Global WAN Optimization Market Size study with COVID-19 Impact, by Component (Solution and Services), by Deployment Mode (On-Premises and Cloud), by End-User (Large Enterprises and Small and Medium-Sized Enterprises), by Solution (Traditional Wide Area Network and Software-Defined Wide Area Network), by Services (Professional Services and Managed Services), by Vertical (Banking, Financial Services, and Insurance, Manufacturing, Healthcare, Telecom And IT, Media and Entertainment, Retail, Energy, Education and Others) and Regional Forecasts 2020-2027