2. (20 points) Software Defined Networks Across networking academic research and industry, Software defined networking (SDN) and network function virtualization (NFV) have been transformational. Long-time incumbents such as Intel, Broadcom, Cisco, and IBM have SDN products. Several startups such as Nicira, Contrail have been acquired. SDN solutions have been extensively deployed across enterprises and Google's Wide Area Networks. Finally, SDN is anticipated to transform global-scale carrier networks (such as operated by AT&T, NTT, France Telecom, Deutsche Telekom, and others). To answer this question, you will need to perform some web-based research of your own! a) Explain how SDN requirements for carrier networks differ from datacenter networks. b) Give one example of a commercial SDN switch that can be deployed in data centers. What functions does it support to manage data center workloads