Which three statements about Cisco Flexible NetFlow are true? (Choose three.)
Cisco Flexible NetFlow is a feature that allows the collection, aggregation, and analysis of network traffic flows in a highly customizable manner. Here are the three true statements about Cisco Flexible NetFlow:
B. It supports IPv4 and IPv6 packet fields: Flexible NetFlow supports both IPv4 and IPv6 protocols. It allows users to define and customize the specific fields that they want to collect, including Layer 2, Layer 3, and Layer 4 fields, as well as application-specific fields.
C. It tracks all fields of an IPv4 header as well as sections of the data payload: Flexible NetFlow can track all fields of an IPv4 header, including source and destination IP addresses, ports, protocol, Type of Service (ToS), and more. Additionally, it can track sections of the data payload, such as URLs, HTTP headers, and other application-specific data.
E. It can be a useful tool in monitoring the network for attacks: Flexible NetFlow can be used to monitor network traffic for signs of malicious activity, including DDoS attacks, worm outbreaks, and other types of network-based attacks. By analyzing traffic patterns and flow data, network administrators can quickly identify and respond to potential security threats.
A. The packet information used to create flows is not configurable by the user: This statement is false. With Cisco Flexible NetFlow, users can configure the specific packet fields that they want to collect and analyze. This allows for a high degree of customization and flexibility in how network traffic is monitored and analyzed.
D. It uses two types of flow cache, normal and permanent: This statement is also false. Cisco Flexible NetFlow supports several different types of flow caches, including the standard flow cache, which stores information about active flows, and the permanent cache, which stores information about long-lived flows. It also supports other types of caches, including the immediate cache and the normal cache.
In summary, Cisco Flexible NetFlow is a highly flexible and customizable network monitoring tool that supports both IPv4 and IPv6 protocols. It can track all fields of an IPv4 header, as well as sections of the data payload, and it can be used to monitor network traffic for signs of malicious activity. The packet information used to create flows is configurable by the user, and Cisco Flexible NetFlow supports multiple types of flow caches.