To facilitate subsequent management, a university wants to use double-tagged VLANs. The inner VLAN tag is used to identify users, and the outer VLAN tag is used to identify services. Which VLAN attribute should be used?
Double-tagging involves adding two VLAN tags to a packet:
Inner VLAN Tag : Identifies users or devices.
Outer VLAN Tag : Identifies services or networks.
VLAN Attributes :
QinQ : Adds an outer VLAN tag to an already tagged packet, enabling double-tagging.
Stacking : Similar to QinQ but less commonly used.
Common : Supports only single-tag VLANs.
Scenario Analysis :
The university requires double-tagging for user and service identification.
The QinQ attribute is specifically designed for this purpose.
Why C?
The QinQ attribute supports double-tagging, making it the correct choice for this scenario.
Thus, the correct answer is C .
References:
HCIA Huawei ACCESS Official Documentation , Chapter: VLAN Design.
IEEE 802.1ad QinQ Standards .
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