VLAN conversion on the user side is generally performed on the MA5680T service board. What are the methods for VLAN conversion?

Question

Options

• Atransparent
• Btranslate
• Cadd-double
• Dtranslate-and-transparent

• A
  80% (37)
• D
  20% (9)

Explanation

On Huawei's MA5680T, the service board supports exactly three VLAN conversion methods: transparent (passes the customer VLAN tag through unchanged), translate (swaps the customer VLAN ID for a different one, enabling re-mapping between user and network VLANs), and add-double (stacks a second outer VLAN tag on top of the existing one, commonly known as QinQ/802.1ad, used to aggregate multiple customer VLANs into a single service VLAN). These three represent the complete, vendor-defined set of conversion modes for this platform.

Option D (translate-and-transparent) is incorrect because it is not a valid, standalone VLAN conversion mode on the MA5680T - it conflates two separate methods into a non-existent hybrid option, making it a classic exam distractor designed to catch candidates who are guessing.

Memory tip: Use the acronym "TTA" - Transparent, Translate, Add-double - to recall all three valid methods. Think of them as increasing levels of tag manipulation: touch nothing, swap the tag, add a tag.

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