Electronic Engineering homework help

Consider a source S and a destination D using the Selective Repeat Protocol (SRP) with a window size of N=4N=4. Each packet is 10001000 bits.
The delays are as follows:

  • Each packet transmitted by S has a transmission time of 10 ms10ms.
  • The end-to-end delay from the time that S starts transmitting a packet until D completely receives that packet is 100 ms100ms.
  • Each ack transmitted by D has a transmission time of 1 ms1ms.
  • The end-to-end delay from the time that D starts transmitting an ack until S completely receives that ack is 100 ms100ms.
  • The timeout value is 300 ms300ms.

Here is what happens to each packet:

  • Packet #0 is received by D, and the corresponding ACK is received by S.
  • The first transmission of packet #1 is dropped by a router in between S and D.
  • The second transmission of packet #1 is received by D, and the corresponding ACK is received by S.
  • The first transmission of packet #2 is dropped by a router in between S and D.
  • The second transmission of packet #2 is received by D, and the corresponding ACK is received by S.
  • Packet #3 is received by D, and the corresponding ACK is received by S.
  • Packet #4 is received by D, and the corresponding ACK is received by S.
  • Packet #5 is received by D, and the corresponding ACK is received by S.

(a) At time t = 150 mst=150ms, what is S’s window?
(b) At what time does the retransmission of packet #1 start?
(c) At what time does the application layer at D receive packet #2?
(d) What is the throughput during the time from t = 0 mst=0ms until t = 500 mst=500ms?
Write your answers for parts (a)-(d) (as well as any diagram or equations use to obtain your answers) on paper, and upload the image here:

Save your time - order a paper!

Get your paper written from scratch within the tight deadline. Our service is a reliable solution to all your troubles. Place an order on any task and we will take care of it. You won’t have to worry about the quality and deadlines

Order Paper Now