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VTP Questions 3

September 15th, 2017 in SWITCH 300-115 Go to comments

Question 1


During switch boot up, the switch compares the content in the vlan.dat file and the configuration in startup-config to determine if it should use the configuration in vlan.dat or startup-config. When you save VTP mode, domain name, and VLAN configurations in the switch startup configuration file and reboot the switch, the VTP and VLAN configurations are selected by these conditions:
+ If both the VLAN database and the configuration file show the VTP mode as transparent and the VTP domain names match, the VLAN database is ignored. The VTP and VLAN configurations in the startup configuration file are used. The VLAN database revision number remains unchanged in the VLAN database.
+ If the startup VTP mode is server mode, or the startup VTP mode or domain names do not match the VLAN database, VTP mode and VLAN configuration for the first 1005 VLANs are selected by VLAN database information, such as the vlan.dat file. VLANs greater than 1005 are configured from the switch configuration file (startup-config file).

Reference: http://www.cisco.com/c/en/us/support/docs/switches/catalyst-2940-series-switches/109304-manage-vlandat.html

Question 2

Question 3

Question 4


VTP pruning should only be enabled on VTP servers, all the clients in the VTP domain will automatically enable VTP pruning -> C is correct.

Question 5

Question 6


In addition to propagating VTP information, version 3 can propagate Multiple Spanning Tree (MST) protocol database information. A separate instance of the VTP protocol runs for each application that uses VTP -> Only VTPv3 supports multiple VTP instances -> Answer A is not correct.

VTP version 1 and version 2 support only normal-range VLANs (VLAN IDs 1 to 1005). VTP version 3 supports the entire VLAN range (VLANs 1 to 4094). Extended range VLANs (VLANs 1006 to 4094) are supported only in VTP version 3. You cannot convert from VTP version 3 to VTP version 2 if extended VLANs are configured in the domain.

Only VTPv3 allows to turn on/off per-port basis -> Answers C, E are not correct.

Consistency Checks: In VTP version 2, VLAN consistency checks (such as VLAN names and values) are performed only when you enter new information through the CLI or SNMP. Consistency checks are not performed when new information is obtained from a VTP message or when information is read from NVRAM. Therefore answer D is not correct.

Reference: https://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst3560/software/release/12-2_52_se/configuration/guide/3560scg/swvtp.html

Question 7


In VTP versions 1 and 2, the switch must be in VTP transparent mode when you create extended-range VLANs. VTP version 3 also supports creating extended-range VLANs in client or server mode -> Answer A is correct.

Reference: https://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst3560/software/release/12-2_52_se/configuration/guide/3560scg/swvtp.html

Extended-range VLANs range from 1006-4094, inclusive. However, if using VTPv1 or VTPv2, these additional VLANs cannot be configured in VLAN database mode, nor stored in the vlan.dat file, nor advertised through VTP (so answer E is not correct). In fact, to configure them, the switch must be in VTP transparent mode. VTPv3 removes these limitations: Both normal- and extended-range VLANs can be advertised by VTPv3. Also, with VTPv3, information about all VLANs is again stored in the vlan.dat file in Flash -> Therefore VTPv3 stores the extended-range VLAN in VLAN database (vlan.dat file).

Reference: CCIE Routing and Switching v5.0 Official Cert Guide, Volume 1, Fifth Edition

VLAN 1 and VLANs 1002 to 1005 are always pruning-ineligible; traffic from these VLANs cannot be pruned. Extended-range VLANs (VLAN IDs greater than 1005) are also pruning-ineligible -> Answer D is correct.

Reference: https://www.cisco.com/c/en/us/support/docs/lan-switching/vtp/10558-21.html

  1. mikeSWE
    July 19th, 2017

    @Certprepare please confirm q1 here. URGENT exam in 2 days

    Different dumps are all saying B and D is the correct answer

  2. Anonymous
    July 27th, 2017

    A and D

    August 2nd, 2017
  4. BoZZ
    August 14th, 2017

    Question 2 – C and E, not A as password is hidden or secret not hashed nor D as VTPv3 msgs are not encrypted.


  5. Bahati
    September 7th, 2017

    Is the answer here B and C

  6. molesys
    October 2nd, 2017

    can someone explain why in question 5 the answer is “A” and not ” C. VLANs 1 through 9 are pruned on the link between SW1 and SW4 ” ???

  7. molesys
    October 2nd, 2017

    Now I know why!!!, VTP pruning increases available bandwidth by restricting flooded traffic to those trunk links that the traffic must use to access the appropriate network devices. VLAN1 is always ineligible for pruning; traffic from VLAN1 cannot be pruned.

  8. switchy
    October 15th, 2017

    Q5 Can someone explain why the answer is not “A”?

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