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Which of the following statements are TRUE?

  • S1:  TCP handles both congestion and flow control
  • S2:  UDP handles congestion but not flow control
  • S3:  Fast retransmit deals with congestion but not flow control
  • S4:  Slow start mechanism deals with both congestion and flow control
  1. $S1$, $S2$ and $S3$ only
  2. $S1$ and $S3$only
  3. $S3$and $S4$ only
  4. $S1$, $S3$ and $S4$ only
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(S1)  TCP handles both congestion and flow control $\Rightarrow$ True.
 It uses congestion window for congestion control & Advertisement window for flow control
(S2)  UDP handles congestion but not flow control $\Rightarrow$ UDP does not handle
congestion but also not handle flow control.
(S3)  Fast retransmit deals with congestion but not flow control$\Rightarrow$ Yes.
Fast Retransmit is technique for detecting out of Order Datagram & Sending it.
It is congestion control technique and has no relation with Flow control
(S4)  Slow start mechanism deals with both congestion and flow control $\Rightarrow$ False.
It has nothing to do with Flow control. Flow control is taken care by Advertisement window.
Slow start is way Sender tries to gauge network capacity !
Answer (B) S1 and S3 only.

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Tcp handles both Congestion Control and Flow Control. For Flow Control it uses Sliding Window Protocol Algorithms and for Congestion Control it uses four congestion control algorithms: slow start, congestion avoidance, fast re-transmit, and fast recovery.

So Option (B)

Answer:

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