Certified Ethical Hacker (CEH) Practice Question

The MIB-2 object sysDescr, identified by the OID 1.3.6.1.2.1.1.1.0, returns a textual description of the network device that typically includes the vendor name, hardware platform, and full operating system version. This makes it one of the first OIDs attackers query when fingerprinting a target via SNMP. The ipForwarding OID (1.3.6.1.2.1.4.1) only indicates whether IP forwarding is enabled, ifDescr (1.3.6.1.2.1.2.2.1.2) lists interface descriptions, and hrSWRunName (1.3.6.1.2.1.25.4.2.1.2) enumerates running processes-none of which reliably provide the OS build information needed for version identification.