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Two networks each provide reliable connection-oriented service. One of them offers a reliable byte stream and the other offers a reliable message stream. A process writes 1024 bytes, then

  • A.both networks will receive 2048 bytes as a single unit
  • B.message stream network will receive 1024 bytes only at one time. But byte stream network will receive 2048 bytes as a single unit.
  • C.message stream network receives 2048 bytes as a whole. But bytes stream 1024 bytes only at a time.
  • D.both will receive 1024 bytes at one time since there is a gap between writes

Answer: B

Correct answer: message stream network will receive 1024 bytes only at one time

A message stream preserves the boundaries the sender wrote, so two writes of 1024 bytes arrive as two separate messages. A byte stream keeps no boundaries at all, so the same two writes may be read as one block of 2048 bytes, or in any other division.

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