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A network engineer wants to analyze the data unit just before it is transmitted over the physical medium. Which PDU should they examine?

hard📝 Application Q8 of 15
Computer Networks - OSI and TCP/IP Models
A network engineer wants to analyze the data unit just before it is transmitted over the physical medium. Which PDU should they examine?
APacket
BFrame
CSegment
DBit
Step-by-Step Solution
Solution:

  1. Step 1: Identify layer before Physical transmission

    The Data Link layer prepares data for the Physical layer.

  2. Step 2: Determine PDU at Data Link layer

    The PDU at Data Link layer is a Frame, which is sent to Physical layer as Bits.

  3. Step 3: Confirm PDU before physical transmission

    Frames are the last complete data units before conversion to Bits.

  4. Final Answer:

    Frame -> Option B

  5. Quick Check:

    Last PDU before Physical layer = Frame [OK]
Quick Trick: Check Frames before data hits Physical layer [OK]
Common Mistakes:
MISTAKES
  • Choosing Packet or Bit instead of Frame
  • Confusing Physical layer PDU

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