In the CCNP SWITCH 642-813 Official Certification Guide by Hucaby, about VTP pruning, you can find:
"Broadcast and unknown unicast frames on a VLAN are forwarded over a trunk link only if the switch on the receiving end of the trunk
has ports in that VLAN."
Suppose that you have 3 switches and this simple topology: SW1 ----- SW2 ----- SW3 where ----- is a trunk.
Suppose SW1 and SW3 have ports in VLAN 10 but SW2 not.
If I have to interpret the proposition literaly, both SW1 and SW3 prune VLAN 10 from the trunk to SW2 because SW2 has not ports in VLAN 10. I hope this is false. The algorithm through with pruning is deployed must be more detailed and I have a simple idea about this. Is it possible to find proposition "not very logically correct" also in an official certification guide?
Or do you think I am in error?