1.1) The bytes inside a TCP sender\'s sliding window A) have been received, ackn

Question

1.1) The bytes inside a TCP sender's sliding window

A)    have been received, acknowledged and consumed

B)    can’t be sent yet

C)    can be sent or have been sent but not yet acknowledged

D)    have already been sent and acknowledged

      1.2 Why does TCP calculate the round trip time?

            a. It is used to adjust the size of the receiving window

            b. It is used to adjust the time-out period

            c. It is used to avoid silly window syndrome

            d. It is sent in the TCP header

      1.3 Which host is responsible for flow control?

a. Sender      b. Receiver     c. Both           d. Neither, this is handled by routers

      1.4 What does TCP do to the time-out period if there is congestion?

A)    Decreases it to make sure that all delayed segments are promptly re-sent

B)    Keeps it the same

C)    Increases it to reduce re-transmissions, which should reduce network congestion

      1.5 The TCP sender may decrease the congestion window size if

A)    the receiver’s application is consuming data slower than the data is arriving

B)    it detects network congestion

C)    the checksum in the TCP header is incorrect

       1.6 What is a disadvantage if the TCP timeout is too short?

A)    The sender will do nothing while waiting for the timer to time-out

B)    The receiver window size will get too big

C)    The sender will unnecessarily time out and resend data

D)    The TCP connection will be closed to early

Explanation / Answer

1.1) The bytes inside a TCP sender's sliding window Ans: C

A)    have been received, acknowledged and consumed

B)    can’t be sent yet

C)    can be sent or have been sent but not yet acknowledged

D)    have already been sent and acknowledged

1.2 Why does TCP calculate the round trip time? Ans: B

            a. It is used to adjust the size of the receiving window

            b. It is used to adjust the time-out period

            c. It is used to avoid silly window syndrome

            d. It is sent in the TCP header

      1.3 Which host is responsible for flow control? Ans: C

a. Sender      b. Receiver     c. Both           d. Neither, this is handled by routers

1.4 What does TCP do to the time-out period if there is congestion? Ans: C

A)    Decreases it to make sure that all delayed segments are promptly re-sent

B)    Keeps it the same

C)    Increases it to reduce re-transmissions, which should reduce network congestion

1.5 The TCP sender may decrease the congestion window size if Ans: A.

A)    the receiver’s application is consuming data slower than the data is arriving

B)    it detects network congestion

C)    the checksum in the TCP header is incorrect

1.6 What is a disadvantage if the TCP timeout is too short? Ans: C

A)    The sender will do nothing while waiting for the timer to time-out

B)    The receiver window size will get too big

C)    The sender will unnecessarily time out and resend data

D)    The TCP connection will be closed to early

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