Which of the following boards supports QinQ function?

Question

Options

• AEFT8
• BEGT2
• CEMS4
• DEMR2

• A
  16% (8)
• B
  10% (5)
• C
  71% (36)
• D
  4% (2)

Explanation

EMS4 is correct because it is a multi-service Ethernet board (found in Huawei OSN transmission equipment) designed for carrier-grade Ethernet services, which includes QinQ (IEEE 802.1ad) - the ability to stack an outer provider VLAN tag over a customer VLAN tag to tunnel traffic across a service provider network.

EFT8 is an Ethernet fixed transport board optimized for basic Ethernet frame transport without the service-layer flexibility needed for QinQ encapsulation. EGT2 is a GE-focused transport board oriented toward pure Gigabit Ethernet forwarding, lacking the multi-service processing required for double-tagging. EMR2 is oriented toward Ethernet resilience/multi-ring scenarios and does not include QinQ as a supported feature.

Memory tip: The "M" in EMS4 stands for Multi-service - QinQ is a service provider feature that stacks VLANs, so look for the board with the most service-layer capability. If a board name contains "MS," it's your best candidate for advanced Ethernet service features like QinQ.

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