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Network+ OSI Model and Data Encapsulation Flashcards

7 cards from real COMPTIA practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

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  1. Which OSI layer is responsible for translating between different character encoding formats, such as ASCII and EBCDIC?

    Answer: Presentation layer

    The Presentation layer handles data translation between different encoding formats, ensuring compatibility between dissimilar systems.

  2. A technician is analyzing a frame and identifies a preamble and start frame delimiter. At which OSI layer do these fields belong?

    Answer: Data Link layer

    The preamble and start frame delimiter are part of the Ethernet frame structure, which belongs to the Data Link layer (Layer 2).

  3. A network monitoring tool reports a collision on a shared Ethernet segment. Which layer of the OSI model is involved in detecting and managing collisions?

    Answer: Data Link layer

    CSMA/CD, the collision detection mechanism for Ethernet, is a Data Link layer function (Layer 2).

  4. Which of the following protocols operates at both the Transport and Network layers in the TCP/IP model's mapping to OSI?

    Answer: ICMP

    ICMP is encapsulated within IP packets (Network layer) but provides transport-like messaging for error reporting and diagnostics, often mapped across Layers 3 and 4.

  5. What is the correct term for the Data Link layer PDU when it is specifically being transmitted over the physical medium?

    Answer: Frame

    The Data Link layer PDU is called a frame, which contains the payload, MAC addresses, and FCS for error detection.

  6. A network administrator configures QoS to prioritize VoIP traffic. Which OSI layer is primarily involved in this traffic prioritization?

    Answer: Network layer

    QoS (Quality of Service) prioritization using DSCP markings occurs at the Network layer (Layer 3), though Layer 2 CoS markings also apply.

  7. Which OSI layer provides end-to-end error detection and correction to ensure reliable data transfer between hosts on different networks?

    Answer: Transport layer

    The Transport layer (Layer 4) provides end-to-end error detection and correction through mechanisms like TCP's acknowledgment and retransmission.