简化SDN与NFV：技术详解指南

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"SDN（Software-Defined Networking）和NFV（Network Functions Virtualization）是现代网络架构中的关键技术，它们分别通过软件控制和虚拟化的方式重新定义了网络的运作方式。《SDN和NFV简化》这本书提供了一个全面且易于理解的指南，旨在帮助读者深入理解这两种复杂的技术。该电子书采用EPUB格式，这是一种开放且广泛接受的电子书籍标准。然而，不同阅读设备和应用对EPUB的支持可能存在差异，因此建议读者根据自己的设备或应用程序设置进行个性化调整。这些设置可能包括字体、字号、单列或双列布局、横竖阅读模式，以及可点击放大图片等功能。为了获得更准确的帮助，用户可以访问设备制造商的官方网站查询具体设置方法。书中包含大量的编程代码和配置示例，为了优化这类元素的呈现，推荐在单列模式和横屏模式下阅读，并将字体大小调整至最小。为了保持代码列表的清晰展示，文本格式可能会有局限性，遇到这种情况，会看到一个“点击此处查看代码图像”的链接。点击链接，读者可以看到与印刷版一致的代码图片。返回到之前的页面，只需点击相应的链接即可。通过本书，读者不仅能够学习SDN的核心理念，即通过软件集中控制网络流量和路由，实现网络策略的灵活编排，还能理解NFV如何通过虚拟化技术分离网络功能，使网络服务可以在不依赖硬件的情况下运行。此外，作者还会探讨这两种技术的集成应用，以及它们如何推动网络运营的效率提升和成本降低。《SDN和NFV简化》是一本实用的参考书，它既适合网络专业人士，也适合希望深入了解这两项前沿技术的读者。通过深入浅出的讲解和丰富的实例，读者可以迅速掌握并应用于实际的网络设计和运维场景中。"

About the Author

Jim Doherty has more than 17 years of engineering and marketing experience across a broad range of

networking, security, and technology companies. Focusing on technology strategy, product

positioning, and marketing execution, Jim has held leadership positions for Cisco Systems, Certes

Networks, Ixia, and Ericsson Mobile. Currently, he is the SVP of Sales and Marketing for Percona.

Doherty is also the creator and co-author of the Networking Simplified series of books, which

includes Cisco Networking Simplified, Home Networking Simplified, and several other titles. He has

also written books on mobile security and other networking topics.

Jim is a former U.S. Marine Corps Sergeant and holds a Bachelor of Science degree in electrical

engineering from North Carolina State University and an MBA from Duke University. Jim lives in

Raleigh, North Carolina, with his wife and two children.

Introduction

Dear Reader,

Thank you for buying (or considering) this book. By way of background, this book is the latest in a

series of Networking Simplified books that have covered topics such as basic networking with Cisco

Networking Simplified, and other titles that have taken a “simplified” approach to Voice over IP

(VoIP), security, and home networking.

If you are not familiar with the approach of the Networking Simplified books, the idea is to explain

networking concepts and technologies to people who are not intending to become technical experts,

but want to know what underlying networking technologies are and how they work at a high level.

This includes business and marketing folks, salespeople, investors, people who work in technical

companies but in nontechnical roles, and even technical people from different vocations who want a

cursory introduction to networking.

In others words, I wanted to write a book that explains how all this stuff works, and why it matters,

without assuming people needed to configure a router or set up a wireless network, and without

assuming the readers were dummies. The aim is to not go too deep but not be too light either.

To that end, I’ve now written (with the help of many people listed in the acknowledgments) a book on

the next big wave in networking: software-defined networking (SDN) and network functions

virtualization (NFV). My approach to this book is similar to the previous books in that I start with

some foundational topics, which in this case is virtualization. In fact, the first several sections of the

book focus on this because 1) it’s really important and 2) I did not think that there was a good

resource out there that took the same simplified approach. The book then moves into SDN and NFV,

and through it all are parts about cloud networks, virtualized data centers, and network virtualization.

Whiteboards

Also throughout this book, typically at the end of chapters, are “whiteboard” diagrams. These hand-

drawn (and then digitized) whiteboards are meant to capture key aspects of the chapter topics and

present those ideas as if they were drawn on a whiteboard.

In keeping with the at-a-glance feature of the previous Networking Simplified books, the whiteboards

are meant as enhancements to the text, and it is hoped that they will help aid in your understanding of

the topics they cover.

Who Is This Book For, and What Will You Get Out of It?

This book is mostly meant for nontechnical people who want to know what SDN, NFV, virtualization,

and cloud networking are about: what they are, how they all work, and why they are important. You

won’t walk away from this book knowing how to configure an SDN controller, but you will know

what one is and what it does. If you are a technical person with no exposure to these topics, this book

can serve as a high-level introduction.

How This Book is Organized

I’ve broken the book into ten sections, each covering a central theme. This allows you to bounce

around and pick one topic at time. If this is all brand new to you, tackling the topics in order is

recommended, because they tend to build on each other.

Part 1: Virtualization 101: The Basics of Virtualization

As the name implies, Part I provides a primer on virtualization and virtual machines (VMs): what

they are, how they work, and why they were adopted so quickly.

Part 2: Virtualization 201: Virtualizing the Data Center (a.k.a. Clouds)

Once you understand what VMs are, you need to know how they work together and what happens

when you have an entire data center of them. This part focuses on the particulars of how clouds work

and how they are managed.

Part 3: Network Functions Virtualized: Why Stop With Servers?

Servers aren’t the only thing you can virtualize. In fact, many of the traditional applications such as

firewalls can be virtualized, too. NFV is a key aspect of modern networking. This part explores not

only the technology, but also the impact on how the networks work as a result.

Part 4: Modern Networking Approaches to Virtualization

Understanding how virtualization works is a great start, but unless you can connect to them over a

network, a VM is not very useful. It turns out, however, that connecting to VMs requires some changes

to networking before you can leverage their full power. This part explores some of the ways modern

networks are managed.

Part 5: Software Defined Networks: Virtualizing the Network

SDN represent a pivot point in how networks are built and who manages them. The technology is

analogous to the virtualization of data centers, and in fact, the shift to SDN is in large part an attempt

to leverage the most value out of virtualized data centers and clouds. This part covers the basics of

SDN technology and the economic impact of its adoption.

Part 6: SDN Controllers

Furthering the SDN discussion, this part goes into depth about SDN controllers. There’s a lot of

competition among many companies to be among the leaders in this technology, and given the

economic benefits of being among the leaders, the stakes are high. In addition to looking at specific

controllers, this part also looks at the economics of the technology.

Part 7: Virtualized Networks: Connecting It All Together

With an understanding of the pieces, this part puts virtualization, SDN, and NFV together. More than

just how it works, the chapters here explore building and managing virtualized networks.

Part 8: Security: The Security Thing

Security is an ever-present part of networking these days, and in virtualized networks, where you

don’t always know where your data assets are, security is always an interesting topic. The chapters in

this part deal with the unique security aspects of virtualization and virtualized networks.

剩余296页未读，继续阅读

Athan

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