CISSP PRACTICE QUESTIONS – 20210404

Effective CISSP Questions

When it comes to the Data Link layer of the ISO OSI Reference Model, which of the following is least likely to be used for logic link control? (Wentz QOTD)
A. Sliding Window
B. Retransmission
C. Cyclic Redundancy Check (CRC)
D. Carrier-sense multiple access with collision detection (CSMA/CD)

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 D. Carrier-sense multiple access with collision detection (CSMA/CD).

Image Credit: TelecomWorld 101

The Data Link layer of ISO OSI Reference Model can be divided into two sub-layers from the perspective of IEEE: Logical Link Control (LLC) and Medium Access Control (MAC).

LLC deal with the following issues:

  • Flow Control: e.g., Sliding Window
  • Error Control
    • Error Detection: e.g., Cyclic Redundancy Check (CRC)
    • Error Correction: e.g., Retransmission

Medium Access Control (MAC)

The following are three well-known medium access mechanisms:

  • Token passing
  • CSMA/CD
  • CSMA/SA

Reference

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當涉及到ISO OSI參考模型的數據鏈路層(Data Link)時,以下哪一項最不可能用於邏輯鏈路(Logic Link)控制?(Wentz QOTD)
A. Sliding Window
B. Retransmission
C. Cyclic Redundancy Check (CRC)
D. Carrier-sense multiple access with collision detection (CSMA/CD)

1 thought on “CISSP PRACTICE QUESTIONS – 20210404

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