Module 4: Implement the DiffServ QoS Model. Lesson 4.8: Understanding WAN Link Efficiency Mechanisms. Objectives. Describe how link efficiency mechanisms can be used to optimize bandwidth. Describe Layer 2 payload compression.
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Lesson 4.8: Understanding WAN Link Efficiency Mechanisms
Layer 2 payload compression
Link Fragmentation and Interleaving (LFI)
Remove redundancy as much as possible.
There is a theoretical limit, known as Shannon's limit.
MPEG compression for video
Huffmann compression for text and software
LZ compression, used in Stacker compression
Excessive delay due to slow link and MTU-sized (large) packets
Jitter (variable delay) due to variable link utilizationLarge Packets “Freeze Out” Voice on Slow WAN Links