Hi guys can someone help me with these 2 question? 1. Suppose the original size

Question

Hi guys can someone help me with these 2 question?

1. Suppose the original size of a user message is 90 bytes and each of the three layers add a header of 20 bytes to the data. What percentage of the message being transmitted is not part of the original user message?

2. If the throughput (i.e., data rate) of a connection between hosts A and B is 4Mbps, the distance between them is 600 km, and the propagation delay between them is 6 microsec/km. How many microseconds does it take to transmit 1000 bytes from A to B?

Thank you in advance guys.

Explanation / Answer

1) Given that original size of message = 90 bytes.
Given that at each layer added header size = 20 bytes.
Then the resultant size = 920 + 3(20) = 150 bytes
Then percentage of the message being transmitted is not part of the original user message will be,
=> (90/150)*100 = 60%

2) Given that band width = 4Mbps
Distance = 600km
propagation delay = 6microsec/km
no.of bits = 1000 * 2^3
Transmission time = no.of bits/band width = 1000 * 2^3 / 4*10^6 = 8/(4*10^3) = 2*10^-3 sec = 2 ms
slot time = 2*6 = 12 microsec
total time =2*slottime +2*Tp+Tt
= 2*12 + 2*6 + 2
= 38 ms.

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