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VTP Questions

November 23rd, 2019 Go to comments

Question 1

Explanation

VTP updates can only be forwarded on trunk links.

Question 2

Explanation

VTP version 1 and version 2 support VLANs 1 to 1000 only. Extended-range VLANs are supported only in VTP version 3. If converting from VTP version 3 to VTP version 2, VLANs in the range 1006 to 4094 are removed from VTP control.

Reference: http://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst6500/ios/12-2SX/configuration/guide/book/vtp.html

Question 3

Explanation

VTP Pruning makes more efficient use of trunk bandwidth by forwarding broadcast and unknown unicast frames on a VLAN only if the switch on the receiving end of the trunk has ports in that VLAN. In the below example, Server switch doesn’t send broadcast frame to Sw2 because Sw2 doesn’t have ports in VLAN 10.

VTP_Pruning_Enabled.jpg

Question 4

Explanation

Switch C can receive VLAN information from Switch A so Switch B can forward it to Switch C without updating its VLAN database -> Switch B is in VTP transparent mode.

Question 5

Explanation

VTP updates can only be forwarded on trunk links.

Question 6

Explanation

VTP version 1 and version 2 support VLANs 1 to 1000 only. Extended-range VLANs are supported only in VTP version 3. If converting from VTP version 3 to VTP version 2, VLANs in the range 1006 to 4094 are removed from VTP control.

Reference: http://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst6500/ios/12-2SX/configuration/guide/book/vtp.html

Question 7

Explanation

VTP Pruning makes more efficient use of trunk bandwidth by forwarding broadcast and unknown unicast frames on a VLAN only if the switch on the receiving end of the trunk has ports in that VLAN

Question 8

Explanation

VTP version 1 and version 2 support VLANs 1 to 1000 only. Extended-range VLANs are supported only in VTP version 3. If converting from VTP version 3 to VTP version 2, VLANs in the range 1006 to 4094 are removed from VTP control.

Question 9

Explanation

If a VTP client or server with a null domain receives a VTP message with the domain populated, it will assume the domain of the received message and add applicable VLANs to its database.

Question 10

Explanation

With VTP version 1 and version 2, when the switch is in VTP transparent mode (VTP disabled), you can create extended-range VLANs (in the range 1006 to 4094)

Comments
  1. anon
    January 11th, 2020
  2. flkang
    January 29th, 2020

    regarding Q8
    Answer B
    Anonymous is correct! I’ve checked in the official book.

    VTP v1 and v2 support vlans from 1 to 1005

    Being 1002-1005 reserved, so 1001 Vlan IDs left for user traffic

  3. suntzu
    February 8th, 2020

    Normal-range VLANs are VLANs with VLAN IDs 1 to 1005. If the switch is in VTP server or VTP transparent mode, you can add, modify or remove configurations for VLANs 2 to 1001 in the VLAN database. (VLAN IDs 1 and 1002 to 1005 are automatically created and cannot be removed.)

    Vlan 1 THROUGH vlan 1001 can be used for user traffic. Even THOUGH vlan 1 is native, it can still carry user traffic.

    VTP version 1, 2 or 3. (This question does not speak about extended vlans)
    User traffic can be carried on vlan 1 – 1001.
    You can configure or remove 2 – 1001

    If questions asked which ones you remove/configure then consider using the 2-1001.
    If it asks about traffic being carried then consider using 1-1001.

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