How many bytes does the Source Address take in an Ethernet header?

In an Ethernet header, the Source Address is comprised of 6 bytes, which is equivalent to 48 bits. This format is standard for Ethernet frames, as defined by IEEE 802.3. Each byte in the address is represented by two hexadecimal characters, making the Source Address typically shown as a string of 12 hexadecimal digits (for example, 00:1A:2B:3C:4D:5E).

Understanding the composition of the Ethernet frame is critical for networking professionals. The Source Address plays a key role in identifying the device that is sending the data on the network, allowing for proper communication and data routing. Knowing that it occupies 6 bytes supports a deeper understanding of how network interfaces identify themselves and manage traffic within a local area network.