CISSP PRACTICE QUESTIONS – 20211128

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Effective CISSP Questions

Which of the following sends signals simultaneously over a range of different frequencies as electromagnetic waves? (Wentz QOTD)
A. Symmetrical Digital Subscriber Line (SDSL)
B. Integrated Services Digital Network (ISDN)
C. Fibre Channel over Ethernet
D. 1000BASE-T

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 A. Symmetrical Digital Subscriber Line (SDSL).

Wentz’s book, The Effective CISSP: Security and Risk Management, helps CISSP and CISM aspirants build a solid conceptual security model. It is a tutorial for information security and a supplement to the official study guides for the CISSP and CISM exams and an informative reference for security professionals.

Broadband transmission
Broadband transmission (Source: Computer Networking Notes)

Broadband

This question, in fact, paraphrases the concept of broadband transmission.

“Broadband Transmission is a signaling technology that sends signals simultaneously over a range of different frequencies as electromagnetic waves.” (Network Encyclopedia)

“In telecommunications, broadband is wide bandwidth data transmission which transports multiple signals at a wide range of frequencies and Internet traffic types, that enables messages to be sent simultaneously, used in fast internet connections. The medium can be coaxial cable, optical fiber, wireless Internet (radio), twisted pair or satellite.” (Wikipedia)

Broadband: Multiple Analog Signals

Broadband technology uses analog signals and can transmit multiple signal waves simultaneously, while baseband uses digital signals and transmits one signal data stream at a time.

  • 1000BASE-T (also known as IEEE 802.3ab) is a standard for Gigabit Ethernet over copper wiring. In computer networking, Gigabit Ethernet (GbE or 1 GigE) is the term applied to transmitting Ethernet frames at a rate of a gigabit per second. (Wikipedia) The term BASE in 1000BASE-T denotes baseband transmission.
  • Fibre Channel over Ethernet (FCoE) is a computer network technology that encapsulates Fibre Channel frames over Ethernet networks. This allows Fibre Channel to use 10 Gigabit Ethernet networks (or higher speeds) while preserving the Fibre Channel protocol. (Wikipedia) The 10 Gigabit Ethernet also relies on baseband transmission.
  • Integrated Services Digital Network (ISDN) is a set of communication standards for simultaneous digital transmission of voice, video, data, and other network services over the digitalised circuits of the public switched telephone network. (Wikipedia) Digital signals are suitable for baseband transimission.

Reference

以下哪項以電磁波的形式同時發送一系列不同頻率的信號？(Wentz QOTD)
A. Symmetrical Digital Subscriber Line (SDSL)
B. Integrated Services Digital Network (ISDN)
C. Fibre Channel over Ethernet
D. 1000BASE-T



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