The question explicitly asks for a file to be generated and to rollback from file, so A and B are the correct answers.

https://www.cisco.com/c/en/us/td/docs/switches/datacenter/nexus9000/sw/6-x/system_management/configuration/guide/b_Cisco_Nexus_9000_Series_NX-OS_System_Management_Configuration_Guide/sm_7rollback.html#task_742A244D6D954A37BE3DBA8E740D665E

A,B look correct.

shouldn't it be AD?

TULLY01# checkpoint ? <CR> WORD Checkpoint name (Max Size 80) description Checkpoint description for the given checkpoint file Create configuration rollback checkpoint to file TULLY01# checkpoint pepe ? <CR> description Checkpoint description for the given checkpoint TULLY01# checkpoint pepe description ? LINE Checkpoint description(can include spaces) (Max Size 80) TULLY01# checkpoint pepe description tito

A and B We need to give a file name for checkpoint hence we need "checkpoint file ..." Command. We need "atomic" flag and execute rollback from a file to the running configuration, hence we need "rollback running-config file ... atomic" command.

The Answer A & B Seems correct atomic—Implement a rollback only if no errors occur. best-effort—Implement a rollback and skip any errors. stop-at-first-failure—Implement a rollback that stops if an error occurs.

Configuration Example for Rollback This example shows how to create a checkpoint file and then implements a best-effort rollback to a user checkpoint name: checkpoint stable rollback running-config checkpoint stable best-effort

A and B

There are two key requirements in the question: 1. Configuration rollback from a file -> B 2. Rollback will be performed only in there are NO ERRORS -> atomic rollback method must be used = A

yes C and D!

The answer is totally incorrect. The correct answer is CD https://www.cisco.com/c/en/us/td/docs/switches/datacenter/nexus9000/sw/6-x/system_management/configuration/guide/b_Cisco_Nexus_9000_Series_NX-OS_System_Management_Configuration_Guide/sm_7rollback.html#task_742A244D6D954A37BE3DBA8E740D665E:~:text=all%20checkpoint%20files.-,Configuration%20Example%20for%20Rollback,-This%20example%20shows