Exam 220-1101 topic 1 question 21 discussion

Looking in the book CompTIA A+ page 181 in the cram quiz it is explained: Question: Which type of cable would you use if you were concerned about EMI? " STP (shielded twisted pair) is the only cable listed here that can reduce electro magnetic interference. However, fiber optic cable is another good solution, though it is more expensive and more difficult to install." So, it should be B according to the book.

Def shielded cat6

Cat 6 is Shielded and is not as Expensive as Fiber

C. Plenum Cat 5e Plenum-rated Cat 5e cables are designed for use in spaces with air circulation, such as the plenum spaces in buildings. They have a protective coating that helps reduce the impact of EMI and provide reliable network connectivity. Cat 5e cables are suitable for many common networking scenarios and offer a good balance between performance and cost. While shielded Cat 6 cables (Option B) can also provide protection against EMI, they are generally more expensive than Cat 5e cables. Coaxial cables (Option A) are not as common for typical office network installations, and multimode fiber (Option D) is usually more expensive than copper cables. Therefore, for a cost-effective solution that maintains good performance and addresses EMI concerns, Plenum Cat 5e would be a suitable choice.

Chat GPT Answer: B. Shielded Cat 6 Shielded Cat 6 (Category 6) cable is designed to provide protection against electromagnetic interference (EMI). It is a cost-effective solution that offers good performance for typical office network environments. The shielding helps reduce the impact of external interference on the network signal, making it a suitable choice when dealing with sporadic network connectivity issues caused by EMI. While other options like Multimode fiber or Plenum Cat 5e may also provide EMI resistance, they might be more expensive or not as cost-effective for a standard office setting.

D. Multimode fiber but I have to say is not good price... in order do not sacrifice performance once I don't know how much speed they have I will advise to fiber always... single mode for example is not super expensive ..

The "MOST cost-effective" cable medium that can help mitigate EMI without sacrificing system performance would be Shielded Cat 6 cable. Fiber optic cables, including multimode fiber, are excellent at resisting EMI. However, they are generally more expensive to install and terminate compared to copper cables. Fiber is often used for long-distance connections or where extremely high bandwidth is required.

The correct answer is D because it's the only one that can solve the problem "without sacrificing system performance". EMI doesn't affect fiber. B is cost effective but cannot eliminate EMI completely.

Yeah , changing whole cabling to fiber will be more effective ..

It says most cost effective, so it's Shielded Twisted Pair over Fiber, which is much more expensive.

The answer is "Shielded Cat6" in this instance but yes, Fiber could also work, it's just to dang flippen expensive. Fiber for those that don't know yet, is actually completely immune to EMI since it does not work with copper, it works with glass and light that reflects. I see "Coaxile" is also listed as an answer. That believe it or not is actually also like using "STP". It also has a shield and is somewhat immune to EMI like STP cable BUT....Coaxile cable is very old technology and you would be sacrificing "performance/speed" and the question specifically states you don't want to do that so yes, the answer is STP. I've been training the A+ courses for almost 2 decades now and wrote the exams more times than I can remember so I can really tell you when it's the one or the other. Feel free to check out my Youtube channel "BurningIceTech" where I give free IT training including for the A+ course

Fiber is More Expensive the CAT6e

Fiber is more expensive ie not cost effective . Therefore shieded cat6 is correct

Fiber would give you 0 issues but it is the most expensive. So Shielded Cat 6.

The term “cost effective” means producing good results without costing a lot of money12. In other words, something that is cost effective provides good value for the money spent. Cost effectiveness can be measured by comparing the benefits and costs of different alternatives and choosing the one that has the highest benefit-cost ratio3.

The Key Word is "cost-effective" best result for the money spent. Therefor the answer is D

This question is quite vague. Cost effective immediately makes think cheaper, but we don't know what kind of ethernet is actually there and how strong are the EMI. STP could be a good solution if now there's UTP and EMI are not so high, but in absence of specifications I would feel like D is my best option