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VLAN Questions

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

Question 1

Explanation

The Port Fast feature is automatically enabled when voice VLAN is configured. When you disable voice VLAN, the Port Fast feature is not automatically disabled.

Reference: http://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst3550/software/release/12-1_19_ea1/configuration/guide/3550scg/swvoip.html

Question 2

Explanation

802.1Q VLAN frames are distinguished from ordinary Ethernet frames by the insertion of a 4-byte VLAN tag into the Ethernet header.

802.1q_header.png

Question 3

Explanation

Because the 802.1Q tunneling feature increases the frame size by 4 bytes when the metro tag is added, you must configure all switches in the service-provider network to be able to process maximum frames by increasing the switch system MTU size to at least 1504 bytes.

Question 4

Explanation

The VLAN ID field inside an 802.1q frame consists of 12 bits. Therefore we have 212 = 4096 VLAN IDs, theoretically.

802.1q_header.png

Question 5

Explanation

Each access port can be only assigned to one VLAN via the “switchport access vlan ” command.

Question 6

Explanation

This command is used to enable tagging of native VLAN frames on all 802.1Q trunk ports.

Answer A is not correct because even when the native VLAN is set to 1, all of the frames of the native VLAN are tagged.

Answer B is not correct because the control traffic still passes via the default VLAN (VLAN 1).

Answer C is not correct because all the frames are tagged with 4-byte dot1Q tag.

Answer D is not correct as “Control traffic continues to be accepted as untagged on the native VLAN on a trunked port, even when the vlan dot1q tag native command is enabled” according to this link: https://www.cisco.com/c/m/en_us/techdoc/dc/reference/cli/nxos/commands/l2/vlan-dot1q-tag-native.html

Question 7

Explanation

When you delete a VLAN, any LAN ports configured as access ports assigned to that VLAN become inactive. The ports remain associated with the VLAN (and inactive) until you assign them to a new VLAN.

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

Question 8

Explanation

The PortFast feature is automatically enabled when voice VLAN is configured. When you disable voice VLAN, the PortFast feature is not automatically disabled.

Question 9

Question 10

Comments
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  1. Muhamad
    March 15th, 2019

    Pass on 13th march. My lab is HRSP and AAA dot1q. you should study them well.
    Few new questions, dump valid. Thanks certprepare!

    ====
    My email: muhamadawan1988(at)gmail(dot)com

  2. supportdonkey
    March 24th, 2019

    Muhamad is a fake! He just wants to sell dumps!

  3. elric
    March 30th, 2019

    Hi,
    Any body can help me the valid dump to dani_edi29 hotmail dot com as I will sit for exam this week.Thanks in advance!!

  4. NIC
    April 1st, 2019

    Did anybody get the answer for Q4? IsnĀ“t it 32?

  5. NIC
    April 1st, 2019

    So, what is the answer for Q6?

  6. couldbe
    April 5th, 2019

    Use the vlan dot1q tag native global configuration command to configure the edge switch so that all packets going out an IEEE 802.1Q trunk, including the native VLAN, are tagged. Has to be used on IEEE 802.1Q Tunneling Port – QinQ.

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