You were asked to use porttest on some of your storage ports due to possible physical layer issues. Which two functions does this command provide? (Choose two.)

The correct answer is B. Isolates problems in a single replaceable element. D. Verifies the persistence of failures detected earlier. Brocade 143-420 Exam

FICON Management and Troubleshooting

Question

Options

ADetects congestion on this port.
BIsolates problems in a single replaceable element.
CMeasures the throughput of the port.
DVerifies the persistence of failures detected earlier.

How the community answered

(18 responses)

A
6% (1)
B
78% (14)
C
17% (3)

Explanation

Brocade 143-420 Exam

Topics

#porttest#physical layer diagnostics#port isolation#fault verification

Community Discussion

Nina C.Mar 30, 2026

The correct answers are B and D. The porttest command is specifically designed to help you nail down physical layer problems, so it works by isolating the issue to a single replaceable element, meaning you can point to one specific component like a port or SFP rather than guessing across the whole fabric. It also verifies whether a failure you saw before is still there or was a one-time thing, which matters a lot when you are trying to decide if something needs to be swapped out. A and C are tempting because congestion and throughput both sound like port-related concerns, but those are performance layer issues, and porttest is not a performance tool. Once I understood that porttest is strictly a physical layer diagnostic, the two right answers clicked right away.

Anjali D.Apr 1, 2026

Nina, that is a solid breakdown, though I would add that knowing porttest takes the port offline during the test is just as important as knowing what it diagnoses, because that affects when you can actually run it in a production environment.

Brenda K.Mar 18, 2026

Good quick-win question once you know what porttest actually does, B and D lock in fast. Here is what I want you to think about: porttest is not a performance tool, so why would two of the wrong answers tempt you with words like "congestion" and "throughput," and what does that tell you about how the exam writers like to bait people who confuse diagnostic commands with monitoring commands?

Anjali D.Mar 27, 2026

Our group landed on B and D pretty quickly, but C was the one that tripped a few people up at first because measuring throughput sounds like it fits a port diagnostic context. The thing is, porttest is specifically a physical layer tool, so it is designed to pinpoint whether a failure lives within one replaceable unit, not to benchmark performance. D is the one I think the wording undersells, because what it is really doing is confirming that a fault is real and repeatable rather than a one-time transient event, which matters a lot before you start swapping hardware. A is clearly out since congestion is a traffic management concern, not a physical layer symptom at all. Anyone in the group run porttest in a lab environment and want to share what the output actually looked like for D?

Full 143-420 Practice