Exin CDCS Exam - Topic 3 Question 22 Discussion

Actual exam question for Exin's CDCS exam

Question #: 22
Topic #: 3

[All CDCS Questions]

What is the main advantage of using an End-of-Row (EoR) design?

AA single Top-of-Rack (ToR) switch is more expensive than an EoR switch

BYou need a separate rack to install all your EoR switches

CThere will be fewer switches to manage (corrected typing: original said ''more'')

DA ToR switch has only optical interfaces

Show Suggested Answer

Suggested Answer: C

EoR centralizes access/aggregation switches at the end of each row, reducing the number of access switches compared with ToR (one per rack), which simplifies management and often lowers Ops costs.

A, D are incorrect generalizations.

B is a characteristic (housing EoR switches in a dedicated cabinet) but not the key advantage.

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by Goldie at Nov 20, 2025, 01:40 PM

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Remedios

3 days ago

Yeah, C just makes sense for efficiency.

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Enola

8 days ago

I feel like C really simplifies the setup.

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Francoise

13 days ago

True, but managing fewer switches saves time overall.

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Beula

18 days ago

But what about A? ToR switches can be pricey.

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Diane

24 days ago

Agreed! Less complexity is a huge plus.

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Lonny

29 days ago

I think C is the best choice. Fewer switches means easier management.

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Dominic

1 month ago

Definitely a game changer for large data centers!

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Glenna

2 months ago

I thought ToR switches were more efficient though?

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Monroe

2 months ago

Wait, are EoR switches really cheaper overall?

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Johnna

2 months ago

Totally agree, less complexity is always better.

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Youlanda

2 months ago

Fewer switches to manage is a big plus!

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Raelene

2 months ago

Haha, who needs more switches to manage? I'll take the EoR design any day!

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Junita

3 months ago

C) Fewer switches to manage? Sign me up! I'd rather spend my time on more important tasks.

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Lavera

3 months ago

D) A ToR switch has only optical interfaces? Wow, I didn't know that. Sounds like a real limitation.

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Luisa

3 months ago

I thought EoR was beneficial because it centralizes management, but I might be mixing it up with other designs.

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Lawana

3 months ago

I feel like the cost comparison between ToR and EoR switches was mentioned in class, but I can't recall the details.

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Una

3 months ago

I remember practicing a question about switch management, and I think EoR designs help simplify that.

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Cecily

3 months ago

I think the main advantage is about managing fewer switches, but I'm not entirely sure if that's the only reason.

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Audrie

4 months ago

Ah, I see. The key is identifying the main advantage, not just any advantage. I think C is the strongest answer here, but I'll review my notes to make sure I'm not missing anything.

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Lettie

4 months ago

The question is asking about the main advantage, so I need to focus on which option provides the biggest benefit. I'm leaning towards C, but I'll double-check the other choices just to be sure.

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