300-415 Question #312: Real Exam Question with Answer & Explanation

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.

Policies

Question

Which compression algorithm does DRE use in a Cisco SD-WAN environment?

Options

ALempel-Ziv-Welch encoding
BHuffman encoding
Crun-length encoding
DZiv Huffman encoding

Explanation

Data Redundancy Elimination (DRE) in a Cisco SD-WAN environment primarily uses the Lempel-Ziv-Welch (LZW) encoding algorithm for data compression.

Common mistakes.

B. 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.
C. Run-length encoding (RLE) is a simpler lossless compression technique not as advanced as LZW for the broad data redundancy elimination performed by DRE.
D. 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

Reference. https://www.cisco.com/c/en/us/td/docs/routers/sdwan/configuration/policies/sdwan-policies-book/sdwan-data-compression.html

Topics

#SD-WAN#Data Redundancy Elimination#Compression Algorithms#WAN Optimization

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