CCNA 3 v6.0 (Scaling Networks v6) Chapter 2: Scaling VLANs: Check Your Understanding Questions Answers
1. Which statement is true when VTP is configured on a switched network that incorporates VLANs?
- VTP adds to the complexity of managing a switched network.
- VTP allows a switch to be configured to belong to more than one VTP domain.
- VTP dynamically communicates VLAN changes to all switches in the same VTP domain.
- VTP is only compatible with the 802.1Q standard.
Explanation: VTP propagates and synchronizes VLAN information to other switches in the VTP domain. There are currently three versions of VTP: VTPv1, VTPv2, and VTPv3.
2. What are two features of VTP client mode operation? (Choose two.)
- VTP clients can add VLANs of local significance.
- VTP clients can forward VLAN information to other switches in the same VTP domain.
- VTP clients can only pass VLAN management information without adopting
changes. - VTP clients can forward broadcasts out all ports with no respect to VLAN information.
- VTP clients are unable to add VLANs.
Explanation: VTP clients can only communicate with other switches in the same VTP domain. VTP clients cannot create, change, or delete VLANs. A VTP client only stores the VLAN information for the entire domain while the switch is on. A switch reset deletes the VLAN information. You must configure VTP client mode on a switch.
3. What does a client mode switch in a VTP management domain do when it receives a summary advertisement with a revision number higher than its current revision number?
- It deletes the VLANs not included in the summary advertisement.
- It increments the revision number and forwards it to other switches.
- It issues an advertisement request for new VLAN information.
- It issues summary advertisements to advise other switches of status changes.
- It suspends forwarding until a subset advertisement update arrives.
Explanation: If its own configuration revision number is higher or equal to the received configuration revision number, the packet is ignored. If its own configuration revision number is lower, an advertisement request is sent, asking for the subset advertisement message.
4. What causes a VTP-configured switch to issue a summary advertisement?
- A five-minute update timer has elapsed.
- A new host has been attached to a switch in the management domain.
- A port on the switch has been shut down.
- The switch is changed to transparent mode.
Explanation: By default, Cisco switches issue summary advertisements every five minutes. Summary advertisements inform adjacent VTP switches of the current VTP domain name and the configuration revision number.
5. Which three VTP parameters must be identical on all switches to participate in the same VTP domain? (Choose three.)
- Domain name
- Domain password
- Mode
- Pruning
- Revision number
- Version number
Explanation: To share VLAN information, all switches must use the same version of VTP, be in the same VTP domain, and use the same VTP password (if a password is configured).
6. Which two statements describe VTP transparent mode operation? (Choose two.)
- Transparent mode switches can add VLANs of local significance only.
- Transparent mode switches can adopt VLAN management changes that are received from other switches.
- Transparent mode switches can create VLAN management information.
- Transparent mode switches originate updates about the status of their VLANS and inform other switches about that status.
- Transparent mode switches pass any VLAN management information they receive to other switches.
Explanation: Transparent switches do not participate in VTP except to forward VTP advertisements to VTP clients and VTP servers. VLANs that are created, renamed, or deleted on transparent switches are local to those switches only. To create an extended VLAN, a switch must be configured as a VTP transparent switch when using VTP Versions 1 or 2.
7. Which two statements are true about the implementation of VTP? (Choose two.)
- Switches must be connected via trunks.
- Switches that use VTP must have the same switch name.
- The VTP domain name is case sensitive.
- The VTP password is mandatory and case sensitive.
- Transparent mode switches cannot be configured with new VLANs.
Explanation: VTP requires the use of trunk links. The VTP domain name, which is case sensitive, identifies the administrative domain for the switch. The VTP domain name is NULL by default.
8. A network administrator is replacing a failed switch with a switch that was previously on the network. What precautionary step should the administrator take on the replacement switch to avoid incorrect VLAN information from propagating through the network?
- Change all the interfaces on the switch to access ports.
