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Authors:
James F. Kurose, Keith W. Ross
Chapter:
The Link Layer: Links,access Networks, And Lans
Exercise:
Review
Question:13 | ISBN:9780132856201 | Edition: 6

Question

Compare the frame structures for 10BASE-T, 100BASE-T, and Gigabit Ethernet. How do they differ?

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Answer

10BASE-T, 100BASE-T and Gigabit Ethernet have identical frame structure.

 

The only difference between the three technologies is speed at which they transmit the data.

 

The fields in the Ethernet frame structure are as follows:

  • The “Data Field” is used to carry IP datagram and size is 46 to 1500 bytes.
  • The “Destination Address Field” contains destination adapter’s MAC address and size is 6 bytes.
  • The “Source Address Field” contains adapter’s MAC address that sends the frame to LAN and size is 6 bytes.
  • The “Type2 Field” helps the Ethernet to connect with multiplex network – layer protocols and size is 2 bytes.
  • The “Cycle Redundancy Check (CRC) field”, is used to detect the errors using the CRC field and size is 4 bytes.
  • The “Preamble field” is the first field used to identify the beginning of the Ethernet frame and size is 8 bytes.
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