A 120-byte message is sent through a private internet using the TCP/IP protocol suite (IPv4). If the protocol adds a 15-byte header at each layer (assume headers are added only at layers 5, 4, 3, and 2), what is the efficiency of the system (the ratio of the number of useful bytes to the number of total bytes)?
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The correct answer is 55.5% efficiency.
Explanation:
- Since we a 120-byte message and the protocol we are using is IPv4. An additional 15-byte header is being added per layer.
- The header is only being added on 4 layers i.e 5,4,3 and 2.
- So this gives us, 120 bytes plus 15 bytes per layer header with 4 headers.
- Hence the total becomes 180 bytes.
- To find efficiency we divide 100 / 180 = 55.5% efficiency
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