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What is start frame delimeter (SFD) in ethernet frame?

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What is start frame delimeter (SFD) in ethernet frame?

(a) 10101010

(b) 10101011

(c) 00000000

(d) 11111111

I had been asked this question during a job interview.

This intriguing question comes from Ethernet in section Network Layer of Computer Network

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The correct option is (b) 10101011

For explanation: The start frame delimiter is a 1 byte field in the Ethernet frame that indicates that the preceding bits are the start of the frame. It is always set to 10101011.

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