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2. Packet transmission. a. Consider a packet of length L that begins at end system A and travels over 2 links to a destination end system B. These two links are connected by one packet switch. Let d₁, S₁, and R₁ denote the length, propagation speed and transmission rate of link I, for i in {1, 2}. The packet switch delays each packet by dproc b. There is a queuing delay of 100 msec at the switch (but no queuing delay at A). The packet is 1500 bits in length, the propagation speed on all links is 2.5 x 108 m/sec, the transmission rate on both links is 1 Mbps, and the packet switch processing delay is 3 msec. The length of the first link is 4000 km and the second link is 1000 km. What is the end-to-end delay from A to B? c. The switch fails and is replaced. This changes the following information for the switch only. The packet switch processing delay is reduced from 3 msec to 2 msec, the queuing delay is reduced from 100 msec to 40 msec but the second transmission link increases to 8,500 km from 1000 km. What is the new end-to-end delay from A to B?

2. Packet transmission. a. Consider a packet of length L that begins at end system A and travels over 2 links to a destination end system B. These two links are connected by one packet switch. Let d₁, S₁, and R₁ denote the length, propagation speed and transmission rate of link I, for i in {1, 2}. The packet switch delays each packet by dproc b. There is a queuing delay of 100 msec at the switch (but no queuing delay at A). The packet is 1500 bits in length, the propagation speed on all links is 2.5 x 108 m/sec, the transmission rate on both links is 1 Mbps, and the packet switch processing delay is 3 msec. The length of the first link is 4000 km and the second link is 1000 km. What is the end-to-end delay from A to B? c. The switch fails and is replaced. This changes the following information for the switch only. The packet switch processing delay is reduced from 3 msec to 2 msec, the queuing delay is reduced from 100 msec to 40 msec but the second transmission link increases to 8,500 km from 1000 km. What is the new end-to-end delay from A to B?

Computer Networking: A Top-Down Approach (7th Edition)
Computer Networking: A Top-Down Approach (7th Edition)
7th Edition
ISBN:9780133594140
Author:James Kurose, Keith Ross
Publisher:James Kurose, Keith Ross
Chapter1: Computer Networks And The Internet
Section: Chapter Questions
Problem R1RQ: What is the difference between a host and an end system? List several different types of end...
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2. Packet transmission. a. Consider a packet of length L that begins at end system A and travels over 2 links to a destination end system B. These two links are connected by one packet switch. Let d₁, S₁, and R₁ denote the length, propagation speed and transmission rate of link I, for i in {1, 2}. The packet switch delays each packet by dproc b. There is a queuing delay of 100 msec at the switch (but no queuing delay at A). The packet is 1500 bits in length, the propagation speed on all links is 2.5 x 108 m/sec, the transmission rate on both links is 1 Mbps, and the packet switch processing delay is 3 msec. The length of the first link is 4000 km and the second link is 1000 km. What is the end-to-end delay from A to B? c. The switch fails and is replaced. This changes the following information for the switch only. The packet switch processing delay is reduced from 3 msec to 2 msec, the queuing delay is reduced from 100 msec to 40 msec but the second transmission link increases to 8,500 km from 1000 km. What is the new end-to-end delay from A to B?
Transcribed Image Text:2. Packet transmission. a. Consider a packet of length L that begins at end system A and travels over 2 links to a destination end system B. These two links are connected by one packet switch. Let d₁, S₁, and R₁ denote the length, propagation speed and transmission rate of link I, for i in {1, 2}. The packet switch delays each packet by dproc b. There is a queuing delay of 100 msec at the switch (but no queuing delay at A). The packet is 1500 bits in length, the propagation speed on all links is 2.5 x 108 m/sec, the transmission rate on both links is 1 Mbps, and the packet switch processing delay is 3 msec. The length of the first link is 4000 km and the second link is 1000 km. What is the end-to-end delay from A to B? c. The switch fails and is replaced. This changes the following information for the switch only. The packet switch processing delay is reduced from 3 msec to 2 msec, the queuing delay is reduced from 100 msec to 40 msec but the second transmission link increases to 8,500 km from 1000 km. What is the new end-to-end delay from A to B?
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