Which two of the following procedures can be performed on a VTP server to reset the VTP configuration revision number to 0? (Choose two. Each correct answer is a complete solution.)
- Disable VTP pruning, then enable VTP pruning.
- Change the VTP mode to client, and then back to server mode.
- Change the VTP mode to transparent, then back to server mode.
- Change the VTP domain name to a non-existent domain name, and then back to the correct domain name.
To reset the configuration revision number to 0, you should change the VLAN Trunking Protocol (VTP) domain to a non-existent domain name, and then back to the correct domain name. To change the domain name, issue the vtp domain command.
Alternatively, you can change the VTP mode to transparent mode, then back to client or server mode. To change the VTP mode, issue the vtp mode command from global configuration mode. To verify that the configuration revision number has been reset to 0, you should issue the show vtp status command.
Before adding a new switch to a VTP domain, you should reset the configuration revision number to 0. If the configuration revision number is higher than that of the other switches in the domain, then the switch can propagate incorrect configuration information to the other switches. This can cause virtual local area networks (VLANs) to be modified or deleted on every switch in the VTP domain.
The VTP configuration revision number will not be reset to 0 if you disable and then re-enable VTP pruning. VTP pruning can eliminate the flooding of broadcast traffic to switches that have no ports assigned to the virtual local area network (VLAN).
The VTP configuration revision number will not be reset to 0 if you change the VTP mode to client and then back to server. Both server-mode and client-mode switches propagate VTP information. Therefore, client-mode switches can cause incorrect information to be propagated if the configuration revision number is higher than other switches in the domain. Transparent-mode switches will not propagate its own VTP configuration, but will forward VTP information received from other switches.
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Configure and verify trunking