CISSP PRACTICE QUESTIONS – 20200319

Effective CISSP Questions

Your company is constructing a new building with a structured cable system topology per the standard EIA/TIA 568. As a network engineer, you are designing an 802.3 network. The vertical backbone between floors is connected with optical cables. The horizontal cabling is implemented with Category 5e UTP. Which of the following is the most concern?
A. Near-end Crosstalk (NEXT) between floors
B. Attenuation after signal transitioning by active hubs
C. Contention on media access
D. Loss of token and frames on high traffic transmission


Kindly be reminded that the suggested answer is for your reference only. It doesn’t matter whether you have the right or wrong answer. What really matters is your reasoning process and justifications.

My suggested answer is C. Contention on media access.

Ethernet (802.3) relies on CSMA/CD, which is a contention-based media access strategy.

  • The vertical backbone between floors is connected with optical cables, which are insusceptible to Near-end Crosstalk (NEXT).
  • Attenuation after signal transitioning by active hubs won’t happen because active hubs act like repeaters maintaining the strength of the signal.
  • Only token ring (802.5) and token bus (802.4) use token to control media access. Ethernet (802.3) is contention-based and won’t lead to loss of token.

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