Fields in an Ethernet Frame

AE

The two fields in an Ethernet frame are the header and the frame check sequence (FCS).

1. Header: The header is located at the beginning of the Ethernet frame and contains several fields. The most important fields are:

• Destination MAC Address: This field specifies the MAC address of the device that should receive the Ethernet frame.
• Source MAC Address: This field specifies the MAC address of the device that sent the Ethernet frame.
• Type: This field specifies the type of data contained in the Ethernet frame. For example, it could be IP data or another type of protocol data.

2. Frame Check Sequence (FCS): The FCS is located at the end of the Ethernet frame and is used to verify the integrity of the data contained in the Ethernet frame. The FCS is a 32-bit cyclic redundancy check (CRC) that is calculated by the sending device and appended to the Ethernet frame. The receiving device recalculates the CRC and compares it to the FCS that was sent. If the values match, the data in the Ethernet frame is considered to be intact.

On the other hand, source IP address and destination IP address are fields used in the Internet Protocol (IP) layer, which operates at a higher level than Ethernet. Ethernet frames do not contain IP addresses.

In summary, Ethernet frames consist of a header, which contains information about the source and destination devices, the type of data being transmitted, and other information, and a frame check sequence, which is used to verify the integrity of the data in the frame.