CompTIA Network+ Practice Test

What happens if the native VLAN IDs do not match between switches?

1. They will create a secure connection

2. A message will be generated indicating a mismatch

3. The switches will automatically adjust the VLAN IDs

4. No impact will be observed

The correct answer is: A message will be generated indicating a mismatch

When the native VLAN IDs do not match between switches, a message is generated that indicates a mismatch. The native VLAN is the default VLAN associated with a trunk port, and if the settings do not align across switches, network devices will interpret this discrepancy as a configuration problem. This mismatch can lead to issues with untagged traffic and potentially pose vulnerabilities in the network. The generation of a message alerting users of the mismatch is crucial for network administration. It allows network engineers to identify and resolve the discrepancy before it leads to larger network issues such as traffic leaks or misrouted packets. In contrast, the other options provided imply either an automatic adjustment of settings or no observable impact, neither of which accurately represent the behavior of networking devices in the presence of VLAN mismatches.