tailieunhanh - The Illustrated Network- P72

The Illustrated Network- P72: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. | 679 QUESTIONS FOR READERS Figure shows some of the concepts discussed in this chapter and can be used to answer the following questions. MPLS LSP r ----------------------------------- VPLS Virtual Port vt-0 3 0 32770 vt-0 3 0 32771 FIGURE Topology for the VPLS configuration. 1. How many LSPs are used to connect the two routers at the ends of the VPLS 2. Where does the LSP connecting the site router CE0 to CE6 begin and end 3. Why is the configuration on the PE router so complex 4. What is the function of the VPLS virtual port 5. What if a third site router using the 24 address space joined the network Could the VPLS be extended to that site as well If so how CHAPTER Network Address Translation 27 What You Will Learn In this chapter you will learn how NAT originally used to address the shortage of IPv4 addresses is now used to conceal public IPv4 addresses. We ll talk about the advantages and disadvantages of using NAT for this purpose. You will learn that there are four types of NAT and find that using NAT for security is not the best use of NAT. We ll also configure the popular NATP and see how and where the IPv4 addresses on the Illustrated Network are translated. This chapter deals with a common TCP IP practice network address translation NAT . NAT is used to conceal the true public IPv4 addresses of a device by using substitute IPv4 addresses in packet headers. NAT is usually performed by customer-edge site routers or hubs and is more sophisticated today than the older methods of simply using private RFC 1918 addresses whenever one liked. Although often presented as a security feature NAT properly called IP NAT because there are many types of network addresses that can be translated was invented in RFC 1631 to address the shortage of IPv4 addresses while the world waited for IPv6. NAT is still not an official Internet standard but it is a very common practice and a feature of many routers hubs and remote access devices. When NAT was .

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