25. What is the transmission efficiency of a 10-byte Web request sent using HTTP

Question

25. What is the transmission efficiency of a 10-byte Web request sent using HTTP, TCP/IP, and Ethernet? Assume the HTTP packet has 100 bytes in addition to the 10-byte URL. Hint: Remember from Chapter 4 that efficiency = user data/total transmission size.


26. What is the transmission efficiency of a 1,000-byte file sent in response to a Web request HTTP, TCP/IP, and Ethernet? Assume the HTTP packet has 100 bytes in addition to the 1,000-byte file. Hint: Remember from Chapter 4 that efficiency = user data/total transmission size.


27. What is the transmission efficiency of a 5,000-byte file sent in response to a Web request HTTP, TCP/IP, and Ethernet? Assume the HTTP packet has 100 bytes in addition to the 5,000-byte file. Assume that the maximum packet size is 1,200 bytes. Hint: Remember from Chapter 4 that efficiency = user data/total transmission size.

Explanation / Answer

“Transmission efficiency is defined as the total number of information bits (i.e. bits in the message sent by the user) divided by the total bits in transmission (i.e. information bits plus overhead bits).”

Header added is 100bytes using HTTP.

Transmission efficiency is: 110/(100+10)*100 =100%

       Header added = 24 bytes using TCP/IP

      Transmission efficiency is : 10/ 34*100 = 82.09%

3.   Ethernet frame format:

Data transmitted: 134 bytes.

Header added is 38 bytes.

Transmission efficiency is: 134/172 *100 = 77.9%

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