Refer to the exhibit. Shortly after SiteA was connected to SiteB over a new single-mode fiber path, users at SiteA report intermittent connectivity issues with applications hosted at SiteB. What is the cause of the intermittent connectivity issue?
A.
Interface errors are incrementing.
B.
High usage is causing high latency.
C.
An incorrect SFP media type was used at SiteA.
D.
The sites were connected with the wrong cable type.
reliability 255/255: When the input and output errors increase, they affect the reliability counter. This indicates how likely it is that a packet can be delivered or received succesfully. Reliability is calculated like this: reliability = number of packets / number of total frames. The value of 255 is the highest value meaning that the interface is very reliable at the moment. The calculation above is done every 5 minutes.
So answer A is correct.
Yes but, this definition is for "Reliability" which could be composed of unknown factors, none of which are specifically stating, "Interface Errors". Could be. What is the CAUSE? The only indication is throughput is blowing up the link. High volume of frames.
Why aren't people reading the question? It asks what is causing the issue not can you confirm the issue. Yes the reliability is down BUT WHY IS IT DOWN? That is the question not if there is an issue with reliability. We know there is a problem with reliability the question stated it and is confirmed by the reliability counter.
This question is incredibly stupid. If we refer to the exhibit as per the instructions, A is the only logical answer. If we use our common sense and again, refer to the question, A is not a CAUSE.
Although I disagree with answer A and would of chosen answer D, I have seen some official answers and when the question asks you to refer to the exhibit, *always* use information from the exhibit rather than extrapolating an answer. This exam often test your ability to interpret the given data, not your broader technical judgment...
According to the output of interface0/1/0 , option A shows the problem that site A is experiencing (reliability 166/255). But the question is asking for the "CAUSE of the problem". As we know, cable related issues can cause intermittent connectivity.
Although, the output also shows that the right cable was used, but, it's worth checking the cable which is likely the CAUSE instead of focusing on the output of the cause.
The most likely cause is an incorrect fiber cable type. Although both sides report using SFP-LR (which is meant for single-mode fiber), the issue began after installing a new fiber path. Site A shows degraded reliability (166/255) while Site B is fine (255/255), indicating a one-sided physical issue. This is consistent with using multi-mode fiber with single-mode optics, which can result in intermittent connectivity without fully dropping the link. Therefore, the wrong cable type is the root cause — not interface errors (which are symptoms).
What is the cause...?
A just confirms an issue, not the cause.
C SFPs are the same LR which you use on SM Fiber
D wrong cable will connect sites but cause issues.
Will go for D. The question is unusually long as it insists on the single mode finer path. Using a multi mode cable would result in some packet loss and probably this degraded reliability in the stats.
Value of 166/255: This value translates to approximately 65% reliability. This means that the interface is experiencing some issues that affect its ability to deliver or receive packets reliably
D is AI's response. Using the appropriate SFP modules as is the case here does not explicitly imply that the right fibre cable (single-mode or multi-mode) has been used for this point to point connection.
A is not correct because it shows the effect of the problem and NOT the connectivity issue cause (that is what the question requires)
B is not correct because, according to the TxLoad and RxLoad values (1/255) there is a very low usage.
C is not correct because the used SFP are equals both side.
The correct answer is D. Probably the sites distance is 5km but are connected with an OS1 single-modal type that support 10G on maximum distance of 2km.
Looks like a case of bad English to me, apparently operations moved out of the US.... A cause and effect are two different things, incrementing errors is an "effect" caused by some underlying issue, it can't be a "cause" by itself, incrementing errors is an equivalent to connectivity issues, it's nonsensical to define it as a cause for technician reporting it
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