TAILIEUCHUNG - The Illustrated Network- P3

The Illustrated Network- P3:In this chapter, you will learn about the protocol stack used on the global public Internet and how these protocols have been evolving in today’s world. We’ll review some key basic defi nitions and see the network used to illustrate all of the examples in this book, as well as the packet content, the role that hosts and routers play on the network, and how graphic user and command line interfaces (GUI and CLI, respectively) both are used to interact with devices. | Contents xix Layer 2 VPNs. 671 VPLS An MPLS-Based L2VPN. 672 Router-by-RouterVPLS Configuration. 672 P Router P9 . 674 CE6 Router. 676 Does It Really Work . 677 Questions for Readers. 679 CHAPTER 27 Network Address Using NAT. 684 Advantages and Disadvantages of NAT. 684 Four Types of NAT. 685 NAT in Action. 691 Questions for Readers. 695 CHAPTER 28 Firewalls. 697 What Firewalls Do. 700 A Router Packet Filter. 700 Stateful Inspection on a Router. 701 Types of Firewalls. 705 Packet Filters. 706 Application Proxy. 706 Stateful Inspection. 706 DMZ. 708 Questions for Readers. 711 CHAPTER 29 IP IPSec in Action. 716 CE0. 716 CE6. 718 Introduction to IPSec. 719 IPSec RFCs. 719 IPSec Implementation. 719 IPSec Transport and Tunnel Mode. 721 Security Associations and More. 722 Security Policies. 722 Authentication Header. 723 Encapsulating Security Payload. 725 Internet Key Exchange. 728 Questions for Readers. 731 xx Contents Part VII Media_ CHAPTER 30 Voice over Internet VoIP in Action. 738 The Attraction of VoIP. 741 What Is Voice . 741 The Problem of Delay. 742 PacketizedVoice. 744 Protocols for VoIP. 744 RTP for Vo IP Transport. 745 Signaling. 748 the International Standard. 749 SIP the Internet Standard. 750 MGCP and Megaco . 752 Putting It All Together. 753 Questions for Readers. 755 List of Acronyms Bibliography Index 757 767 769 Foreword Network consolidation has been an industry trend since the turn of the century. Reducing capital investment by converging data voice video virtual private networks VPNs and other services onto a single shared infrastructure is financially attractive but the larger benefit is in not having to maintain and operate multiple service-specific infrastructures. Fundamental to network consolidation supporting a diverse set of services with a single infrastructure is a common encapsulating protocol that accommodates different .

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