What field is created by a source node to ensure data integrity during transmission?

What field is created by a source node to ensure data integrity during transmission?

• A. Frame check sequence field
• B. Header checksum field
• C. Data payload field
• D. Time-to-live field

Answer: (A)

The field created by a source node to ensure data integrity during transmission is the frame check sequence field. This field is used in networking protocols to verify that the data has not been altered during transmission. When a frame is constructed, the sender calculates a value based on the contents of the data being sent and incorporates it into the frame check sequence field. This value is derived from performing a cyclic redundancy check (CRC). When the frame reaches the destination, the receiver computes its own CRC value based on the received data and compares it to the frame check sequence field. If the two values match, it indicates that the data was transmitted without errors; if they do not match, it suggests that there were errors during transmission. Other options do not specifically relate to ensuring data integrity in the same way. Header checksums are used in different protocols (like IP) but don't apply at the frame level. The data payload field contains the actual data being sent, and the time-to-live field serves to prevent packets from circulating indefinitely in the network rather than ensuring data integrity. Thus, the primary function of the frame check sequence field is critical for maintaining the accuracy and reliability of data transmission in networking.

The field created by a source node to ensure data integrity during transmission is the frame check sequence field. This field is used in networking protocols to verify that the data has not been altered during transmission.

When a frame is constructed, the sender calculates a value based on the contents of the data being sent and incorporates it into the frame check sequence field. This value is derived from performing a cyclic redundancy check (CRC). When the frame reaches the destination, the receiver computes its own CRC value based on the received data and compares it to the frame check sequence field. If the two values match, it indicates that the data was transmitted without errors; if they do not match, it suggests that there were errors during transmission.

Other options do not specifically relate to ensuring data integrity in the same way. Header checksums are used in different protocols (like IP) but don't apply at the frame level. The data payload field contains the actual data being sent, and the time-to-live field serves to prevent packets from circulating indefinitely in the network rather than ensuring data integrity. Thus, the primary function of the frame check sequence field is critical for maintaining the accuracy and reliability of data transmission in networking.