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220-1101 · Question #656
220-1101 Question #656: Real Exam Question with Answer & Explanation
The correct answer is C: Cat 7. Cat 7 cable offers superior performance with the least Electromagnetic Interference (EMI) due to its higher shielding and tighter twists compared to previous Ethernet categories.
Networking
Question
Which of the following cables provides the best performance with the least EMI?
Options
- ACat 5
- BCat 6
- CCat 7
- DCoaxial
Explanation
Cat 7 cable offers superior performance with the least Electromagnetic Interference (EMI) due to its higher shielding and tighter twists compared to previous Ethernet categories.
Common mistakes.
- A. Cat 5 cables are older, unshielded or minimally shielded, and provide lower bandwidth with more susceptibility to EMI compared to newer categories.
- B. Cat 6 cables offer better performance than Cat 5e but generally have less shielding than Cat 7, making them more susceptible to EMI in comparison.
- D. Coaxial cable is a different type of network cable primarily used for older networking (e.g., RG-58 for 10BASE2) or cable television, and while shielded, it is not typically compared in the same performance category as modern twisted-pair Ethernet for high-speed data networking regarding EMI characteristics.
Concept tested. Ethernet cable categories, performance, and EMI reduction
Topics
#Networking cables#Ethernet standards#Cabling performance#EMI shielding
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