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The fourth edition of "Computer Networking: A Top-Down Approach Featuring the Internet" by Jim Kurose and Keith Ross provides comprehensive answers to review questions and problems related to computer networking. This document, last updated on October 29, 2007, contains detailed solutions for instructors to use in their teaching of networking concepts. The solutions presented in this document cover a wide range of topics in computer networking, including but not limited to, network protocols, network architecture, internet protocols, wireless networks, and network security. The answers are structured to follow the top-down approach advocated in the textbook, allowing instructors to guide students from high-level concepts down to the underlying technical details of networking. Instructors are advised not to distribute or copy this document to others, as it is intended for their use only. Posting or sharing these solutions without permission is strictly prohibited. By utilizing the answers provided in this document, instructors can enhance their teaching methods and ensure that students have a solid understanding of the complex field of computer networking. Overall, the solutions in this document serve as a valuable resource for instructors looking to deepen their students' knowledge of computer networking and prepare them for the challenges of the ever-evolving digital landscape. With a focus on practical applications and real-world scenarios, the answers presented here help bridge the gap between theoretical concepts and hands-on experience in networking.

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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

a) Time to send message from source host to first packet switch =

. With store-and-forward switching, the total time to move

message from source host to destination host =

b) Time to send 1

packet from source host to first packet switch = .

. Time at which 2

packet is received at the first switch =

time at which 1

packet is received at the second switch =

c) Time at which 1

packet is received at the destination host = .

. After this, every 1msec one packet will be received;

thus time at which last (5000

) packet is received =

. It can be seen that delay in using message

segmentation is significantly less (almost 1/3

d) Drawbacks:

i. Packets have to be put in sequence at the destination.

ii. Message segmentation results in many smaller packets. Since

header size is usually the same for all packets regardless of their

size, with message segmentation the total amount of header bytes

is more.

Problem 25

Java Applet

Problem 26

Time at which the 1

packet is received at the destination = sec. After this, one

packet is received at destination every sec. Thus delay in sending the whole file =

To calculate the value of S which leads to the minimum delay,

Chapter 2 Review Questions

1. The Web: HTTP; file transfer: FTP; remote login: Telnet; Network News: NNTP;

e-mail: SMTP.

2. Network architecture refers to the organization of the communication process into

layers (e.g., the five-layer Internet architecture). Application architecture, on the

other hand, is designed by an application developer and dictates the broad

structure of the application (e.g., client-server or P2P)

3. The process which initiates the communication is the client; the process that waits

to be contacted is the server.

4. No. As stated in the text, all communication sessions have a client side and a

server side. In a P2P file-sharing application, the peer that is receiving a file is

typically the client and the peer that is sending the file is typically the server.

5. The IP address of the destination host and the port number of the destination

socket.

6. You would use UDP. With UDP, the transaction can be completed in one

roundtrip time (RTT) - the client sends the transaction request into a UDP socket,

and the server sends the reply back to the client's UDP socket. With TCP, a

minimum of two RTTs are needed - one to set-up the TCP connection, and

another for the client to send the request, and for the server to send back the reply.

7. There are no good examples of an application that requires no data loss and

timing. If you know of one, send an e-mail to the authors.

8. a) Reliable data transfer

TCP provides a reliable byte-stream between client and server but UDP does

not.

b) A guarantee that a certain value for throughput will be maintained

Neither

c) A guarantee that data will be delivered within a specified amount of time

Neither

d) Security

Neither

9. SSL operates at the application layer. The SSL socket takes unencrypted data from

the application layer, encrypts it and then passes it to the TCP socket. If the

application developer wants TCP to be enhanced with SSL, she has to include the

SSL code in the application.

10. A protocol uses handshaking if the two communicating entities first exchange

control packets before sending data to each other. SMTP uses handshaking at the

application layer whereas HTTP does not.

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计算机网络自顶向下方法第四版答案_中文版

计算机网络_自顶向下方法_第四版_课后习题答案

Chapter 1 Review Questions 1. There is no difference. Throughout this text, the words “host” and “end system” are used interchangeably. End systems include PCs, workstations, Web servers, mail servers, Internet-connected PDAs, WebTVs, etc. 2. Suppose Alice, an ambassador of country A wants to invite Bob, an ambassador of country B, over for dinner. Alice doesn’t simply just call Bob on the phone and say, “come to our dinner table now”. Instead, she calls Bob and suggests a date and time. Bob may respond by saying he’s not available that particular date, but he is available another date. Alice and Bob continue to send “messages” back and forth until they agree on a date and time. Bob then shows up at the embassy on the agreed date, hopefully not more than 15 minutes before or after the agreed time. Diplomatic protocols also allow for either Alice or Bob to politely cancel the engagement if they have reasonable excuses. 3. A networking program usually has two programs, each running on a different host, communicating with each other. The program that initiates the communication is the client. Typically, the client program requests and receives services from the server program.

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