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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. A network engineer is troubleshooting a connectivity issue and finds that MAC addresses are not being resolved correctly. Which OSI layer is responsible for MAC address resolution?

    Answer: Data Link layer

    The Data Link layer (Layer 2) handles MAC addresses and frame delivery on the local network segment.

  2. During data encapsulation, what term describes the data unit at the Transport layer?

    Answer: Segment

    At the Transport layer (Layer 4), the data unit is called a segment (for TCP) or datagram (for UDP).

  3. Which OSI layer is responsible for establishing, managing, and terminating sessions between applications?

    Answer: Session layer

    The Session layer (Layer 5) manages dialog control and session establishment, maintenance, and termination.

  4. A packet is received with a TTL value of 0. Which OSI layer processes TTL and causes the packet to be discarded?

    Answer: Network layer

    The Network layer (Layer 3) processes TTL; when it reaches 0, the router discards the packet and sends an ICMP Time Exceeded message.

  5. Which layer of the OSI model converts data into a format suitable for transmission, including encryption and compression?

    Answer: Presentation layer

    The Presentation layer (Layer 6) handles data translation, encryption, and compression to ensure data is in a usable format.

  6. A technician captures network traffic and notices that data is being transferred using port 443. Which OSI layer is associated with port numbers?

    Answer: Transport layer

    Port numbers are a Transport layer (Layer 4) concept used to identify specific processes or services on a host.

  7. In the OSI model, de-encapsulation occurs at the receiving host. In what order are headers removed?

    Answer: Physical → Data Link → Network → Transport → Session → Presentation → Application

    De-encapsulation proceeds from the bottom up — Physical, Data Link, Network, Transport, Session, Presentation, Application — stripping each layer's header as data moves up the stack.