Look at the network communication scenario using TCP fast retransmit as shown in the following figure. The first packet Seq=100 arrives at the B successfully, but the second packet Seq = 110 with length 20 bytes was lost.a. Please tell what are the values for ACK1, ACK2, ACK3, ACK4, and Seq1 respectively?b. How many bytes are retransmitted finally? 1. Look at the network communication scenario using TCP fast retransmit asshown in the following figure. The first packet Seq=100 arrives at the Bsuccessfully, but the second packet Seq = 110 with length 20 bytes waslost.Host AtimeoutSeq=100, 10 bytes of dataSeq=110, 20 bytes of data→XACK1=ACK2=ACK3=ACK4=Host BSeq1=bytes of dataa. Please tell what are the values for ACK1, ACK2, ACK3, ACK4, and Seq1respectively?b. How many bytes are retransmitted finally?

Answered: Look at the network communication…

Database System Concepts

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ISBN:9780078022159

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Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

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Look at the network communication scenario using TCP fast retransmit as shown in the following figure. The first packet Seq=100 arrives at the B successfully, but the second packet Seq = 110 with length 20 bytes was lost.

a. Please tell what are the values for ACK1, ACK2, ACK3, ACK4, and Seq1 respectively?

b. How many bytes are retransmitted finally?

1. Look at the network communication scenario using TCP fast retransmit as
shown in the following figure. The first packet Seq=100 arrives at the B
successfully, but the second packet Seq = 110 with length 20 bytes was
lost.
Host A
timeout
Seq=100, 10 bytes of data
Seq=110, 20 bytes of data
→X
ACK1=
ACK2=
ACK3=
ACK4=
Host B
Seq1=
bytes of data
a. Please tell what are the values for ACK1, ACK2, ACK3, ACK4, and Seq1
respectively?
b. How many bytes are retransmitted finally?

Expert Solution

Step 1

First segment is successfully receive by receiver. Thus Ack = X = 110 which tell the next expected byte by Host B.

Now the second segment is lost and A is not aware of this and send 3rd , 4th, 5th segment. But host B will always acknowledege for the segment it is expecting which is Packet with sequence number 110.

So the next 3 acknowledgment will be same.

So ACK1 = ACK2 = ACK3 = ACK = 110.

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b. How many bytes are retransmitted finally?

Is the answer 20 ?

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