Cisco
200-301 · Question #134
Which component of an Ethernet frame is used to notify a host that traffic is coming?
The correct answer is C. preamble. 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.
Submitted by eva_at· Mar 5, 2026Network Fundamentals
Question
Which component of an Ethernet frame is used to notify a host that traffic is coming?
Options
- Astart of frame delimiter
- BType field
- Cpreamble
- DData field
How the community answered
(43 responses)- A2% (1)
- B2% (1)
- C91% (39)
- D5% (2)
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.
Topics
#Ethernet frame#preamble#frame structure#Layer 2
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