3.2-transport-tcp

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Questions and Answers

Which field in the TCP segment structure is used for congestion notification?

  • ACK
  • E (correct)
  • C
  • R

Which field in the TCP segment structure is used for connection management?

  • RST (correct)
  • C
  • E
  • ACK

Which field in the TCP segment structure is used for flow control?

  • R
  • E
  • C
  • ACK (correct)

Which state does the client transition to after calling clientSocket.close() in the TCP connection?

<p>FIN_WAIT_1 (C)</p>
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What is the value of ssthresh after dupACKcount reaches 3?

<p>cwnd/2 (A)</p>
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What is the purpose of the TIMED_WAIT state in the TCP connection?

<p>To allow the client to still send data (B)</p>
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What is the value of cwnd after retransmitting a missing segment and receiving a duplicate ACK?

<p>ssthresh + 3 (A)</p>
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Which of the following is true about TCP congestion control?

<p>TCP uses additive increase and multiplicative decrease to adjust sending rate (C)</p>
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During TCP slow start, the congestion window (cwnd) is initially set to _______?

<p>1 (C)</p>
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What is the purpose of the ssthresh variable in TCP congestion control?

<p>To switch from exponential increase to linear increase in cwnd (A)</p>
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What is the purpose of the dupACKcount variable in TCP congestion control?

<p>The <code>dupACKcount</code> variable is used to track the number of duplicate ACKs received by the sender in TCP congestion control.</p>
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What is the formula to calculate the new value of cwnd after receiving a duplicate ACK?

<p><code>cwnd = cwnd + MSS</code></p>
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What is the purpose of the ssthresh variable in TCP congestion control?

<p>The <code>ssthresh</code> variable is used to store the value of the congestion window (<code>cwnd</code>) at the time congestion is detected and reduced.</p>
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What is the formula to calculate the new value of ssthresh after dupACKcount reaches 3?

<p><code>ssthresh = cwnd/2</code></p>
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What are the possible states for a TCP connection in the Transport Layer?

<p>The possible states for a TCP connection in the Transport Layer are: ESTAB (established), FIN_WAIT_1, FIN_WAIT_2, CLOSE_WAIT, TIMED_WAIT, LAST_ACK, and CLOSED.</p>
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3.2-transport-tcp.pdf

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