Exam 350-601 topic 1 question 85 discussion

trick question, none of the answer is directly. Should be D, because "The show incompatibility-all system bootflash: system image filename command determines which features are incompatible with the destination upgrade release." C if incompatible features will be remove after upgrade/downgrade, is it ?

The answer is C Verifying Software Compatibility (ISSU and Chassis Reload) Introduced: Cisco NX-OS Release 4.0(1) Before downgrading software, verify if there are any incompatibilities to make sure features can be properly disabled before performing the downgrade. This will inform the administrator if there are any features that will be automatically removed from the configuration and allow the administrator to take action prior to the downgrade. This command should be run regardless if the ISSU or traditional downgrade method is performed. n7000# show incompatibility-all system bootflash:n7000-s1-dk9.4.2.4.bin Checking incompatible configuration(s) for vdc 'n7000': --------------------------------------------------------------- <CLI Output Omitted> 6) Service : otv , Capability : CAP_FEATURE_OTV Description : Overlay Transport Virtualization Capability requirement : STRICT Disable command : no feature otv 7) Service : bfd , Capability : CAP_FEATURE_BFD_V2 Description : Feature bfd is enabled. Capability requirement : STRICT Disable command : Disable bfd using"no feature bfd" <CLI Output Omitted>

C is the one

##### Answer is C##### n7000# show incompatibility-all system bootflash:n7000-s1-dk9.4.2.4.bin Checking incompatible configuration(s) for vdc 'n7000': --------------------------------------------------------------- <CLI Output Omitted> 6) Service : otv , Capability : CAP_FEATURE_OTV Description : Overlay Transport Virtualization Capability requirement : STRICT Disable command : no feature otv 7) Service : bfd , Capability : CAP_FEATURE_BFD_V2 Description : Feature bfd is enabled. Capability requirement : STRICT Disable command : Disable bfd using"no feature bfd" <CLI Output Omitted>

Before downgrading software, verify if there are any incompatibilities to make sure features can be properly disabled before performing the downgrade. This will inform the administrator if there are any features that will be automatically removed from the configuration and allow the administrator to take action prior to the downgrade. This command should be run regardless if the ISSU or traditional downgrade method is performed. n7000# show incompatibility-all system bootflash:n7000-s1-dk9.4.2.4.bin

I've changed my mind, I agree with C. You can see in here that the output shows which features will be disabled indeed. https://www.cisco.com/c/en/us/td/docs/switches/datacenter/sw/best_practices/cli_mgmt_guide/cli_mgmt_bp/nxos_upgrade.html

Best answer is C directly from the cert guide : ''Before downgrading software, verify if there are any incompatibilities to make sure features can be properly disabled before performing the downgrade. This will inform the administrator if there are any features that will be automatically removed from the configuration and allow the administrator to take action prior to the downgrade. This command should be run regardless if the ISSU or traditional downgrade method is performed.'''

Nothing to do with ISSU upgrade/downgrade... I dont like any of the answers, but the one that fits best in my opinion is D. From offical cert book: "Enter the show incompatibility command to verify that the target image is feature-wise compatible with the current image."