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 A nondisruptive upgrade is possible only when there are no changes to the configuration settings or network connections during the upgrade process. Any such changes can lead to a disruption, which is particularly critical in a dual supervisor Cisco Nexus 7000 series switch where stability is paramount.

References := For an in-depth understanding, refer to the Cisco Data Center Core Technologies study materials, specifically the sections discussing software upgrades and maintenance for Cisco Nexus switches

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On a Cisco Nexus 7700 Series switch, secured MAC addresses can be removed by either manually deleting the address from the configuration or when the address ages out, which is determined by the age limit set for the interface. The other options do not apply to the deletion of secured MAC addresses.

In the context of Cisco Nexus switches, VRF (Virtual Routing and Forwarding) is used to create multiple virtual routing tables within a single switch. By using the default VRF for the scheduler job, the engineer ensures that the TFTP server, which is reachable in the global routing table, can be accessed without the need for additional VRF configuration. This simplifies the backup process and avoids potential issues with VRF-specific routing that could prevent access to the TFTP server.

References: For more detailed information, please refer to the official Cisco documentation for Nexus 3000 Series Switches or the Implementing and Operating Cisco Data Center Core Technologies (DCCOR) study materials.