An engineer needs to add an old switch back into a network.
To prevent the switch from corrupting the VLAN database, with action must be taken?
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A. B. C. D.A.
When adding an old switch back into a network, there is a possibility of it corrupting the VLAN database. This could happen because the old switch may have an outdated VLAN configuration or a higher VTP revision number than the current network.
To prevent the switch from corrupting the VLAN database, the engineer should add the switch in the VTP domain with a lower revision number. This can be achieved by setting the VTP revision number on the new switch to a lower value than the current revision number in the network.
Option A: Add the switch in the VTP domain with a lower revision number, is the correct answer.
Option B: Adding the switch in the VTP domain with a higher revision number would result in the new switch becoming the VTP server and overwriting the existing VLAN configuration.
Option C: Adding the switch with DTP set to dynamic desirable would cause the switch to negotiate a trunk link with the neighboring switch, but it would not prevent the switch from corrupting the VLAN database.
Option D: Adding the switch with DTP set to desirable would also not prevent the switch from corrupting the VLAN database.
In summary, when adding an old switch back into a network, it's important to take precautions to prevent it from corrupting the VLAN database. The best way to do this is by adding the switch in the VTP domain with a lower revision number.