In SNMP, what is an OID?

• A. An OID uniquely identifies a managed object
• B. An OID is the same as a MIB module
• C. An OID indicates the IP address of a device
• D. An OID is used to describe encryption keys

Answer: (A)

In SNMP, an OID uniquely identifies a managed object within the MIB hierarchy. The MIB is a tree of data items that describes what you can monitor or control on a device, and every object has a distinctive OID—the address in that tree for the exact variable you want to read or set. This precise reference lets SNMP operations target a specific piece of data, such as system uptime or interface status. It’s not the MIB module itself, not an IP address, and not related to encryption keys. OIDs are usually shown as dotted-decimal strings like 1.3.6.1.2.1.1.3.0.