PVLAN (Private VLAN) defines three types of VLANs under the same SVI

Question

Options

• APrimary VLAN, Isolated VLAN and Customer VLAN
• BSecondary VLAN, Isolated VLAN and Provider VLAN
• CPrimary VLAN, Isolated VLAN and Community VLAN
• DProvider VLAN Service VLAN and QinQ VLAN

• A
  2% (1)
• B
  2% (1)
• C
  92% (46)
• D
  4% (2)

Explanation

C is correct because RFC-defined Private VLANs consist of exactly three types: a Primary VLAN (the overarching VLAN shared by all ports in the PVLAN domain), an Isolated VLAN (secondary VLAN where ports can only talk to the promiscuous/uplink port, never to each other), and a Community VLAN (secondary VLAN where ports can communicate with each other AND the promiscuous port, but not with other community or isolated ports).

Why the others are wrong:

• A swaps "Community VLAN" for "Customer VLAN" - Customer VLAN is a Q-in-Q (802.1ad) term, not a PVLAN type.
• B uses "Secondary VLAN" (an umbrella category covering both Isolated and Community) and "Provider VLAN" - again a Q-in-Q term, not PVLAN.
• D describes Q-in-Q/double-tagging terminology entirely (Provider, Service, QinQ VLANs) - a completely different technology.

Memory tip: Use the acronym PIC - Primary, Isolated, Community. Think of it as a building: the Primary is the building itself, Isolated tenants can't talk to neighbors, Community tenants can talk to each other on the same floor.

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