Question 1
In networks where errors are infrequent, which approach is favored for efficiency?
Answer:
End-to-end approach
Question 2
Which of
the following statements is true about the stop-and-wait ARQ protocol?
Answer:
Stop-and-wait is only efficient if the link delay-bandwidth product is small
3.
Question 3
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?
Answer:
send an ACK frame when the next piggyback opportunity arises
Question 4
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?
Answer:
send an ACK frame after every other frame is received
Question 5
Consider
Selective Repeat ARQ flow control protocol. In the following scenario, what
should be the value of frame number x
at receiver B?
Answer:
4
Question 6
ARQ protocols combine error detection, retransmission and sequence numbering to provide reliability
Answer:
True
7.
Question 7
A service model specifies a level of performance that can be expected in the transfer of information.
Answer:
True
8.
Question 8
A service offered at a given layer can include which of the following feature(s)
Answer:
All of the above
Question 9
Digital communication technologies may introduce errors in communication, which of the following can be used to provide reliable communication
Answer:
TCP
Question 10
Ensuring that information is not altered during transfer is associated with
Answer:
Integrity