A warehouse deploys barcode scanners joined by MAC authentication with no supplicant, no browser and no SNMP agent, and they only ever send DHCP requests containing vendor parameters. Profiling must classify them on the first connection, while active port scanning is blocked on that WLAN. Which probe supplies the attribute ISE should use to fingerprint the scanners?
Select an answer to reveal the explanation.
Short Explanation
These scanners give you almost nothing to work with, so the winning probe has to listen where they actually talk. Every device introduces itself at the address desk, and that DHCP probe catches the vendor hints on the very first connection.
Full Explanation
The DHCP probe is correct because the scanners include vendor-specific information in their DHCP requests: the vendor class and requested parameter list can provide a distinctive fingerprint as soon as ISE observes the initial connection. This is passive profiling and does not depend on a browser, an endpoint SNMP agent, or active port scans. The RADIUS probe can supply useful session context, such as the Calling-Station-ID and network access device attributes, but those describe the MAC-authentication session and its access infrastructure; they do not expose the DHCP vendor parameters needed to distinguish these scanners. The SNMP approach is also used in profiling, but querying the access switch's MAC table and port data mainly establishes where an endpoint is connected. It does not retrieve the scanner's DHCP fingerprint, and the scanner itself has no SNMP agent. DNS-based profiling can use observed names and query behavior, but it cannot help here because the scenario says the scanners only send DHCP requests. Exam caveat: ISE can combine evidence from multiple probes, so a probe that contributes useful context is not necessarily the one that supplies the decisive attribute. In practice, verify that DHCP snooping or packet capture shows the relevant vendor class and requested parameter list, and confirm that the DHCP probe is enabled and its data reaches ISE.