A network engineer is connecting two Cisco switches using an 802.1Q trunk. The native VLAN on Switch A is configured as 1, and on Switch B it is configured as 99. What is a possible result of this native VLAN mismatch?
Spanning Tree Protocol will block the trunk port due to BPDU errors.
The trunk link will fail to establish, causing loss of connectivity.
This mismatch will lead to a broadcast storm across the network.
Untagged traffic from Switch A will be sent to the native network on Switch B.
When there is a native VLAN mismatch on an 802.1Q trunk between two switches, untagged traffic sent from one switch's native VLAN will be received on the other switch's native VLAN. This can cause traffic from the native network on Switch A to be improperly forwarded to the native network on Switch B, leading to security issues and traffic leaks between networks. The trunk link will still establish, and Spanning Tree Protocol (STP) does not block ports because of native VLAN mismatches. A broadcast storm is not a direct result of a native VLAN mismatch.
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Cisco CCNA 200-301
Network Access
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