The VLAN switching plan of the Internet service in a project adopts the translate method, and the C-VLAN ID and S-VLAN ID need to be consistent during planning.

Question

Options

• ATRUE
• BFALSE

• A
  24% (11)
• B
  76% (35)

Explanation

Option B is correct because the translate method is specifically designed to map C-VLAN IDs to different S-VLAN IDs - that remapping is its core function. If C-VLAN and S-VLAN IDs were required to match, there would be no practical difference between translate and a simple transparent/pass-through approach. ISPs use VLAN translation precisely to resolve overlapping customer VLAN IDs and assign their own internal S-VLAN numbering independently of what the customer uses.

Why A is wrong: Requiring C-VLAN = S-VLAN would eliminate the flexibility that makes the translate method valuable. Customers from different enterprises often reuse the same VLAN IDs (e.g., VLAN 10), and the translate method lets the provider assign unique S-VLANs to each without coordinating with the customer.

Memory tip: Think of "translate" like a language translator - the input word (C-VLAN) and the output word (S-VLAN) are different forms of the same meaning. If they were identical, no translation would be needed. Whenever you see "translate method," immediately associate it with different IDs on each side.

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