NWC203c BĐFC Course 2 Questions And Answers Latest Study Solutions
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Module
NWC203c
Institution
NWC203c
NWC203c BĐFC Course 2 Questions And Answers Latest Study Solutions
In networks where errors are infrequent, which approach is favored for efficiency?
a. Hop-by-hop approach
b. End-to-end approach
c. Either one of the above
d. Neither one of the above ANS b
Which of the following statement...
NWC203c BĐFC Course 2 Questions And Answers
Latest Study Solutions
In networks where errors are infrequent, which approach is favored for efficiency?
a. Hop-by-hop approach
b. End-to-end approach
c. Either one of the above
d. Neither one of the above ANS b
Which of the following statements is true about the stop-and-wait ARQ protocol?
a. Stop-and-wait is only efficient if the link bandwidth is high
b. Stop-and-wait is only efficient if the link delay-bandwidth product is large
c. Stop-and-wait is only efficient if the link delay-bandwidth product is small
d. Stop-and-wait is only efficient if the link bandwidth is low ANS c
Consider a situation where an interactive application produces a packet to send each keystroke from
the client and the server echoes each keystroke that it receives from the client. Which of following
strategies for sending ACK frames in a Go-Back-N is appropriate for the situation?
a. send an ACK frame immediately after each frame is received
b. send an ACK frame after every other frame is received
c. send an ACK frame when the next piggyback opportunity arises
d. Any one of the above ANS c
Consider a bulk data transfer application where a server sends a large file that is segmented in a
number of full-size packets that are to be transferred to the client. Assume the channel has a low
probability of error. Which of following strategies for sending ACK frames in a Go-Back-N is
appropriate for the situation?
a. send an ACK frame immediately after each frame is received
b. Any one of the above
c. send an ACK frame after every other frame is received
d. send an ACK frame when the next piggyback opportunity arises ANS c
,Consider Selective Repeat ARQ flow control protocol. In the following scenario, what should be the
value of frame number x at receiver B?
a. 2
b. 3
c. 4
d. none ANS c
ARQ protocols combine error detection, retransmission and sequence numbering to provide
reliability
a. True
b. False ANS a
A service model specifies a level of performance that can be expected in the transfer of information.
a. True
b. False ANS a
A service offered at a given layer can include which of the following feature(s)
a. Sequencing
b. Reliability
c. Timing
d. All of the above ANS d
Digital communication technologies may introduce errors in communication, which of the following
can be used to provide reliable communication (2 answers)
a. TCP
b. UDP
c. HDLC
d. DNS ANS ac
, Ensuring that information is not altered during transfer is associated with
a. Availability
b. Confidentiality
c. Authentication
d. Integrity ANS d
Given 3 bits for sequence numbers, what is the maximum sliding window size at the receiver in Go
Back 3 ARQ?
a. 3
b. 7
c. 8
d. None of the above ANS b
Given 3 bits for sequence numbers in Selective Repeat ARQ. If the sender already set the sliding
window size to be 4, what is the maximum sliding window size at the receiver?
a. 3
b. 7
c. 8
d. None of the above ANS d
Consider Selective Repeat ARQ flow control protocol. In the following scenario, what should be the
value of frame number x at receiver B?
a. 3
b. 2
c. 4
d. none ANS b
In the scenario above, what should be the value of frame number y at receiver B?
a. 3
b. 7
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