They can capture the actual data of the packet if it is not encrypted during data transmission.

Experienced users use the filtered mode when using the packet sniffer and capture the specific information. Collecting all the packet data will make the information overload.These tools are suitable for large enterprises. Paid or commercial tools provide features like intuitive analysis along with capturing data, deep packet inspection, graphs & charts and alerts on exception cases, etc.

For simple sniffing and quick diagnostics, free & open-source tools will be a good option. Some tools are simple and provide reliable & clean data collection and leave a small footprint. Note Some Cisco IOS software subsystem components set the size by default.Pro Tip: Various free & open sources as well as commercial tools for packet sniffing are available. Sets the number of messages that can be written to memory for a single instance of a trace. Turns on event tracing for the specified component provided that the component has been configured using the monitor event-trace command. The maximum length of the filename (path and filename) is 100 characters, and the path can point to flash memory on the networking device or to a TFTP or FTP server. Specifies the file where event trace messages are written from memory on the networking device. Turns off event tracing for the specified component. To get a list of components that support event tracing, use the monitor event-trace ? command. Name of the Cisco IOS software subsystem component that is the object of the event trace. Monitor event-trace component Syntax Description To monitor and control the event trace function for a specified Cisco IOS software subsystem component, use the monitor event-trace command in privileged EXEC mode. process cpu statistics limit entry-percentage.monitor session egress replication-mode.

Network analyzer ios