Question

in sliding window protocol total 8 packets are to send and if every 4th packet is lost then find the number of transmissions needed by the sender.
a) 10
b) 14
c) 16
d) 20

Answer 1

Answer:

In sliding window protocol total 8 packets are to send and if every 4th packet is lost then 10  transmissions needed by the sender.

Explanation:

• After four transmissions(i.e. for packets 1,2,3,4), acknowledgement will come for transmissions of packet 1,2 and 3. So again packet 4 will be transmitted.
• Hence, for packets 1,2,3, and 4 , total five transmissions are required.
• After transmitting the packet 4 for second time followed by packet 5 ,6 and 7, packet 7 will be missing and  transmitted twice.
• we can explain the packet transmission in the following way:

         1,2,3,4 ,4,5,6,7,7,8

  as  every 4th packet is lost, packet no 4 and 7 will be transmitted twice.

• Hence the total number of transmission is 10.

Answer 2

Answer:

The correct answer of this question is 10.

Explanation:

Given - Sliding window protocol total 8 packets are to send and if every 4th packet is lost ,

To Find  -  Find the number of transmissions needed by the sender.

In the sliding window protocol, a total of 8 packets must be sent, and if every fourth packet is lost, the sender must make 10 transmissions.

After four transmissions (i.e. for packets 1,2,3,4), acknowledgement will be sent for packets 1 and 2. As a result, packet 4 will be sent once more.

As a result, five transmissions are required for packets 1, 2, 3, and 4.

After sending packet 4 a second time, followed by packets 5, 6, and 7, packet 7 will be missing and sent twice.

The packet transmission can be explained as follows:

Because every fourth packet is lost, packets 4 and 7 will be transmitted twice.

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