Exam N10-007 All Questions

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Exam N10-007 topic 1 question 2 discussion

Actual exam question from CompTIA's N10-007

Question #: 2
Topic #: 1

A technician has racked a new access switch and has run multimode fiber to a new location. After installing an extended-range 10Gb SFP in the core switch, the technician installed a 10Gb SFP in the access switch and connected the port to the new extension with a fiber jumper. However, the link does not display, and the technician cannot see light emitting from the core switch. Which of the following solutions is MOST likely to resolve the problem?

A. Swap the fiber pairs in one of the SFPs
B. Replace the jumpers with single-mode fiber
C. Set the correct MTU on the new interface
D. Install an optic that matches the fiber type

Show Suggested Answer

Suggested Answer: B 🗳️

by Cneo6 at Nov. 26, 2019, 9:37 p.m.

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Skoggkatt

Highly Voted 3 years, 11 months ago

What does comTIA you want to answer... that is the real question....

upvoted 9 times

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Gdhhd

Highly Voted 5 years, 4 months ago

Swap the fiber at either end to see if a link is established would the quickest potential fix..why the hell would i swap the jumper for a single mode whem the trunk fiber is multimode

upvoted 7 times

DohJayVeh

4 years ago

the SFP Extender doesnt work with Multimode, only singlemode fibre. When it says its an SFP extended that lets us know that it should be using single mode fibre.

upvoted 14 times

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PeoplesChamp

3 years, 1 month ago

The answer you gave is a good troubleshooting step to take next, but the question asks "what is the MOST LIKELY solution?" Which is B because the SFP EXTENDER only works with single mode fiber not multimode.

upvoted 1 times

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Some_Random_Nerd

Most Recent 2 years, 11 months ago

This question is another example of how much CompTIA hates you and wants you to fail. What do they want you to know here? That swapping the fiber pairs at either end will MOST likely fix the issue in almost every SFP related question? Or are they ACTUALLY being more specific than that? As is the way with so many CompTIA questions, this one forces us to make too many assumptions. If we assume that the use of multimode fiber for the trunk was by design, and the sfp in the Access switch is NOT extended range, then the sfp in the core switch would need to be replaced with a standard range to match. It's two against one. Fix the single point of failure. But which of the answers provided looks the most like "replace the core switch's SFP with a standard range SFP"? Does "Install an optic that matches the fiber type" work? So we are forced to assume that they used to word optic to be short for "10Gb SFP optical transceiver". And this is why CompTIA sucks.

upvoted 1 times

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AnotherFatITGuy

3 years, 5 months ago

Answer is D. The tech has a core switch. The tech has a new access switch. Technician ran multimode Fiber to new location. (From rack with core switch to rack with access switch). The technician installs an 10Gb ("extended-range" so Singlemode Fiber) SFP into core switch. The technician installs a 10Gb SFP ("notice no mention of extended-range" so Multimode Fiber) We have a access switch with a MMF SFP optic, up to 300m of MMF cable between access switch and core switch, and a core switch a newly installed, non-matching SMF SFP optic. Change the optic in the core switch to match the MMF infrastructure. Would want to use MMF over SMF when possible to reduce costs. https://www.multicominc.com/training/technical-resources/single-mode-sfp-vs-multi-mode-sfp/

upvoted 3 times

Some_Random_Nerd

2 years, 11 months ago

I like your response better than mine. Very succinct, zero rant. I should try to apply this strategy in my future commentary. But BOY do I like to rant about CompTIA...

upvoted 1 times

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jojomax

3 years, 10 months ago

Answer is A “the reason fiber cables need to be crossed is rather simple: when connecting fiber from one device to another, the fiber strands need to be cross so that TX goes to RX on each end.”

upvoted 3 times

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Samha

3 years, 11 months ago

Same Question On #764 and answer is A on the other one. A network technician is installing a new fiber-optic connection between two buildings on a campus network. When the network technician connects the fiber at the second location, the interface link light does not light up. Which of the following should the technician do NEXT? A. Reverse the fiber pair. B. Check the duplex on each interface. C. Install a fiber distribution panel. D. Configure a media converter for each switch.

upvoted 2 times

Stonetales987

3 years, 5 months ago

This is a similar question, but in #764 there is no mention of extended-range SFP or mode of fiber (MM/SM). For this question, if the interface link light does not illuminate, the correct action would be to A. Reverse the fiber pair.

upvoted 4 times

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jason24

4 years, 11 months ago

"extended-range 10Gb SFP" is the key here. And their use of the word "jumpers" means all the mm fiber is getting changed.

upvoted 4 times

TedTheAtheist

4 years, 5 months ago

So you're saying it's "A"?

upvoted 3 times

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PerkDizzzle

5 years, 4 months ago

From multiple sites, while it seems possible that A is the answer, B seems to be correct based upon other third party sites.

upvoted 3 times

Bubu3k

4 years, 9 months ago

that doesn't help all sites seem to just copy each other

upvoted 10 times

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Cneo6

5 years, 5 months ago

Is it safe to say that we are making the educated assumption that the new location that is at an unspecified distance from the core switch is farther than the max range of the MMFiber specs due to the use of the extended range SPFs?

upvoted 5 times

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