# Computer Networking : A Top-down Approach

 Authors: James F. Kurose, Keith W. Ross ISBN: 9780132856201 Edition: 6
 Chapter: Computer Networks And The Internet Exercise: Problems Question: 34

### Question by Anonymous on 21 Sep, 2016 at 05:57 AM

Consider sending a large file of bits from Host Ato Host B. There are three links (and two switches) between Aand B, and the links are uncongested (that is, no queuing delays). Host Asegments the file into segments of bits each and adds 80 bits of header to each segment, forming packets of = 80 + bits. Each link has a transmission rate of bps. Find the value of that minimizes the delay of moving the file from Host Ato Host B. Disregard propagation delay.

### Answer by Geroge on 16 Oct, 2018 at 01:58 AM

Consider the given data:

Number of switches=2

File size=F bitsze of each Segment= S bits

Number of segments=F/S

Packet size(L)=80+S bits

Transmission rate(R)=R bps

Transmission delay(Tdelay)=L/R

=(80+S)/R  seconds

Time (T) required for the first packet to be transmitted to destination:

=(80+S)/R *3  ### Discussions

Post the discussion improve the above solution.