Which two statements about VTP are true? (Choose two.)
A. All switches must be configured with the same VTP domain name
B. All switches must be configured to perform trunk negotiation.
C. All switches must be configured with a unique VTP domain name
D. D. The VTP server must have the highest revision number in the domain
E. All switches must use the same VTP version.
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A: They have to be in the same domain
D: If the server does not have the highest revision number, the database will be ruined. So you have to be careful when implementing a new switch in a VTP domain. You could take down a complete network.
D? No… You can have a VTP client with a higher revision number. In this case the VLAN database from the client will overwrite the server’s database but VTP will still continue to work. This won’t prevent VTP from working.
VTP won’t work at all if switches don’t do trunking.
A AND E
Answers are D and E:
https://www.cisco.com/c/en/us/support/docs/lan-switching/vtp/98154-conf-vlan.html#req
VTP Configuration Guidelines
This section provides some guidelines for the configuration of VTP in the network.
All switches have the same the VTP domain name, unless the network design insists for different VTP domains.
Note: Trunk negotiation does not work across VTP domains. Refer to the Data Traffic Blocked between VTP Domains section of Troubleshooting VLAN Trunk Protocol (VTP) for more information.
All switches in a VTP domain must run the same VTP version. <————
All switches in a VTP domain has the same VTP password, if there is any.
All VTP Server switch(es) should have the same configuration revision number and it should also be the highest in the domain. <————
When you move a VTP mode of a switch from Transparent to Server, VLANs configured on the VTP Transparent switch should exist on the Server switch.
The correct answer is A and D. The reason why it isn’t E is because of a feature called Version-Dependent Transparent Mode in which a switch will forward VTP v2 packets as well as VTP v1 packets (without checking the version).
Version-Dependent Transparent Mode—In VTP version 1, a VTP transparent network device
inspects VTP messages for the domain name AND version and forwards a message only if the version AND domain name match. However, because only one domain is supported, VTP version 2 forwards VTP messages in transparent mode without checking the version.
https://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst6500/ios/15-1SY/config_guide/sup2T/15_1_sy_swcg_2T/vtp.pdf