100-150: Cisco Certified Support Technician (CCST) NetworkingDemo

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QuestionQ60

Networking Fundamentals

During data encapsulation, which OSI layer appends a header containing MAC addressing information and a trailer for error checking?

  • A Network
  • B Transport
  • C Session
  • D Data Link
Explanation

The Data Link layer creates frames by adding a header with source and destination MAC addresses and a trailer containing error-detection information, typically a Frame Check Sequence (FCS) based on CRC.

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