CCNA 200-125 Exam: VTP Questions With Answers

  1. Which protocol supports sharing the VLAN configuration between two or more switches?
    • A. multicast
    • B. STP
    • C. VTP*
    • D. split-horizon

    Show (Hide) Explanation/Reference
    With VTP, switches can learn VLAN configuration of other switches dynamically.
  2. How to enable VLANs automatically across multiple switches?
    • A. Configure VLAN
    • B. Confiture NTP
    • C. Configure each VLAN
    • D. Configure VTP*

    Show (Hide) Explanation/Reference
    VLAN Trunking Protocol (VTP) allows a network manager to configure a switch so that it will propagate VLAN configurations to other switches in the network automatically.
  3. Which VTP mode can not make a change to vlan?
    • A. Server
    • B. Client*
    • C. Transparent
    • D. Off

    Show (Hide) Explanation/Reference
    Only VTP Client cannot make a change to VLAN.
  4. Which DTP switch port mode allows the port to create a trunk link if the neighboring port is in trunk mode, or desirable auto mode?
    • A. Dynamic auto*
    • B. Trunk
    • C. Dynamic desirable
    • D. Access

    Show (Hide) Explanation/Reference
    The Dynamic Trunking Protocol (DTP) is a proprietary networking protocol developed by Cisco for the purpose of negotiating trunking on a link between two switches, and for negotiating the type of trunking encapsulation to be used.

    In dynamic auto mode, the interface is able to convert the link to a trunk link. The interface becomes a trunk interface if the neighboring interface is set to trunk or desirable mode. The default switchport mode for newer Cisco switch Ethernet interfaces is dynamic auto. Note that if two Cisco switches are left to the common default setting of auto, a trunk will never form.

    In dynamic desirable mode, the interface actively attempt to convert the link to a trunk link. The interface becomes a trunk interface if the neighboring interface is set to trunk, desirable, or auto mode. This is the default switchport mode on older switches, such as the Catalyst 2950 and 3550 Series switches -> This is the best answer in this question.


  5. To configure the VLAN trunking protocol to communicate VLAN information between two switches, what two requirements must be met? (Choose two)
    • A. Each end of the trunk line must be set to IEEE 802.1E encapsulation.
    • B. The VTP management domain name of both switches must be set the same.*
    • C. All ports on both the switches must be set as access ports.
    • D. One of the two switches must be configured as a VTP server.*
    • E. A rollover cable is required to connect the two switches together.
    • F. A router must be used to forward VTP traffic between VLANs.

    Show (Hide) Explanation/Reference
    In Cisco switches there are two encapsulations: 802.1q and ISL so we can set two ends to ISL instead -> A is not correct.

    The ports between two switches must be set to trunk ports so that they can exchange VLAN information through VTP -> C is not correct.

    To connect two switches we can use cross-over cable or straight-through cable (because modern Cisco switches can “auto-sense”) but not rollover cable -> E is not correct.

    To forward traffic in the same VLAN (between two or more switches) we can use switches only. If we want to forward VTP traffic between different VLANs we can use either a router or a Layer 3 switch -> F is not correct.

    Two switches can only communicate when they are set to the same VTP domain name (and the same VTP password) -> B is correct.

    One of the two switches must be set to VTP Server so that it can create VTP updates and advertise its VLAN information.

  6. What are the requirements for running VTP? (Choose two)
    • A. VTP domain names must be different
    • B. VTP domain names must be the same*
    • C. VTP server must have the highest revision numbers
    • D. All devices need to have the same VTP version*

    Show (Hide) Explanation/Reference
    VTP server usually has the same revision number with other switches (when they are synchronized) so answer C is not correct. To run VTP, the VTP domain names and VTP version must be matched among the devices running VTP.

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