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NVIDIA NCP-AIN Exam - Topic 2 Question 5 Discussion

Actual exam question for NVIDIA's NCP-AIN exam
Question #: 5
Topic #: 2
[All NCP-AIN Questions]

[InfiniBand Troubleshooting]

You are troubleshooting InfiniBand connectivity issues in a cluster managed by the NVIDIA Network Operator. You need to verify the status of the InfiniBand interfaces. Which command should you use to check the state and link layer of InfiniBand interfaces on a node?

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Suggested Answer: B

To check the status and link layer of InfiniBand interfaces, the ibstat command is used. For example:

ibstat -d mlx5_0

This command provides detailed information about the InfiniBand device, including its state (e.g., Active), physical state (e.g., LinkUp), and link layer (e.g., InfiniBand).


by Hildred at Jun 15, 2025, 07:55 AM

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Dacia
4 months ago
I always use rdma show devices for quick checks.
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Genevive
4 months ago
Wait, can ifconfig even show InfiniBand status?
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Gracia
4 months ago
Totally agree, ibstat gives detailed info!
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Leanora
4 months ago
I think the right command is ibstat -d mlx5_X.
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Wendell
4 months ago
Surprised that ip link show dev ib0 isn't the go-to!
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Rosenda
5 months ago
I recall "rdma show devices" being mentioned in class, but I don't think it gives detailed link layer info like the others.
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Paulina
5 months ago
I’m a bit confused; I thought "ifconfig" was outdated, but it seems like it could still work for InfiniBand.
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Mira
5 months ago
I practiced a similar question where we had to check interface statuses, and I feel like "ip link show dev ib0" might be the right choice here.
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Lashon
5 months ago
I think I remember that "ibstat" command being used for checking InfiniBand interfaces, but I'm not entirely sure if it's the right one for link layer status.
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Devora
5 months ago
I'm a bit confused on this one. I was considering `ifconfig ib0`, but I'm not sure if that's the best option for verifying the InfiniBand interface status and link layer.
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Boris
6 months ago
Okay, let me think this through. I believe the `ibstat -d mlx5_X` command is the most appropriate here, as it's specifically designed for InfiniBand troubleshooting.
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Tammara
6 months ago
Ah, this is a tricky one. I'm leaning towards `ip link show dev ib0`, as that should give me a good overview of the InfiniBand interface status.
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Ty
6 months ago
Hmm, I'm a bit unsure about this one. I was thinking of using `rdma show devices`, but I'm not entirely confident that's the right command for this scenario.
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Kenia
6 months ago
I think the best approach here is to use the `ibstat -d mlx5_X` command, as it specifically checks the status and link layer of the InfiniBand interfaces.
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Lera
8 months ago
I'm going with B) ibstat -d mlx5_X. It's the InfiniBand-specific command, so it's got to be the right one. Unless it's secretly a trap question and the answer is actually 42...
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Lanie
7 months ago
User3: Good call. Let's see if we can get the status we need with ibstat -d mlx5_X.
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Kimberlie
7 months ago
User2: Yeah, that sounds right. Let's try that command first.
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Leota
8 months ago
User1: I think B) ibstat -d mlx5_X is the way to go. It's specific to InfiniBand.
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Cristy
9 months ago
A) rdma show devices? Really? That's like using a sledgehammer to crack a nut. Go for the more targeted option, B).
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Claribel
9 months ago
C) ifconfig ib0 is the way to go. Old school, but it'll get the job done!
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Talia
8 months ago
B) ibstat -d mlx5_X
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Gladys
8 months ago
A) rdma show devices
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Cecil
9 months ago
I'm not sure, but I think D) ip link show dev ib0 could also be used to verify the state of the interfaces.
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Leslee
9 months ago
I agree with Jeniffer, ibstat command is used to check the status of InfiniBand interfaces.
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Jeniffer
9 months ago
I think the answer is B) ibstat -d mlx5_X.
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Marshall
10 months ago
D) ip link show dev ib0 looks good to me. It's a classic Linux command for checking network interface details.
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Carman
10 months ago
Hmm, I think B) ibstat -d mlx5_X is the right choice here. That should give me the InfiniBand interface status, including the link layer details.
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Elke
9 months ago
Agreed, that command will provide the necessary details for troubleshooting.
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Bethanie
9 months ago
I think B) ibstat -d mlx5_X is the right choice here.
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