Hi all. Just passed my CCCENT last week and am hitting the CCNA material - VLANS and VTP.
I understand Cisco catalyst switches default to a VLAN server but I'm having problems finding what the default VTP negotiation would be with no additional configuration. I think I understand what each mode does, just not what the default behavior is if you don't specify in the config. And, do all switchports default to an implied access port?
The default VTP status is 'Server' and 'Null domain'.
If all switches in the switched network have a 'Null domain', no VTP updates will be exchange regardless their VTP status 'Server or Client'.
If you enter a VTP Domain Name on a switch, it will automatically propagate this name on the switches with 'Null Domain' as long as the inter-switch link are trunk links.
Access switches such as 3750, 2960 and 3560 default to dynamic auto and Core switches such as 4500 and 6500 default to dynamic desirable. Note: 3550 was an oddity as it defaulted to dynamic desirable.
Auto <-> Auto does not form a trunk
Desirable <-> Auto or Desirable does form a trunk