"计算机网络自顶向下方法第四版答案英文版"

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The fourth edition of Computer Networking: A Top-Down Approach Featuring the Internet provides comprehensive solutions to review questions and problems for instructors. These solutions, written in English, are designed to assist instructors in teaching the concepts covered in the textbook. The document, dated October 29, 2007, emphasizes the importance of not distributing or copying the solutions to others. It is a valuable resource for instructors looking to enhance their teaching of computer networking principles using a top-down approach. The solutions cover a range of topics related to computer networking, offering clear explanations and examples to aid in understanding complex concepts. Overall, this document serves as a helpful tool for instructors seeking to provide students with a solid foundation in computer networking theory and practice.

Problem 18

a) 40,000 bits

b) 40,000 bits

c) The bandwidth-delay product of a link is the maximum number of bits that can be in

the link

d) 1 bit is 250 meters long, which is longer than a football field

e) s/R

Problem 19

25 bps

Problem 20

a) 40,000,000 bits

b) 400,000 bits

c) .25 meters

Problem 21

a) t

trans

+ t

prop

= 400 msec + 40 msec = 440 msec

b) 10 * (t

trans

+ 2 t

prop

) = 10*(40 msec + 80 msec) = 1.2 sec

Problem 22

a) 150 msec

b) 1,500,000 bits

c) 600,000,000 bits

Problem 23

Let’s suppose the passenger and his/her bags correspond to the data unit arriving to the

top of the protocol stack. When the passenger checks in, his/her bags are checked, and a

tag is attached to the bags and ticket. This is additional information added in the

Baggage layer if Figure 1.20 that allows the Baggage layer to implement the service or

separating the passengers and baggage on the sending side, and then reuniting them

(hopefully!) on the destination side. When a passenger then passes through security, and

additional stamp is often added to his/her ticket, indicating that the passenger has passed

through a security check. This information is used to ensure (e.g., by later checks for the

security information) secure transfer of people.

Problem 24

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