Comprehensive and Detailed in Depth Explanation:WAN upgrades are driven by evolving enterprise needs, as outlined in the HCSA-Sales-IP Network V6.0:
Deteriorated connection performance (A):Aging WAN infrastructure struggles with latency and packet loss, necessitating upgrades.
Complex O&M (B):Traditional WANs require manual management, driving the shift to SD-WAN for simplification.
Insufficient bandwidth (C):Cloud and application growth demand higher capacity.
[Reference:HCSA-Sales-IP Network V6.0, Chapter 6: WAN Evolution and Challenges., ]
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