Which two statements are true about VLANs and port groups defined on a vSphere Standard Switch? (Choose two

Which two statements are true about VLANs and port groups defined on a vSphere Standard Switch? (Choose two.)

A.
A VLAN can be accessed by the entire virtual switch or individual port groups.

B.
Multiple port groups are restricted from accessing the same VLAN.

C.
VLANs can be configured only on individual port groups.

D.
Multiple VLANs can be accessed by virtual machines connected to one port group.

10 Comments on “Which two statements are true about VLANs and port groups defined on a vSphere Standard Switch? (Choose two

    1. Bart says:

      I think D is correct, because using the VLAn ID 4095 makes all VLANs available.

      Networking Guide gives the following information. I believe it is not new for vSphere5.

      (Optional) If you are using a VLAN, for VLAN ID, enter a number between 1 and 4094. If you are not using a VLAN, leave this blank.

      If you enter 0 or leave the option blank, the port group can see only untagged (non-VLAN) traffic. If you enter 4095, the port group can see traffic on any VLAN while leaving the VLAN tags intact.

  1. Markitty says:

    I think B is the ONLY one that can be ruled out 100%. All of the others can be true, given certain configurations. VLANs are only configured at the port group level, and you can have the same VLAN to multiple port groups of the same switch, thus the entire switch can access the same VLAN. I understand that D is true is VLAN 4095 is configured.

    But, can anyone tell me how you can rule out C???

  2. none says:

    C is not correct, if you configure the port group as 4095 (all) then VLANs can be configured at VM level (with the proper driver)

    1. Tony says:

      Yes, but the question is stated in terms or port groups and standard switches. Answer “C” reads as “it cannot be configured on multiple port groups or on the entire switch”. Quite confusing …

    2. villamonteboy says:

      I have been confused with option C for quite a while but after reading your explanation, it is very clear that VLANs can also be configured also on the VM level.

      This makes C incorrect.

      thanks

  3. adam turner says:

    There are about 5 or 6 questions in the VCP 510 that are extraordinarily vague, and have counterpart questions that are just as vague with slight verbage changes that totally alter the correct questions.

    In this question, D is correct because a VM can indeed _access_ multiple VLANsif 4095 is configured as the VLAN.

    In this question (https://www.aiotestking.com/vmware/2011/10/which-two-statements-are-true-about-port-groups-and-vlans-defined-on-a-vnetwork-standard-switch/), however, the similar answer is changed to “multiple vlans can be _specified_ in a single port group”. This, actually, can not be done. You can allow all vlans (better described as passthrough), or a single VLAN. You _cannot_, _specify_ for instance VLAN 2, 5, and 23.

    At least thats how I’m trying to memorize it for the test. Regardless of the accuracy, self-justification is needed for you to recall the differences in the two answers depending on which one you get, as the question itself doesn’t change much outside of “vSphere standard switch” vs. “vNetwork standard switch”, which I believe is just semantics.


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