Selective QinQ is used to add outer VLAN tags to customer (inner-tagged) packets, enabling service identification and isolation in carrier networks.
✅ B – Supported: You can match on inner VLAN IDs to apply different outer VLAN tags.
✅ C – Supported: 802.1p priorities (inner VLAN CoS values) can be used as match criteria.
✅ D – Supported: You can apply QinQ behavior based on QoS policies using traffic classification.
❌ A is false – Selective QinQ does not use TTL (Time To Live) as a matching criterion. TTL is an IP-layer field and not used in L2 QinQ configurations.
✅ Official Reference from Huawei:
" Selective QinQ allows different outer VLAN tags to be added based on inner VLAN IDs, 802.1p priorities, and QoS policy rules. TTL values are not used as matching conditions. "
— [Huawei HCIA-Datacom Certification Guide – VLAN and QinQ Chapter]
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