Q: 11
[InfiniBand Troubleshooting]
You are troubleshooting an InfiniBand network issue and need to check the status of the InfiniBand
interfaces. Which command should you use to display the state, physical state, and link layer of
InfiniBand interfaces?
Options
Discussion
Option D Encountered exactly similar question in my exam, and D was the right pick for InfiniBand status details.
D . Had something like this in a mock and it wanted ibstat for all those status checks.
D . Only ibstat -d mlx5_X actually covers state, physical state, and link layer together. Other options leave something out.
D but B looks tempting since you can grep for interface status that way too. Not completely sure since I've only used ibstat for quick summary, would be interested if anyone found B better in practice.
Feels like it's D. ibstat gives you state, physical state, and link layer in one go, exactly what the question is after.
C isn't right here, it's D. Official guide and lab walkthroughs both use ibstat for checking those exact interface details.
Does the question specify if "mlx5_X" is just an example, or are we supposed to check all InfiniBand devices? If it wants "the best" option for checking multiple interfaces at once, maybe B could be tempting, but D directly shows state and link info per interface.
D , had almost this exact question in a mock test. ibstat -d mlx5_X is the one that shows all three details for local InfiniBand interfaces. Others don’t hit all the required info, but correct me if I’m missing something.
Why not B here? Pretty sure only D shows link layer directly.
D tbh, ibstat -d mlx5_X is the one that directly shows state, physical state, and link layer. Other commands miss some of that info. Seen this format before in labs, so I’m pretty sure it’s D but open to correction.
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