TAILIEUCHUNG - The Illustrated Network- P47

The Illustrated Network- P47: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. | 429 QUESTIONS FOR READERS Figure shows some of the concepts discussed in this chapter and can be used to help you answer the following questions. Uninterested Interested Uninterested Interested Interested Interested Host Host Host Host Host Host Group A Group B Group B Group B FIGURE A group of routers running PIM sparse mode with sources and receivers. 1. Generally it is a good idea for RPs to be centrally located on the router network. Why does this make sense 2. In Figure does the rightmost host which is interested in Group B content have to get it initially from the RP when the source is closer 3. Would the RP be required if the routers were running PIM dense mode 4. Will the leftmost router with the uninterested host constantly stream multicast traffic onto the LAN anyway 5. Is the uninterested host on the LAN in the middle able to listen in on Group A and Group B traffic without using IGMP to join the groups CHAPTER MPLS and IP Switching 17 What You Will Learn In this chapter you will learn how the desire for convergence has led to the development of various IP switching techniques. We ll also compare and contrast frame relay and ATM switched networks to illustrate the concepts behind IP switching. You will learn how MPLS is used to create LSPs to switch instead of route IP packet through a routing domain. We ll see how MPLS can form the basis for a type of VPN service offering. One of the reasons TCP IP and the Internet have grown so popular is that this architecture is the promising way to create a type of universal network well suited for and equally at home with voice video and data. The Internet started as a network exclusively for data delivery but has proved to be remarkably adaptable for different classes of traffic. Some say that more than half of all telephone calls are currently carried for part of their journey over the Internet and this percentage will only go higher in the future. Why not watch an entire movie or TV show over .

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