Data Communication and Computer Network Assignment

  

1. Assume the following parameters for rdt 2.1: (7 points)

a) Round Trip Time (RTT) = 10 ms

b) A segment is 1500 bytes.

 

Suppose that Bob sends 4 segments to Alice using rdt 2.1. Suppose that the third segment reaches Alice with errors when it is sent the first time, but reaches Alice correctly when it is sent the second time. All other segments reach Alice correctly in their first attempts. What is the average throughput obtained in sending all the segments (in bytes/sec)? Draw a diagram to show your work. 

 

2. Resolve Problem 1 to find the average throughput (in bytes/sec) obtained in sending the 4 segments when Bob sends the segments using rdt 2.2. Assume again that the RTT is 10 ms and that a segment is 1500 bytes. Draw a diagram to show your work.  (7 points) 

 

3. Assume the following parameters for Go-Back-N:  (11 points)

a) For Go-Back-N, assume N = 3

b) Round Trip Time (RTT) = 10 ms

c) A segment is 1500 bytes.

Suppose that Bob sends 7 segments, numbered 1 through 7, to Alice using the Go-Back-N mechanism. What is the average throughput obtained in sending all segments (in bytes/sec)? Draw a diagram to show your work.