VTP & DTP Practice Questions

Answers and explanations appear when you work through the set above.

1. Which command sets a switch's VTP domain name, a prerequisite for VTP to actually synchronize VLAN information?

   • vtp domain <name>
   • vtp mode server
   • vtp password <name>
   • hostname <name>

2. A switch is configured in VTP transparent mode. What does this mean for its VLAN database?

   • It cannot have any VLANs configured at all
   • It forwards VTP advertisements between other switches but keeps and edits its own local VLAN database independently
   • It automatically becomes the VTP server for the domain
   • It deletes all VLANs whenever it receives an advertisement

3. Why would an administrator deliberately configure a switch in VTP client mode rather than server mode?

   • Client mode switches can create VLANs but cannot delete them
   • Client mode switches learn VLAN information from a server but are prevented from locally adding, deleting, or renaming VLANs, reducing the risk of accidental database changes
   • Client mode is required for switches with fewer than 24 ports
   • Client mode disables trunking on that switch

4. Which VTP field increases every time a VLAN is added, deleted, or renamed on a VTP server, and is used by other switches to decide whether to accept an advertisement?

   • The MD5 checksum
   • The configuration revision number
   • The domain name length
   • The VTP version

5. A switch that had previously been a VTP server in another domain, with a high configuration revision number, is added to a new production network still in client mode. What is the risk?

   • It has no effect since client mode switches cannot make changes
   • If its stale, higher revision number reaches an existing server, other switches may adopt its outdated VLAN database and wipe out the current VLANs
   • The switch will automatically reset its revision number to 0 upon joining
   • It will simply be ignored by other switches in transparent mode

6. Which command displays the current VTP mode, domain, configuration revision number, and number of existing VLANs on a switch?

   • show vtp status
   • show vlan brief
   • show vtp counters
   • show running-config vtp

7. What is the purpose of DTP (Dynamic Trunking Protocol)?

   • It synchronizes VLAN databases across switches
   • It negotiates whether a link between two switches becomes a trunk or stays an access link
   • It elects the spanning tree root bridge
   • It prevents VLAN hopping attacks

8. Two switchports are both set to switchport mode dynamic auto. What is the resulting link state?

   • The link becomes a trunk
   • The link stays in access mode, since neither side actively initiates trunk negotiation
   • The link is disabled until manually forced
   • The link negotiates to EtherChannel

9. Which command disables DTP negotiation messages on a port entirely, commonly recommended as a security hardening step on access ports?

   • switchport nonegotiate
   • switchport mode dynamic auto
   • no switchport trunk
   • vtp mode off

10. In VTP version 1 and 2, which VLAN range is NOT propagated by VTP, and must be configured manually on every switch that needs it?

    • VLANs 1 to 100
    • Extended range VLANs, 1006 to 4094
    • VLAN 1 only
    • The native VLAN only

11. An administrator wants to prevent VTP-related outages entirely across the whole campus. What is the most robust design choice?

    • Set every switch to VTP client mode so none can originate changes
    • Set every switch to VTP transparent mode, so each maintains its own independent VLAN database and no revision-number based overwrite can occur
    • Disable trunking on all switches
    • Use VTP version 1 instead of version 2