Briefly describe the following fields in the PPP header and trailer: Flag, protocol identifier, and Frame Check Sequence.
What will be an ideal response?
Flag: A single-byte delimiter field set to 0x7E (binary value: 01111110) to indicate the boundary between the end of one PPP frame and the beginning of another PPP frame. Unlike SLIP, only a single Flag value appears between frames.
Protocol identifier: A two-byte field that identifies the upper-layer protocol ferried by the PPP frame.
Frame Check Sequence (FCS): A two-byte field that provides bit-level integrity checks for data as sent. (It's recomputed upon receipt, then compared to the sent value; if the two values agree, the assumption is that the data was transmitted successfully; if they disagree, the payload is discarded.)
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