Network-as-a-service Market By Type (WAN-as-a-service, LAN-as-a-service), By Application (WAN Optimization, Bandwidth on Demand, Cloud and SaaS Connectivity, Network Access Control, Virtual Private Network, Secure Web Gateway, UCaaS/Video Conferencing, Others), By Enterprise Size (Large Enterprise, SMEs), By Industry Vertical (IT and Telecom, BFSI, Healthcare, Manufacturing, Retail and E commerce, Government and Public Sector, Others): Global Opportunity Analysis and Industry Forecast, 2021-2031