How many VC12 virtual TE links are supported by the same physical board or between two adjacent network elements?

Question

Options

• A1
• B4
• C8
• D2

• A
  17% (6)
• B
  69% (25)
• C
  6% (2)
• D
  8% (3)

Explanation

Option B (4) is correct because, in SDH/GMPLS-based transmission networks (particularly in implementations like Huawei's ASON architecture), a maximum of 4 VC12 virtual TE links can be configured on the same physical board or between two adjacent network elements. This limit reflects both hardware resource constraints on the board and protocol-level restrictions on how component links can be bundled into TE links for traffic engineering purposes.

Why the distractors are wrong:

• A (1) is too restrictive - allowing only one TE link would severely limit traffic engineering flexibility and wouldn't justify the bundling mechanism.
• C (8) exceeds the defined implementation limit; while larger containers (e.g., VC4) support different counts, VC12 specifically caps at 4.
• D (2) is a plausible-sounding answer but is not the specified limit - it may be confused with VC4-level constraints in some contexts.

Memory tip: Think of VC12 as a "quad" link - the number 4 matches the "four corners" of a 2 Mbit/s E1 channel group. You can also associate VC12 → 1+2 = 3, then +1 = 4, as a simple mnemonic to distinguish it from the distractor options of 2 and 8.

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