VTP Flashcards
What is the purpose of the VTP client advertisement request?
It allows a client device to request VTP summary and subset advertisement from the server.
What does the VTP summary advertisement carry?
Synchronization information. Domain name, CRN, VTP version, MD5 hash code, timestamp, and the number of subset advertisements to follow.
What does the VTP subset advertisement carry?
Updated VLAN information.
What is VTP Pruning?
If a VLAN is not present on any ports on a switch, VTP will automatically remove that VLAN from trunks leading to that switch.
VTP version 3 introduced ___, ___. ___ and ___.
The “off” mode, the primary server, encrypted passwords and support for all VLANs.
List the VTP versions.
Versions 1, 2 and 3. 1 is ran by default.
List the three VTP advertisement types.
Summary advertisements, subset advertisements, client advertisement requests.
In VTP, client devices can still make changes when they send a ___.
Full summary advertisement.
Define the CRN.
Configuration revision number. In VTP, the advertisement with the highest CRN is used. The CRN is incremented on a switch whenever a VLAN change is made.
List the VTP roles.
Server, client, transparent, off.
To participate in VTP, devices must be part of the same ___ and have the correct ___.
VTP domain and VTP password.
Briefly describe VTP.
VLAN trunking protocol. Replicates VLANs across devices in a whole network.
Which command will show VTP config information?
Show VTP status
Each switch can only be in one ___.
VTP domain.
What VTP version do switches run in by default?
VTP version 1.
What is the default VTP domain?
“Null”. Will still run VTP.
Are VTP domains case sensitive?
Yes.
Describe the VTP server mode.
The switch will send out VTP subset advertisements. Only one serve is allowed in later VTP versions.
Describe the VTP client mode.
The switch will listen for VTP subset advertisements and update it’s VLANs accordingly.
Describe the VTP transparent mode.
The switch will ignore VTP packets but will forward them along.
Describe the VTP off mode.
The switch will ignore VTP packets and will not forward them. Only available in version 3.
Will a client switch ever send a VTP advertisement?
Yes, when it first boots and enters a domain. This can affect the network.
What port types are VTP advertisements sent over?
Trunk ports.
When is a VTP summary advertisement sent?
Every 5 minutes or whenever any changes are made to the VLAN database.
What happens when the CRN for an advertisement matches the CRN of the recieving switch?
The advertisement will be rejected.
The CRN is incremented ___ the VTP advertisement is sent.
Before.
What are two ways to reset the CRN number?
Change the VTP domain to a non-existent domain and then change it back; change the VTP mode to transparent and then back. ALWAYS VERIFY.
When are subset advertisements sent?
Whenever a change to the VLAN database is made.
Can local VLAN changes be made to a VTP mode client device?
No, changes can only be made on a server, transparent, or off mode device.
When would a VTP client advertisement request be needed?
When the client device’s VLAN database is corrupted or deleted.
What’s the difference between transparent mode in version 1 and 2?
In version 1 transparent mode will only forward VTP advertisements within its own domain, in version 2 transparent mode will forward all VTP advertisements.
VTP version 3 allows you to configure VTP on a ___ by ___ basis.
Port by port.
In VTP versions 1 and 2, which file can the VTP password be viewed in?
the VLAN.dat file. This was fixed in VTP version 3.
How does VTP version 3 fix the VTP synch issue?
With the introduction of the primary server. Only the primary server can make changes to other switch’s VLAN databases.
How do you make a switch the primary VTP server?
With the “VTP primary” command.
Which VLAN are VTP advertisements sent across?
The untagged VLAN.
Which VTP versions are compatible?
VTP versions 2 and 3 are “compatible”. VTP version 1 is not compatible with any other version.
What’s the command to enable VTP pruning?
“VTP pruning” from global config mode. Can be edited on a port-by-port basis.
