Keep the supported Infoblox hardware platform under a 1-year maintenance term with ISP L3+ coverage. PT-MAIN-4000-10GE-HW-DC-S21 applies specifically to the PT-4000-10GE-HW-D platform, pairing the service term and maintenance classification with that covered hardware designation. It is a service entitlement rather than an appliance, module, or replacement hardware item. The 1-year duration makes this SKU appropriate when maintenance coverage must align to an annual service period for an existing PT-4000-10GE-HW-D deployment. ISP L3+ identifies the maintenance level associated with this offering. Select this service where both the covered platform and the stated L3+ service classification match the installed environment. This offering is differentiated by its specific hardware coverage target, annual term, and ISP L3+ maintenance designation. It does not represent general maintenance for an unspecified Infoblox device. Match the service to the exact PT-4000-10GE-HW-D hardware platform before applying coverage, especially where multiple Infoblox appliances or service levels are present in the same environment.