Practice Quiz

Advanced Networking Administrator Test Prep

Category - CCNA

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How does the Data link layer of the OSI Model accomplish error checking?
  1. 3-byte Frame Check Sequence (FCS)
  2. 5-byte Frame Check Sequence (FCS)
  3. 6-byte Frame Check Sequence (FCS)
  4. 4-byte Frame Check Sequence (FCS)
Explanation
Answer: D - Data link layer uses a 4-byte Frame Check Sequence (FCS).

Key Takeaway: The FCS field of the frame is used to carry a 4-byte CRC polynomial. The CRC checks the validity of the received frame and can indicate when any bit errors have occurred during the transmission and reception. This counter is incremented when a frame is received with a invalid frame check sequence.
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