Which compression algorithm does DRE use in Cisco SD-WAN?
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Correct answer: Lempel-Ziv-Welch encoding.
Why this is the answer
Data Redundancy Elimination (DRE) in Cisco SD-WAN utilizes the Lempel-Ziv-Welch (LZW) encoding algorithm. LZW is a dictionary-based compression algorithm that identifies repeating patterns in data and replaces them with shorter codes, making it highly effective for reducing redundant data across WAN links. This improves bandwidth utilization and application performance. Huffman encoding is a variable-length coding scheme often used for lossless data compression, but it's not the primary algorithm for DRE in Cisco SD-WAN. Run-length encoding is simpler and best suited for data with long sequences of identical characters, which is less common for general network traffic. Ziv Huffman encoding is not a standard or recognized compression algorithm.
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