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Cisco Certified Network Associate (CCNA) · Cisco
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Just so hard to even understand the question, even before you get into the curriculum! You can read the question 2 ways. But the key for me is that you DONT add an old switch into the network/ domain with a higher revision number than the 'VTP server' So if you read the Question as, 'Add the switch with a lower revision number into the VTP domain', then its A If you read, 'lets make sure we add the switch with rev no (x) to the domain with the highest VTP revision (y) and hope (y) is higher than (x)!!', then its B Id be going B in the exam....
One danger of VTP: If you connect an old switch with a higher revision number to your network (and the VTP domain name matches), all switches in the domain will sync their VLAN database to that switch.
A is correct