Exam 350-401 topic 1 question 230 discussion

C is correct

Answer is correct link provided expired, here is the valid. NetFlow is a key element of the original version of the Cisco Cyber Threat Defense solution, and continues to play a vital role in this second-generation update. NetFlow is a Cisco application that measures IP network traffic attributes of a traffic flow. A flow is identified as a unidirectional stream of packets between a given source and destination as it traverses the Cisco device. NetFlow was initially created to measure network traffic characteristics such as bandwidth, application performance, and utilization. Reference: https://www.cisco.com/c/dam/en/us/td/docs/security/network_security/ctd/ctd2-0/design_guides/ctd_2-0_cvd_guide_jul15.pdf

NetFlow is an embedded instrumentation to characterize network operation. Visibility into the network is an indispensable tool for IT professionals. In response to new requirements and pressures, network operators are finding it critical to understand how the network is behaving including: Application and network usage Network productivity and utilization of network resources The impact of changes to the network Network anomaly and security vulnerabilities Long term compliance issues