Question

PLEASE HELP WITH THESE COMPUTER NETWORK QUESTIONS

THESE INCLUDE MCQS AND CALCULATIONS

1. With reference to the Go-Back-N and Selective repeat protocols, what does the window value signify?

2. 		The packets that have already been ACKed
   		The packets sent but remain unACKed
   		The sequence numbers available and not yet sent
   		The sequence numbers of packets not yet available
   		None of the above

1 points   

QUESTION 2

1. Which of the following is NOT a component of the TCP congestion control algorithm?

   		Slow Start
   		Congestion Avoidance
   		Congestion limitation
   		Fast Recovery
   		None, ALL the above form part of TCP s congestion control algorithm

1 points   

QUESTION 3

1. A process in Host A has a UDP socket with port number 6789. A process in Host B sends a UDP segment to Host A through port number 2254, while Host C sends a UDP segment to Host A through port number 5544. To what port number at Host A will the segments from Host B and Host C be directed?

   		Port number 2254
   		Port number 5544
   		Port number 6789
   		The segments will be directed to different port numbers that are assigned by the OS
   		None of the above

1 points   

QUESTION 4

1. What event/s could occur at the TCP senders side of a TCP transport protocol?

   		The timer expires
   		An ACK is received
   		A message is received from the application layer
   		A, B and C
   		None of the above

1 points   

QUESTION 5

1. Which of the following would explain why a programmer might choose to run an application over UDP rather than over TCP?

   		To prevent any throttling that may occur
   		To avoid congestion control
   		As reliable data delivery is not a high priority
   		A, B and C
   		None of the above

1 points   

QUESTION 6

1. What is used by the receiver to determine if a UDP segment has bit errors?

   		Sequence number
   		Timer
   		Checksum
   		ACK and NAK
   		None of the above

1 points   

QUESTION 7

1. The following 8-bit bytes exist in a UDP segment: 01010011, 01100110, 01110100. What will the checksum value in the segment.

   		00101101
   		00101110
   		11010001
   		11010010
   		None of the above

1 points   

QUESTION 8

1. In RDT2.2 the ACK that is sent from the receiver indicates:

   		All packets received are OK
   		The latest packet sent by the sender was received OK
   		Which is the latest packet to have been received OK
   		A, B & C
   		None of the above

1 points   

QUESTION 9

1. In which reliable data transfer protocol is the sequence number sent with the ACK as part of the arguments?

   		RDT2.0
   		RDT2.1
   		RDT2.2
   		A, B & C
   		None of the above

1 points   

QUESTION 10

1. With reference to TCP congestion control, when a timeout occurs, the value of cwnd is set to:

   		Half of its prior value
   		Half of the value of ssthresh
   		1
   		1 x Maximum segment size
   		None of the above

1 points   

QUESTION 11

1. Host A sends a segments of data to Host B over a TCP connection with sequence number x. Host B has no data to send back to Host A. Which of the following statements is TRUE?

   		Host B cannot send an acknowledgement back as Host B has no data to transmit
   		Host B will send an acknowledgement with the ACK value of x.
   		Host B will only send an ACK value with the next data packet that it needs to send
   		Host B will send an ACK value indicating the next sequence number it expects.
   		None of the above

1 points   

QUESTION 12

1. Host A sends a 4 byte TCP segment with sequence number 38 to Host B. What will be the ACK number of this segment?

   		39
   		42
   		43
   		Not able to determine
   		None of the above

1 points   

QUESTION 13

1. Which of the following is true regarding the use of the SYN flag in a segment header?

   		It is used for UDP segment transmission
   		It is used for TCP data transmission
   		It is used for TCP handshaking
   		A, B and C
   		None of the above

1 points   

Answer 1

1. None of above

2. Congestion Limitation

3.The segment will be directed to different port numbers that are assigned by OS .

4. A,B and C

5.As reliable data delivery is not a high priority.

6.Checksum

7. 11010001

8.A, B, and C

9.A,B,and C

10.1 x maximize the segment size

11. Host B will send an ACK value indicating the next sequence number it expects.

12. 42

13. It is used for TCP data transmission