- Change the VTP domain name.
- Change the VTP mode to client.
- Enable VTP pruning.
Explanation: To reset a configuration revision on a switch, change the VTP domain name. This resets the revision number to 0. Then change the name back to the original name, and it will acquire the current revision number from a VTP server.
9. Which two events cause the VTP revision number on a VTP server to change? (Choose two.)
- Adding VLANs
- Changing interface VLAN designations
- Changing the switch to a VTP client
- Changing the VTP domain name
- Rebooting the switch
Explanation: The VTP revision number is used to determine whether the received information is more recent than the current version. The revision number increases by 1 each time you add a VLAN, delete a VLAN, or change a VLAN name. If the VTP domain name is changed or the switch is set to transparent mode, the revision number is reset to 0.
10. How are VTP messages sent between switches in a domain?
- Layer 2 broadcast
- Layer 2 multicast
- Layer 2 unicast
- Layer 3 broadcast
- Layer 3 multicast
- Layer 3 unicast
Explanation: Each switch in the VTP domain sends periodic VTP advertisements from each trunk port to a reserved Layer 2 multicast address.
11. A router has two FastEthernet interfaces and needs to connect to four VLANs in the local network. How can this be accomplished using the fewest number of physical interfaces without unnecessarily decreasing network performance?
- Add a second router to handle the inter-VLAN traffic.
- Implement a router-on-a-stick configuration.
- Interconnect the VLANs via the two additional FastEthernet interfaces.
- Use a hub to connect the four VLANS with a FastEthernet interface on the router.
Explanation: Legacy inter-VLAN routing would require four FastEthernet interfaces. Therefore, the best routerbased solution is to configure a router-on-a-stick.
12. What distinguishes traditional legacy inter-VLAN routing from router-on-a-stick?
- Traditional routing is only able to use a single switch interface, while routeron-a-stick can use multiple switch interfaces.
- Traditional routing requires a routing protocol, while router-on-a-stick needs to route only directly connected networks.
- Traditional routing uses one port per logical network, while router-on-a-stick uses subinterfaces to connect multiple logical networks to a single router port.
- Traditional routing uses multiple paths to the router and therefore requires STP, while router-on-a-stick does not provide multiple connections and therefore eliminates the need for STP.
Explanation: Router-on-a-stick requires one interface configured as a subinterface for each VLAN.
13. What two statements are true regarding the use of subinterfaces for inter-VLAN routing? (Choose two.)
- Fewer router Ethernet ports are required than in traditional inter-VLAN routing.
- The physical connection is less complex than in traditional inter-VLAN routing.
- More switch ports are required than in traditional inter-VLAN routing.
- Layer 3 troubleshooting is simpler than with traditional inter-VLAN routing.
- Subinterfaces have no contention for bandwidth.
Explanation: Legacy (traditional) inter-VLAN routing requires more ports, and the configuration can be more complex than with a router-on-a-stick solution.
14. What is important to consider while configuring the subinterfaces of a router when implementing inter-VLAN routing?
- The IP address of each subinterface must be the default gateway address for each VLAN subnet.
- The no shutdown command must be run on each subinterface.
- The physical interface must have an IP address configured.
- The subinterface numbers must match the VLAN ID number.
Explanation: The host must have a default gateway configured. Hosts on VLANs must have their default gateway configured on a router subinterface to provide inter-VLAN routing services.
15. What steps must be completed in order to enable inter-VLAN routing using router-on-a-stick?
- Configure the physical interfaces on the router and enable a routing protocol.
- Create the VLANs on the router and define the port membership assignments on the switch.
- Create the VLANs on the switch to include port membership assignment and enable a routing protocol on the router.
- Create the VLANs on the switch to include port membership assignment and configure subinterfaces on the router matching the VLANs.
Explanation: The switch port must be configured as a trunk, and the VLANs on the switch must have users connected to them.