TLV is an important data structure in IS-IS. Which of the following does it represent?

Question

Options

• ATime, Length and Volume
• BTime, Level and Value
• CType, Length and Volume
• DType, Length and Value

• A
  19% (7)
• B
  5% (2)
• C
  3% (1)
• D
  73% (27)

Explanation

Type, Length, and Value is the correct expansion of TLV - a foundational encoding scheme used in IS-IS (and many other protocols) where each data element is structured as a type code (identifying what kind of data follows), a length field (how many bytes the value occupies), and the actual value payload. Options A, B, and C are all wrong because "Time" and "Volume" are not components of this structure - TLV has nothing to do with time or volume, and "Level" (option B) conflates TLV with IS-IS's Level-1/Level-2 hierarchy concept, which is a separate idea. Option C gets "Type" right but substitutes "Volume" for "Value," which is nonsensical in a data encoding context. A reliable memory tip: think "TV shows have Type and Value" - the L in the middle is just the Length that tells you how big the Value is.

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