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?
- User Datagram Protocol field
- transport layer error check field
- flow control field
- frame check sequence field
- error correction process field
Explanation: The frame check sequence (FCS) field is a critical part of the data link layer frame trailer used for error detection. During the encapsulation process, a source node performs a mathematical calculation known as a cyclic redundancy check (CRC) on the frame's contents and places the resulting value into the FCS field. The destination node performs the same calculation upon receiving the frame; if the results do not match the value in the FCS field, it indicates that the data has been altered during transmission. This alteration is often caused by external physical factors such as interference, distortion, or signal loss occurring on the network media. By identifying these discrepancies, the data link layer can reject and discard corrupt frames to ensure that only valid data is passed up to the higher layers of the protocol stack.
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