Home > VLAN Questions 4

VLAN Questions 4

November 24th, 2018 in SWITCH 300-115 Go to comments

Question 1

Question 2

Question 3

Explanation

Normal range VLANs are from 1 to 1005 (in which VLANs 1002 to 1005 are Cisco defaults for FDDI and Token Ring. You cannot delete these VLANs). Extended range VLANs are from 1006 to 4094.

Question 4

Question 5

Explanation

If VLAN 20 has not been created in the switch then the command “switchport access vlan 20” will automatically create this VLAN.

Question 6

Question 7

Explanation

You can configure an access port with an attached Cisco IP Phone to use one VLAN for voice traffic and another VLAN for data traffic from a device attached to the phone -> Therefore we can configure two VLANs in total.

Reference: https://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst2960/software/release/12-2_40_se/configuration/guide/scg/swvoip.pdf

Question 8

Explanation

Normal range VLANs are from 1 to 1005 (in which VLANs 1002 to 1005 are Cisco defaults for FDDI and Token Ring. You cannot delete these VLANs). Extended range VLANs are from 1006 to 4094. When you configure VLANs in VLAN database mode, the VLAN configuration is saved in the vlan.dat file, not the running-config or startup-config files.

When the switch is in VTP server or transparent mode, you can configure VLANs in the VLAN database mode.

Question 9

Explanation

VTPv3 supports for extended VLAN range (VLANs 1006 to 4094). VTP versions 1 and 2 only supports VLANs 1 to 1005. If extended VLANs are configured, we cannot convert from VTP version 3 to version 1 or 2. VTP version 3 saves extended-range VLANs in the VLAN database.

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

If you configure extended VLANs, you must also enable the spanning-tree extended system-ID feature (with the command “spanning-tree extend system-id”).

Reference: https://users.iit.uni-miskolc.hu/~szkovacs/HaloII/VLAN/ht_xvlan.pdf

Question 10

Question 11

Question 12

Explanation

CDP and VTP are always use VLAN 1 even if we change the native VLAN to another VLAN.

Comments
  1. ugurdy
    February 3rd, 2019

    Q1 is not correct. There is only one vlan.dat file on the switch and voice vlan in it. And also “B” could be correct, but it is not a MUST.

    B and D should be the correct answers.

  2. Renko
    February 27th, 2019

    @ugurdy

    I agree, you are right.

  3. Lik
    March 6th, 2019

    Q10
    B and C correct

    Untagged frames are tagged with the native VLAN ID of the trunk port before further processing. Only those egress frames whose VLAN tags are inside the allowed range for that 802.1Q trunk port are received. If the VLAN tag on a frame happens to match that of the native VLAN on the trunk port, the tag is stripped off and the frame is sent untagged.
    https://www.cisco.com/c/en/us/td/docs/switches/datacenter/nexus3000/sw/layer2/503_U2_1/b_Cisco_n3k_layer2_config_guide_503_U2_1/b_Cisco_n3k_layer2_config_gd_503_U2_1_chapter_0110.html

  4. NIC
    April 1st, 2019

    @ugurdy

    Did you get Q1 on the exam?

  5. ugurdy
    May 31st, 2019

    @NIC

    No, I didn’t take the exam yet, but the answer doesn’t make any sense. There is a single vlan database and it includes both voice vlan as well as data vlans.

  6. Z-A-M
    June 12th, 2019

    @ugurdy

    Agree with you.

  7. Anynomous CS
    June 29th, 2019

    My understanding for conclusion of tagging vs native VLAN:
    Normally, native isn’t tagged over trunk
    Unless the following command is set:
    Globally ( vlan dot1q tag native )
    Please confirm

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