ccna vtc

ccna vtc.Default VTP mode Yes No NoSave VLANs to NVRAM Yes No YesExam Points Keep in mind the differences between the various VTP modes shown in Table 12.2.Switches configured as VTP server or transparent mode can add, modify, and delete VLANs.The main difference between these two modes is that when the configuration is modified on a transparent switch, it affects only that switch and does not affect other switches in the network. However, when the configuration is modified on a VTP server switch, it propagates a VTP message about the modification on all trunk ports.The VTP server switch receives the VTP message, accepts the updates in it, and forwards the message outbound from the other trunk ports; whereas the transparent switch ignores the VTP message: it forwards the message outbound from the other trunk ports, but does not merged into the local VLAN configuration. In this sense, a transparent switch is like an island: changes made on a transparent switch affect only itself and not other switches, while changes made on other switches do not affect the transparent switch.A VTP client switch cannot modify its own VLAN configuration by itself, but needs a VTP server switch to tell it about VLAN changes. The client switch receives the VTP message from the server switch, accepts the changes in it, and floods the VTP message out of all other trunk ports.Typically, one switch is set to server mode and all other switches are set to client mode with control over who can perform changes on the server switch. But don't forget that if you make the wrong VLAN configuration on the server switch, this error will automatically propagate to all client switches in the network. Suppose you accidentally delete a VLAN on a server switch that contains 500 devices; in this case, all switches will remove ^ the VLAN from their configurations.With this in mind, some administrators do not like to use VTP server and client mode, preferring instead to set all switches to transparent mode. The problem with transparent mode is that it does not scale very well: if you need to add a VLAN to a network that contains 20 switches, you have to add the VLAN manually on each switch, which is a very time-consuming task. The advantage of this approach, of course, is that if a misconfiguration is made on a transparent switch, the problem is not propagated to other switches and is limited to local.It is also possible to set all switches to server mode, which is the default VTP setting. As you can see, there are many VTP configuration options, and you can even mix them: set two or three switches to server mode and set all other switches to client mode; or set one switch to server mode, set all other switches to client mode, and add all VLANs to the server switch, let the clients get this information, and then change All switches are changed to transparent mode. During the setup phase, this approach allows you to easily populate the switches with a consistent VLAN configuration. Note that if no VTP mode is assigned to the switch, it will default to server mode.12.3.2 VTP?shaw restIf a VTP client/server configuration is used, these switches will generate 3 types of VTP messages.