MadeEasy Test Series: Computer Networks - Flow Control Methods

Question

Station X needs to send a message consisting of 12 packets to station Y using a sliding window protocol (Window Size 4) and Go back n error control strategy. All packets are ready and immediately available for transmission. If every 7th packet that X transmits gets lost (but no acks from Y ever gets lost), then the number of packets that X will transmit for sending the message to Y are _____.

Comments

You are right ...19 is the ans

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thks

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19 is the correct answer. 

Packet Number

1

2

3

4

5

6

7

8

9

10

7

8

9

10

11

12

10

11

12

Answer 1

19 packets to be sent in total.

Comments

plz explain

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1 2 3 4 5 6 7(lost) 8 9 10 7 8 9 10(lost) 11 12 10 11 12
When a packet is getting lost, we should retransmit the entire window of 4 packets.
So, 19 transmissions.