Selected Answer: D I think it's D. The question doesn't specify the exact switch type. It *is* disruptive for MDS 91/92/93xx series switches, which do not have standby supervisors, but for director switches, the upgrade is non-disruptive if the standby supervisor is upgraded first. The answers seem to suggest that we have switches with standby supervisor units. https://www.cisco.com/c/en/us/td/docs/switches/datacenter/mds9000/sw/8_x/release_notes/epld/epld_rn_8x.html#pgfId-314100

Selected Answer: A An EPLD update of the supervisor module of Fabric Switches (Cisco MDS 9100, Cisco MDS 9200, and Cisco MDS 9300 Series switches) is disruptive since there is no redundant supervisor to take over while the update is in progress. All traffic through the system is stopped while updating and the switch is power cycled after the upgrade has completed. The update may take up to 30 minutes to complete.

Selected Answer: A I will choose A

DDDDDDDDDDDDDDDD

This is a very tricky question. There is no information if the MDS switches are 9100/9200/9300 or 9500/9700. If MDS9100/9200/9300 then the answer is A (because there is no redundant supervisor module),. But if it is about MDS9500/9700 then the correct answer is D(because they have redundant supervisor)

option D said, Service disruption, not traffic disruption

Selected Answer: A I would answer A. The question mentions 9000 Séries “Switches”, not “Directors”. Also, even with a redundant sup, you have to upgrade the standby from the active, then fail over and upgrade the other sup. The supervisor does not “take over” by itself.

For me answer is D. https://www.cisco.com/c/en/us/td/docs/switches/datacenter/mds9000/sw/6_2/release/notes/epld/epld_rn.html#62980

Correct

Selected Answer: A Official Cert Guide Book p503 " NOTE An EPLD update of the supervisor module of fabric switches (Cisco MDS 9100, Cisco MDS 9200, and Cisco MDS 9300 Series switches) is disruptive because there is no redundant supervisor to take over while the update is in progress. All traffic through the system is stopped for the duration of the update, and the switch is rebooted after the upgrade has completed. The update may take up to 30 minutes to complete. "

Selected Answer: A All traffic is halted for the full duration of the EPLD update, and the switch is rebooted after the upgrade finishes. Explanation: An EPLD update on the supervisor module of Cisco MDS 9000 Series Switches is a disruptive process that impacts both control and data plane operations. Traffic Disruption: During the EPLD update, all traffic—both control plane (management and protocol operations) and data plane (data forwarding)—is stopped. Switch Reboot: Once the EPLD update is complete, the switch reboots to apply the changes properly.

Selected Answer: D The key phrase is "supervisor module" on a Cisco MDS Director-class switch, which has redundant supervisors. Cisco's documented EPLD upgrade procedure is: Upgrade the standby supervisor. The standby supervisor is power-cycled. Perform a supervisor switchover. Upgrade the former active (now standby) supervisor. This process is specifically meant to be nondisruptive. Cisco says that to upgrade supervisor EPLDs nondisruptively, you upgrade the standby supervisor, perform a switchover, and then upgrade the other supervisor.