There are two standard naming formats used to identify target or initiator iSCSI nodes: IQN (iSCSI Qualified Name) and EUI (Extended Unique Identifier). IQN is a more flexible naming method and is commonly used for iSCSI targets and initiators, while EUI is derived from the IEEE EUI-64 standard and is another method for iSCSI node naming. Other formats, such as WWPN and WWN, are typically used within Fibre Channel networks, not iSCSI.