1. (a) Consider two hosts A and B, connected by a single link of rate R bps. Suppose that the two hosts are separated by m meters, and the propagation speed along the link is s meters/sec. Host A is to send a packet of size L bits to Host B. Show Transcribed Text

Operations Research : Applications and Algorithms
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Chapter20: Queuing Theory
Section20.10: Exponential Queues In Series And Open Queuing Networks
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1.
(a)
(b)
(c)
Consider two hosts A and B, connected by a single link of rate R bps.
Suppose that the two hosts are separated by m meters, and the
propagation speed along the link is s meters/sec. Host A is to send a
packet of size L bits to Host B.
Show Transcribed Text
5. Suppose dprop is greater than dtrans. At time t = dtrans, where is the first
bit of the packet?
The bit is just leaving Host A
O The bit is in the link and has not reached Host B
O The bit has reached Host B
Show Transcribed Text
The bit is just leaving Host A
S
6. Suppose dprop is less than dtrans. At time t = dtrans, where is the first bit
of the packet?
The bit has reached Host B
The bit is in the link and has not reached Host B
Show Transcribed Text
Ć
Show Transcribed Text
3
7. Suppose s = 2.5×108, L = 120 bits, and R = 56 kbps. What is the
distance m so that dprop equals dtrans (assuming unit is km, round up to an
integer answer)?
Transcribed Image Text:1. (a) (b) (c) Consider two hosts A and B, connected by a single link of rate R bps. Suppose that the two hosts are separated by m meters, and the propagation speed along the link is s meters/sec. Host A is to send a packet of size L bits to Host B. Show Transcribed Text 5. Suppose dprop is greater than dtrans. At time t = dtrans, where is the first bit of the packet? The bit is just leaving Host A O The bit is in the link and has not reached Host B O The bit has reached Host B Show Transcribed Text The bit is just leaving Host A S 6. Suppose dprop is less than dtrans. At time t = dtrans, where is the first bit of the packet? The bit has reached Host B The bit is in the link and has not reached Host B Show Transcribed Text Ć Show Transcribed Text 3 7. Suppose s = 2.5×108, L = 120 bits, and R = 56 kbps. What is the distance m so that dprop equals dtrans (assuming unit is km, round up to an integer answer)?
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