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MCQs

Total Questions : 26 | Page 3 of 3 pages
Question 21.

For which one of the following reason: does Internet Protocol (IP) use the time-to-live (TTL) field in the IP datagram header?


  1.    Ensure packets reach destination within that time
  2.    Discard packets that reach later than that time
  3.    Prevent packets from looping indefinitely
  4.    Limit the time for which a packet gets queued in intermediate routers
 Discuss Question
Answer: Option B. -> Discard packets that reach later than that time

IP use TTL (Time to Live) field in IP datagram header to check whether the datagram is later than its correct reach time.So if current time is greater than TTL then discard the packet.


Question 22.

In Go-Back N ARQ protocol maximum size of the send window is:


  1.    2^m
  2.    2^(m/2)
  3.    2^m - 1
  4.    2^(m-1)
 Discuss Question
Answer: Option A. -> 2^m



Question 23.
If delays are recorded as 10 bit numbers in a 50 router network, and
delay vectors are exchanged twice a second, how much bandwidth per
fill duplex line is occupied by the distributed routing algorithm?



  1.    500 bps
  2.    1500 bps
  3.    5 bps
  4.    1000 bps
 Discuss Question
Answer: Option D. -> 1000 bps


Question 24.
The probability that a single bit will be in error on a typical public
telephone line using 4800 bps modem is 10 to the power -3. If no
error detection mechanism is used, the residual error rate for a
communication line using 9-bit frames is approximately equal to



  1.    0.003
  2.    0.009
  3.    0.991
  4.    0.999
 Discuss Question
Answer: Option B. -> 0.009


Question 25.

Which one of the following uses UDP as the transport protocol?


  1.    HTTP
  2.    Telnet
  3.    DNS
  4.    SMTP
 Discuss Question
Answer: Option C. -> DNS

HTTP & SMTP uses TCP to make calls. DNS which is used for mapping names to IP addresses uses UDP to make function calls.



Question 26.

In which topology, if there are n devices in a network, each device has n-1 ports for cables?


  1.    Mesh
  2.    Star
  3.    Bus
  4.    Ring
 Discuss Question
Answer: Option A. -> Mesh


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