Question:
Consider the 802.3 MAC frame fields from left to right :
A. Preamble
B. Source address
C. SFD
D. Destination address
Choose the correct answer from the options given below :
Consider the 802.3 MAC frame fields from left to right :
A. Preamble
B. Source address
C. SFD
D. Destination address
Choose the correct answer from the options given below :
A. Preamble
B. Source address
C. SFD
D. Destination address
Choose the correct answer from the options given below :
Show Hint
Ethernet is "polite" in a networking sense: it first announces it's talking (Preamble/SFD), then says WHO it wants to talk to (Destination), and only then identifies WHO is talking (Source).
Updated On: Jun 6, 2026
- A, C, D, B
- A, C, B, D
- D, B, C, A
- B, D, C, A
Show Solution
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The Correct Option is A
Solution and Explanation
The IEEE 802.3 (Ethernet) frame has a standard header format. "Left to right" indicates the sequence in which the fields are transmitted over the network.
1. Sequence of Fields:
• Preamble (A): 7 bytes of alternating 0s and 1s to synchronize the receiver's clock. This is always the very first field.
• SFD - Start Frame Delimiter (C): 1 byte ($10101011$) that signals the end of the preamble and the start of the actual frame data.
• Destination Address (D): 6 bytes. The Ethernet protocol prioritizes where the packet is going so routers can start processing early.
• Source Address (B): 6 bytes. Identifies the sender's MAC address. 2. Resulting Order: The correct transmission sequence is Preamble (A) $\to$ SFD (C) $\to$ Destination Address (D) $\to$ Source Address (B).
• Preamble (A): 7 bytes of alternating 0s and 1s to synchronize the receiver's clock. This is always the very first field.
• SFD - Start Frame Delimiter (C): 1 byte ($10101011$) that signals the end of the preamble and the start of the actual frame data.
• Destination Address (D): 6 bytes. The Ethernet protocol prioritizes where the packet is going so routers can start processing early.
• Source Address (B): 6 bytes. Identifies the sender's MAC address. 2. Resulting Order: The correct transmission sequence is Preamble (A) $\to$ SFD (C) $\to$ Destination Address (D) $\to$ Source Address (B).
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