If VLAN 20 is bound to an interface tagged in an environment where a Citrix ADC is configured with default settings, which VLAN(s) will be bound to that interface?

Question

Options

• AVLAN 1 tagged and VLAN 20 tagged
• BVLAN 20 untagged
• CVLAN 1 untagged and VLAN 20 tagged
• DVLAN 20 tagged

• A
  6% (3)
• B
  2% (1)
• C
  90% (44)
• D
  2% (1)

Explanation

On a Citrix ADC with default settings, every interface is automatically bound to VLAN 1 as untagged - this membership persists even when you add other VLANs. When you bind VLAN 20 as tagged, the interface ends up with both: VLAN 1 (untagged, always present by default) and VLAN 20 (tagged, explicitly added), making C correct.

Why the distractors fail:

• A is wrong because VLAN 1 is untagged by default, not tagged - tagging VLAN 1 requires an explicit configuration change.
• B is wrong on two counts: binding a VLAN as "tagged" keeps it tagged, and it ignores the persistent VLAN 1 untagged membership.
• D is wrong because it omits VLAN 1 - the default untagged VLAN doesn't disappear just because another VLAN is added.

Memory tip: Think of VLAN 1 as a "shadow roommate" on every Citrix ADC interface - it's always there untagged by default and refuses to leave unless you explicitly remove it. Any tagged VLAN you add just moves in alongside it.

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