At a certain UA5000 site, due to resource constraints, the entire frame of ADSL users need to pass a VLAN upstream to the IP network. At this time, why should the upstream VLAN in the IPM board be…

Question

Options

• Astandard vlan;
• Bsmart vlan;
• Cmux vlan;
• Dsuper vlan

• A
  7% (2)
• B
  77% (23)
• C
  13% (4)
• D
  3% (1)

Explanation

Smart VLAN is correct because, in a resource-constrained UA5000 deployment, it enables multiple ADSL users across an entire frame to share a single upstream VLAN ID on the IPM board - a classic N:1 mapping. This is precisely the Huawei-defined VLAN type built for aggregating many subscribers into one upstream VLAN without assigning individual VLANs per user.

Why the distractors fail:

• A (Standard VLAN): Would require one VLAN per user or group, quickly exhausting VLAN resources - the opposite of the constrained scenario described.
• C (MUX VLAN): Used for port isolation within a VLAN (e.g., separating users who share a VLAN from communicating with each other), not for upstream aggregation of subscriber traffic.
• D (Super VLAN): A Layer 3 concept (VLAN aggregation) that conserves IP addresses by grouping sub-VLANs under one gateway interface - it addresses IP scarcity, not upstream VLAN resource constraints.

Memory tip: Think of it this way - when resources are tight, you need a smart solution. Smart VLAN = Smart sharing: many users, one upstream VLAN ID, no waste.

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