300-415 · Question #312
Which compression algorithm does DRE use in a Cisco SD-WAN environment?
The correct answer is A. Lempel-Ziv-Welch encoding. Data Redundancy Elimination (DRE) in a Cisco SD-WAN environment primarily uses the Lempel-Ziv-Welch (LZW) encoding algorithm for data compression.
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Options
- ALempel-Ziv-Welch encoding
- BHuffman encoding
- Crun-length encoding
- DZiv Huffman encoding
How the community answered
(44 responses)- A93% (41)
- B2% (1)
- C5% (2)
Why each option
Data Redundancy Elimination (DRE) in a Cisco SD-WAN environment primarily uses the Lempel-Ziv-Welch (LZW) encoding algorithm for data compression.
DRE in Cisco SD-WAN utilizes Lempel-Ziv-Welch (LZW) encoding, a dictionary-based lossless data compression algorithm that replaces repeated data patterns with shorter codes to reduce WAN bandwidth usage.
Huffman encoding is a lossless compression algorithm, but it is not the primary algorithm used by DRE for general data reduction in Cisco SD-WAN.
Run-length encoding (RLE) is a simpler lossless compression technique not as advanced as LZW for the broad data redundancy elimination performed by DRE.
Ziv Huffman encoding is not a standard or recognized compression algorithm; the Ziv family includes algorithms like LZ77 and LZ78, which are foundational to LZW.
Concept tested: DRE compression algorithm
Source: https://www.cisco.com/c/en/us/td/docs/routers/sdwan/configuration/policies/sdwan-policies-book/sdwan-data-compression.html
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