Which frame field is created by a source node and used by a destination node to ensure that a transmitted data signal has not been altered by interference, distortion, or signal loss?
- transport layer error check field
- error correction process field
- flow control field
- User Datagram Protocol field
- frame check sequence field
| Explanation & Hint:
The frame field created by a source node and used by a destination node to ensure that a transmitted data signal has not been altered by interference, distortion, or signal loss is the frame check sequence (FCS) field. The FCS field contains a number that is calculated by the source node based on the data in the frame. This number is derived using a predetermined formula—typically a cyclic redundancy check (CRC). The destination node performs the same calculation on the received data and compares the result to the value contained in the incoming frame’s FCS field. If the numbers match, the frame is considered to be intact and free of errors. If there is a discrepancy, it indicates that the data has been altered in transit, and the frame is usually discarded. |