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In the OSI model, what is the name of the Protocol Data Unit (PDU) at the Data Link layer?

easy📝 Conceptual Q1 of 15
Computer Networks - OSI and TCP/IP Models
In the OSI model, what is the name of the Protocol Data Unit (PDU) at the Data Link layer?
AFrame
BPacket
CSegment
DBit
Step-by-Step Solution
Solution:

  1. Step 1: Recall OSI layer PDUs

    The Data Link layer uses the term 'Frame' for its PDU.

  2. Step 2: Match PDU to Data Link layer

    Frames encapsulate packets from the Network layer and add headers/trailers for physical transmission.

  3. Final Answer:

    Frame -> Option A

  4. Quick Check:

    Data Link layer PDU = Frame [OK]
Quick Trick: Data Link layer always uses Frames as PDUs [OK]
Common Mistakes:
MISTAKES
  • Confusing Packet with Frame
  • Mixing Transport layer terms
  • Thinking Bit is a PDU

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