Which of these best describes the actions taken when a VTP message is received on a switch
configured with the VTP mode “transparent”?
A.
VTP updates are ignored and forwarded out all ports.
B.
VTP updates are ignored and forwarded out trunks only.
C.
VTP updates are made to the VLAN database and are forwarded out trunks only.
D.
VTP updates are ignored and are not forwarded.
Explanation:
You can configure a switch to operate in any one of these VTP modes:
Server–In VTP server mode, you can create, modify, and delete VLANs and specify other
configuration parameters, such as VTP version and VTP pruning, for the entire VTP domain. VTP
servers advertise their VLAN configuration to other switches in the same VTP domain and
synchronize their VLAN configuration with other switches based on advertisements received over
trunk links. VTP server is the default mode.
Client–VTP clients behave the same way as VTP servers, but you cannot create, change, or
delete VLANs on a VTP client.
Transparent–VTP transparent switches do not participate in VTP. A VTP transparent switch does
not advertise its VLAN configuration and does not synchronize its VLAN configuration based on
received advertisements, but transparent switches do forward VTP advertisements that they
receive out their trunk ports in VTP Version 2. Off (configurable only in CatOS switches)–In the
three described modes, VTP advertisements are received and transmitted as soon as the switch
enters the management domain state. In the VTP off mode, switches behave the same as in VTP
transparent mode with the exception that VTP advertisements are not forwarded.
VTP V2
VTP V2 is not much different than VTP V1. The major difference is that VTP V2 introduces support
for Token Ring VLANs. If you use Token Ring VLANs, you must enable VTP V2. Otherwise, there
is no reason to use VTP V2. Changing the VTP version from 1 to 2 will not cause a switch to
reload.
VTP Password If you configure a password for VTP, you must configure the password on all
switches in the VTP domain. The password must be the same password on all those switches.The VTP password that you configure is translated by algorithm into a 16-byte word (MD5 value)
that is carried in all summary-advertisement VTP packets.
VTP Pruning
VTP ensures that all switches in the VTP domain are aware of all VLANs. However, there are
occasions when VTP can create unnecessary traffic. All unknown unicasts and broadcasts in a
VLAN are flooded over the entire VLAN. All switches in the network receive all broadcasts, even in
situations in which few users are connected in that VLAN. VTP pruning is a feature that you use in
order to eliminate or prune this unnecessary traffic.http://www.cisco.com/en/US/tech/tk389/tk689/technologies_tech_note09186a0080094c52.shtml