mode on one of the trunk links
C. Native VLAN mismatch
D. Trunk mode mismatch

Key Concepts

Virtual Local Area Network (VLAN)

A virtual LAN segments a physical network into multiple logical networks, allowing for improved traffic management, security, and efficiency. VLANs help separate broadcast domains, meaning that devices within the same VLAN can communicate directly while traffic between different VLANs is typically routed through a layer-3 device.

Trunk Link

A trunk link is a network connection between switches that carries traffic for multiple VLANs over a single physical link. It uses tagging protocols (like IEEE 802.1Q) to identify the VLAN to which each frame belongs, ensuring that traffic is correctly segregated despite sharing the same transmission medium.

Allowed VLAN Configuration on Trunks

The allowed VLAN configuration is a setting on trunk ports that specifies which VLANs are permitted to traverse the link. If a VLAN is not included in the allowed list, traffic for that VLAN will be blocked, leading to connectivity issues across the trunk.

Native VLAN

The native VLAN on a trunk link is the VLAN whose traffic is transmitted untagged. A mismatch in the native VLAN configuration between connected switches can cause untagged traffic from one switch to be misinterpreted by the other, resulting in traffic delivery problems and potential security risks.

Trunk Mode and Protocol Negotiation

Trunk mode refers to the operational state of a switch port (such as 'trunk', 'access', or dynamic modes) that dictates whether it is sending and receiving multiple VLAN traffic. Protocol negotiation mechanisms like Dynamic Trunking Protocol (DTP) help switches automatically form trunk links. Mismatches in trunk mode settings or negotiation failures can prevent proper trunk establishment and lead to connectivity issues.

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