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计算机网络-自顶向下方法第六版习题答案(英文)

计算机网络

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计算机网络-自顶向下方法第六版习题答案本书是当前世界上最为流行的计算机网络教科书之一，采用了作者独创的自顶向下的方法来讲授计算机网络的原理及其协议，即从应用层协议开始沿协议栈向下讲解，强调应用层范例和应用编程接口，使读者尽快进入每天使用的应用程序环境之中进行学习和“创造”。本书的讲解以因特网为例，学以致用；注重教学法，深入浅出地重点讲解计算机网络的基本原理

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Computer Networking: A Top-Down Approach,

Edition

Solutions to Review Questions and Problems

Version Date: May 2012

This document contains the solutions to review questions and

problems for the 5th edition of Computer Networking: A Top-

Down Approach by Jim Kurose and Keith Ross. These solutions

are being made available to instructors ONLY. Please do NOT

copy or distribute this document to others (even other instructors).

Please do not post any solutions on a publicly-available Web site.

We’ll be happy to provide a copy (up-to-date) of this solution

manual ourselves to anyone who asks.

Acknowledgments: Over the years, several students and colleagues

have helped us prepare this solutions manual. Special thanks goes

to HongGang Zhang, Rakesh Kumar, Prithula Dhungel, and Vijay

Annapureddy. Also thanks to all the readers who have made

suggestions and corrected errors.

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, PDAs,

Internet-connected game consoles, etc.

2. From Wikipedia: Diplomatic protocol is commonly described as

a set of international courtesy rules. These well-established and

time-honored rules have made it easier for nations and people to

live and work together. Part of protocol has always been the

acknowledgment of the hierarchical standing of all present.

Protocol rules are based on the principles of civility.

3. Standards are important for protocols so that people can create

networking systems and products that interoperate.

4. 1. Dial- up modem over telephone line: home; 2. DSL over

telephone line: home or small office; 3. Cable to HFC: home; 4.

100 Mbps switched Ethernet: enterprise; 5. Wifi (802.11): home

and enterprise: 6. 3G and 4G: wide-area wireless.

5. HFC bandwidth is shared among the users. On the downstream

channel, all packets emanate from a single source, namely, the

head end. Thus, there are no collisions in the downstream

channel.

6. In most American cities, the current possibilities include: dial-

up; DSL; cable modem; fiber-to-the-home.

7. Ethernet LANs have transmission rates of 10 Mbps, 100 Mbps, 1

Gbps and 10 Gbps.

8. Today, Ethernet most commonly runs over twisted-pair copper

wire. It also can run over fibers optic links.

9. Dial up modems: up to 56 Kbps, bandwidth is dedicated; ADSL:

up to 24 Mbps

downstream and 2.5 Mbps upstream, bandwidth is dedicated;

HFC, rates up to 42.8 Mbps and upstream rates of up to 30.7

Mbps, bandwidth is shared. FTTH: 2-10Mbps upload; 10-20

Mbps download; bandwidth is not shared.

10. There are two popular wireless Internet access technologies

today:

a) Wifi (802.11) In a wireless LAN, wireless users transmit/receive

packets to/from a n base station (i.e., wireless access point)

within a radius of few tens of meters. The base station is

typically connected to the wired Internet and thus serves to

connect wireless users to the wired network.

b) 3G and 4G wide-area wireless access networks. In these

systems, packets are transmitted over the same wireless

infrastructure used for cellular telephony, with the base station

thus being managed by a telecommunications provider. This

provides wireless access to users within a radius of tens of

kilometers of the base station.

11. At time t0 the sending host begins to transmit. At time t1 =

L/R1, the sending host completes transmission and the entire

packet is received at the router (no propagation delay). Because

the router has the entire packet at time t1, it can begin to

transmit the packet to the receiving host at time t1. At time t2 =

t1 + L/R2, the router completes transmission and the entire

packet is received at the receiving host (again, no propagation

delay). Thus, the end-to-end delay is L/R1 + L/R2.

12. A circuit-switched network can guarantee a certain amount of

end-to-end bandwidth for the duration of a call. Most packet-

switched networks today (including the Internet) cannot make

any end-to-end guarantees for bandwidth. FDM requires

sophisticated analog hardware to shift signal into appropriate

frequency bands.

13. a) 2 users can be supported because each user requires half of

the link bandwidth.

b) Since each user requires 1Mbps when transmitting, if two or

fewer users transmit simultaneously, a maximum of 2Mbps

will be required. Since the available

bandwidth of the shared link is 2Mbps, there will be no

queuing delay before the link. Whereas, if three users

transmit simultaneously, the bandwidth required will be

3Mbps which is more than the available bandwidth of the

shared link. In this case, there will be queuing delay before

the link.

Probabil

ity

that a given user is

transmitting =

0.2

)

Probabil

ity

that all three users are

transmitting

simultaneousl

y =



3



 p 1  p

 





剩余63页未读，继续阅读

Lion_Archer

2019-08-14

这是第五版的，不是第六版。。。

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