DATA LINK LAYER WIRED NETWORKS
MULTIPLE ACCESS PROTOCOLS MAC
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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used to synchronize machines
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used as an entry point
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used for error correction
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used for error control
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Detailed explanation-1: -The preamble field is 7 bytes long. It contains a string of 7 bytes. Each byte alternatively stores 1 and 0 to make the pattern ‘10101010’. Preamble bytes help the receiving device to identify the beginning of an Ethernet frame.
Detailed explanation-2: -There is no preamble in the fields shown in Wireshark. The preamble is a physical layer mechanism to help the NIC identify the start of a frame. It carries no useful data and is not received like other fields. There is a destination address and a source address.
Detailed explanation-3: -The primary fields in the Ethernet frame are: Preamble and Start Frame Delimiter Fields: The Preamble (7 bytes) and Start Frame Delimiter (SFD), also called the Start of Frame (1 byte), fields are used for synchronization between the sending and receiving devices.