Station A needs to send a message consisting of 9

0

Station A needs to send a message consisting of 9 packets to Station B using a  sliding window (window size 3) and go-back-n error control strategy. All packets are ready and immediately available for transmission. If every 5th packet that A transmits gets lost (but no acks from B ever get lost), then what is the number of packets that A will transmit for sending the message to B?
(A) 12
(B) 14
(C) 16
(D) 18

Ravi Garg edited question
    0
    Sonali Kapoor (anonymous)
    Sender      Receiver
     1            
     2            1
     3            2
     4            3
     5            4
     6           
     7            6
                  7             
              [Timeout for 5] 
    
     5
     6            5
     7            6
     8
     9           
                  8
                  9
              [Timeout for 7]
    
     7           
     8            7
     9            8
    
    
             [Timeout for 9]
     9           
                  9
    Sonali Kapoor answered
      0
      Ravindra Reddy (anonymous)

      1,2,3,4,5,6,7[Time out],5,6,7,8,9[Time out],7,8,9,9

      Ravindra Reddy answered
        0
        Prasanna Lakshmi (anonymous)

        is it b??

        Prasanna Lakshmi answered
          0
          Ravindra Reddy (anonymous)

          16 is the answer m sure our coachin teacher solved it this question haunted me a lot

          1234567 timme out since window size is 3 it can have 3 unacknowl frames therfore even 5 acknow. doesnt arrive 6n7 are sent and after 7 is sent timer for 5 expires causing it to send 567 in its window

          Ravindra Reddy answered
            Add image to editor add image from link

            Question stats

            • Active
            • Views355 times
            • Answers4 answers
            • Followers1 follower
            Question and answer is powered by AnsPress