Topic: Computer Networks
For internal data communication through computer network, a 5 layer protocol hierarchy is proposed. Applications to be used in this network generate 270 bytes long messages. At each of the layers, a 6-byte header is added. What fraction of network bandwidth(in %) is wasted due to headers?
- A. 5%
- B. 20%
- C. 10%
- D. 15%
Answer: C. 10%
Explanation: Payload size = 270 bytes. There are 5 layers, each adding a 6-byte header, so total header overhead = $5 \times 6 = 30$ bytes. The total message size = $270 + 30 = 300$ bytes. The fraction of bandwidth wasted by headers = $(30 / 300) \times 100\% = 10\%$.