Cisco Certified Network Associate (200-301 CCNA) – Question048

Which component of an Ethernet frame is used to notify a host that traffic is coming?

A. start of frame delimiter
B. Type field
C. preamble
D. Data field

Correct Answer: C

Explanation:

Explanation:
Preamble is a 7 Byte field in the Ethernet frame which helps to receiver to know that it is an actual data (Ethernet Frame) and not some random noise in the transmission medium. It acts like a doorbell telling about the incoming data.

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