COMPUTER CERTIFICATION

Passing the BCMSN exam and getting one step closer to the CCNP certification means learning and noticing details that you were not presented with in your CCNA studies. (Yes, I know – you had more than enough details then, right?)   One protocol you’ve got to learn more details about is VTP, which seemed simple enough in your CCNA studies!  Part of learning the details is mastering the fundamentals, so in this tutorial we’ll review the basics of VTP. In show vtp status readouts, the "VTP Operating Mode" is set to "Server" by default.  The more familiar term for VTP Operating Mode is simply VTP Mode, and Server is the default.  It's through the usage of VTP modes that we can place limits on which switches can delete and create VLANs. In Server mode, a VTP switch can be used to create, modify, and delete VLANs.  This means that a VTP deployment has to have at least one switch in Server mode, or VLAN creation will not be possible.  Again, this i...

CCNA and CCNP candidates who have their own Cisco home labs often email me about an odd situation that occurs when they erase a switch's configuration.  Their startup configuration is gone, as they expect, but the VLAN and VTP information is still there! Sounds strange, doesn't it?   Let's look at an example.  On SW1, we run show vlan brief and see in this abbreviated output that there are three additional vlans in use: SW1#show vlan br 10   VLAN0010                         active 20   VLAN0020                         active 30   VLAN0030                         active We want to totally erase the router's startup configuration, so we use the write erase command, confirm it, and reload without saving the running config:...