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Ethernet Frames, Data Packets, and Type Codes

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  • The following lab assignment was done in my Networking Devices course.  I used a software called Wireshark to analyze and gain a comprehensive understanding of different packet types with their associated Type Codes.
  • This is an example of an Ethernet Frame with the data (packet) embedded in the frame.  The first 6 bytes (48 bits) are the Destination MAC Address, the next 6 bytes (48 bits) are the Source MAC Address, the next 2 bytes are the Ethernet Type Code which identifies what type of packet is embedded in the frame, the data or packet itself can range from 46-1500 bytes, and the last 4 bytes are the CRC Checksum to ensure error correction.
  • This Wireshark Screenshot shows the capture of an ARP Packet with type code 0806.
  • This Wireshark Screenshot shows a TCP Packet with the associated Type Code of 0800.
  • This Wireshark Screenshot shows a LOOPBACK/CTP (Configuration Test Protocol) packet with the associated Type Code of 9000.