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Computer Networks,Fourth Edition 计算机网络第四版

计算机网络

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Computer Networks,Fourth Edition 计算机网络第四版 Computer Networks,Fourth Edition 计算机网络第四版

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DNS in Action

A detailed and practical guide to DNS

implementation, configuration, and administration

Libor Dostálek

Alena Kabelová

BIRMINGHAM - MUMBAI

DNS in Action

A detailed and practical guide to DNS implementation, configuration,

and administration

or transmitted in any form or by any means, without the prior written permission of the

publisher, except in the case of brief quotations embedded in critical articles or reviews.

Every effort has been made in the preparation of this book to ensure the accuracy of the

information presented. However, the information contained in this book is sold without

warranty, either express or implied. Neither the authors, Packt Publishing, nor its dealers

or distributors will be held liable for any damages caused or alleged to be caused directly

or indirectly by this book.

Packt Publishing has endeavored to provide trademark information about all the

companies and products mentioned in this book by the appropriate use of capitals.

However, Packt Publishing cannot guarantee the accuracy of this information.

First published: March 2006

Production Reference: 1240206

Published by Packt Publishing Ltd.

32 Lincoln Road

Olton

Birmingham, B27 6PA, UK.

ISBN 1-904811-78-7

www.packtpub.com

Cover Design by www.visionwt.com

This is an authorized and updated translation from the Czech language.

Credits

Authors

Libor Dostálek

Alena Kabelová

Technical Editors

Darshan Parekh

Abhishek Shirodkar

Editorial Manager

Dipali Chittar

Development Editor

Louay Fatoohi

Indexer

Abhishek Shirodkar

Proofreader

Chris Smith

Production Coordinator

Manjiri Nadkarni

Cover Designer

Helen Wood

About the Authors

Libor Dostálek was born in 1957 in Prague, Europe. He graduated in mathematics at the

Charles University in Prague. For the last 20 years he has been involved in ICT architecture

and security. His experiences as the IT architect and the hostmaster of one of the first

European Internet Service Providers have been used while writing this publication.

Later he became an IT architect of one of the first home banking applications fully based on

the PKI architecture, and also an IT architect of one of the first GSM banking applications

(mobile banking). As a head consultant, he designed the architecture of several European

public certification service providers (certification authorities) and also many e-commerce

and e-banking applications.

The public knows him either as an author of many publications about TCP/IP and security

or as a teacher. He has taught at various schools as well as held various commercial

courses. At present, he lectures on Cryptology at the Charles University in Prague.

He is currently an employee of the Siemens.

Alena Kabelová was born in 1964 in Budweis, Europe. She graduated in ICT at the

Economical University in Prague. She worked together with Libor Dostálek as a

hostmaster. She is mostly involved in software development and teaching. At present, she

works as a senior project manager at the PVT and focuses mainly on electronic banking.

Her experiences as the hostmaster of an important European ISP are applied in this publication.

剩余194页未读，继续阅读

swu347415729

2012-11-20

下来看看据说不是Computer Networks 果然不是

分析countries = hist_worldcup[['Winner','Second','Third','Fourth']].apply(pd.value_counts).reset_index().fillna(0) countries['SemiFinal'] = countries['Winner'] + countries['Second']+countries['Third']+countries['Fourth'] countries['Final'] = countries['Winner']+countries['Second']

这是一个数据处理的过程，首先从hist_worldcup数据集中选取了['Winner','Second','Third','Fourth']这四列数据，并使用apply方法结合pd.value_counts方法对每个国家在这四个位置上获得的次数进行统计，并将结果存储...

sorted函数按第四个字母排序

可以使用`key`参数来指定排序的规则。...在上面的代码中，`sort_by_fourth_letter`函数返回单词的第四个字母，然后在调用`sorted`函数时，将其作为`key`参数传递。这样就可以实现按照第四个字母进行排序的功能。

Write me a java project named pontoon game, which needs to meet the following requirements:Pontoon is a card game played with three decks of playing cards (i.e. cards of 2-10, Jack, Queen, King, and Ace from the four suits of Hearts, Diamonds, Spades, and Clubs). There are two players: the user of the computer, and the computer itself. The object of the game is to beat the other player by either getting as close to a score of 21 as possible (without exceeding 21) or by having 5 cards and a score of 21 or less. Each card has a value: numeric cards have their numeric value, 'face' cards have value 10, and aces have value 11. The game is played as follows, Firstly the user is told about the game and invited to play. If they opt to play then four cards are dealt. The first card goes to the user, the second to the computer, the third to the user, and the fourth to the computer. The computer's card remains hidden, all others are shown. The user can then indicate they wish to have an additional card ("hit"). If they are this card is also displayed. Additional cards may be taken until either the user's score exceeds 21 (they "bust"), or they choose not to take another card ("sit"/"stand"). Once the user has finished taking cards the computer will take cards. The computer will always take a card if their total is less than 16 (and the user's score doesn't exceed 21).

Sure, here is an implementation of the Pontoon game in Java: ``` import java.util.ArrayList; import java.util.Collections; import java.util.List; import java.util.Scanner;...public class PontoonGame { ...

x = ['0.212', '0.321', '0.124', '0.2357','0.5684','0.234']，利用Python选取x中的第一个和第四个

元素，应该怎么做？您可以使用以下代码来选取x中的第一个和第四个元素： x = ['0.212', '0.321', '0.124', '0.2357', '0.5684', '0.234'...这会将x中的第一个元素赋给first_element，第四个元素赋给fourth_element。

1. 第一个版本 a.可设置网格大小。 b.模拟运行直到用户触发停止信号。 c.需要实现以下功能 1 . run():执行一次生成 2Display():显示当前状态 3Init():初始化网格 2. 第二版(如果你觉得舒服，可以作为你的第一步) a.定义类Automaton来模拟仿真。 b.可以暂停和恢复模拟。 3.第三个版本 a.定义Cell类每个细胞负责计算下一代的步骤。 2单元格显示其状态 4. 第四版 a.可以保存和加载当前生成的文件。 b.细胞可以检测到一些模式并通知用户。 5. 第五版 a.用户可以在运行时更改单元格的状态。 b.模拟可以被还原(还原到前一代的状态) 6. 第六版+ + a.任何你想尝试的更新。以上翻译结果来自有道神经网络翻译（YNMT）· 通用场景

4. The fourth version a. The current generation's file can be saved and loaded. b. Cells can detect some patterns and notify the user. 5. The fifth version a. Users can change the cell's state during...

16进制8位未知数，然后二进制输出他倒数第四位数，用c

可以使用C语言的位运算符将16进制数转换成二进制，并输出倒数第四位的二进制数。具体代码如下： ```c #include int main() { // 输入16进制数 int hex; printf("请输入16进制数："); scanf("%x", &hex); //...

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分析countries = hist_worldcup[['Winner','Second','Third','Fourth']].apply(pd.value_counts).reset_index().fillna(0) countries['SemiFinal'] = countries['Winner'] + countries['Second']+countries['Third']+countries['Fourth'] countries['Final'] = countries['Winner']+countries['Second']

sorted函数按第四个字母排序

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x = ['0.212', '0.321', '0.124', '0.2357','0.5684','0.234']，利用Python选取x中的第一个和第四个

16进制8位未知数，然后二进制输出他倒数第四位数，用c

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计算机网络第四版 Computer+Networks,Fourth Edition