Practice Quiz

Advanced Networking Administrator Test Prep

Category - CCNA

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Two computers are communicating using a TCP protocol. The receiving host has failed to receive all of the segments that should be acknowledged. Which of the following can the host do to improve the reliability of this communication session?
  1. Restart a new session using UDP.
  2. Use a different source port for the session.
  3. Decrease the sequence number.
  4. Decrease the window size.
Explanation
Answer: D - To improve the reliability of the communication session, you should decrease the window size.

Key Takeaway: The TCP window size specifies the amount of outstanding data a sender can send on a particular connection before it gets an acknowledgment back from the receiver. The primary reason for the window is congestion control. The buffer to fill up the received data may fill faster than the receiving TCP can empty it. When this occurs, the receiving device may need to adjust the window size to prevent the buffer from being overloaded. This is when the window will be resized.
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