CCNA3 Exploration Chapter 4. Study questions.

4.1
What is the purpose of VTP? To make the management of VLANs easier by allowing switches to learn about VLANs from each other. What sort of link between switches is needed to transmit VTP advertisements? A trunk link. What are the three VTP modes that a switch could take? Server, client and transparent. What name is given to a group of switches that share VLAN information using VTP? A VTP domain. Which VTP modes allow switches to save VLAN information in the vlan database? Server mode switches store VLAN information for their domain. Transparent mode switches store information about their own VLANs. Which VTP versions can be used on a Catalyst 2960 switch, and which is the default version? Versions 1 and 2 can be used. Version 1 is the default. There is a version 3 that can be used on some switches, but no on the Catalyst 2960. How is a VTP domain identified? By its domain name. Which command is commonly used to display information about VTP? Show vtp status How is a VTP message encapsulated? It is encapsulated inside an Ethernet frame that is tagged using 802.1Q or ISL.

SW

12/4/2011

77737991.doc

1

What destination MAC address is used for VTP messages? The multicast address 01-00-0C-CC-CC-CC What does a server switch do to the configuration revision number when a new VLAN is added? Increases it by 1. so it needs to obtain VLAN information from a server switch in its domain. What does it do? It sends out a VTP request advertisement and receives information in a subset advertisement from the server. or when the VLAN configuration is changed. What does it do? It will forward the summary advertisement to any other switches. How does it obtain VLAN information? It does not have any vlan database of its own.doc 2 . A client switch is reset. A client switch receives a summary advertisement with a lower configuration revision number than its own. What is the purpose of including the configuration revision number in a VTP advertisement? It shows the receiving switch whether the advertisement contains more up to date information than the information that it already has. A client switch receives a summary advertisement with a higher configuration revision number than its own. A transparent switch receives a summary advertisement. SW 12/4/2011 77737991. What does it do? It will forward the summary advertisement to other switches but ignore its contents. How often does a switch send out summary advertisements? Every 5 minutes. There is no newer VLAN information available. It sends out a VTP request advertisement and receives information in a subset advertisement from the server. Which type of VTP advertisement contains information about VLANs? The subset advertisement. but do nothing else about it.

What happens to the vtp configuration revision number of a switch if you change its vtp domain name? It is reset to the default value of 0. Which command will make a switch into a VTP client? vtp mode client If VTP is not working correctly.Which modes of switch will allow you to create new VLANs? Server switches (for the domain) and Transparent switches (for local use only).doc 3 . configure the VTP domain name or create the VLANs? Configure the domain name first because this will remove existing VLANs. Is it possible to have more than one server switch on a domain? Yes. What is the effect of giving the vtp pruning command on a server switch? VTP pruning is enabled for the whole domain. VLAN flood traffic will be sent only where it is needed – in the direction of devices on that VLAN. then the VLAN information would be lost. Is a transparent switch able to obtain VLAN information when it reboots? If the switch has any VLANs configured then they will be saved in the switch’s own VLAN database. The switch stays in transparent mode (assuming that the configuration has been saved. and they will be retrieved. Which should you do first on a server. Why might you want to change the domain name of a switch temporarily before adding it to an existing VTP domain? If the new switch has a configuration revision number of 0 then there is no danger of the new switch altering the VLAN information in the VTP domain and updating it with the wrong information. what should you check? SW 12/4/2011 77737991.) Does any VLAN configuration have to be carried out on a client switch? Switchports need to be assigned to VLANs. This is not done centrally. but is done on each switch. If there was only one server and it failed. It is a good idea to have more than one server.

Is it exactly the same on all switches? VTP Password if any. It needs to be the same on all switches in the domain.doc 4 . Better to have at least two. If you recently added a new switch.VTP Version. Domain name. had its revision number been set to 0? Is it possible to have a VTP domain where all the switches are in server mode? Yes. SW 12/4/2011 77737991. Is it exactly the same on all switches? Check that there is at least one server.