The topics in this chapter concern the advanced configuration of BGP-4. You will need to apply your understanding of the basic concepts and configuration of BGP-4 that you gained in the last chapter because, in this chapter, the full complexity and sophistication of BGP-4 is explained. In this chapter, the true use of BGP-4 is explored—whether its use is to connect to an ISP or even to act as an ISP with several connected organizations. The chapter covers how BGP-4 can be configured to select a particular path and the design features and pitfalls of BGP. In this discussion of the advanced configuration of BGP-4, the explanation of the technology is coupled with configuration examples so that your conceptual understanding of BGP is reinforced by concrete implementation examples.
The topics in this chapter will directly reflect questions on the Routing exam. BGP-4 is a routing protocol designed for use in large networks. As a well-known attribute to the networking world, it is a mandatory topic in the Routing exam. The BSCN course devotes 11 percent of its material to implementing BGP in scalable networks. Because nearly a quarter of the BSCN course is devoted to BGP, as reflected in Chapter 8, "Connecting to Other Autonomous Systems—The Basics of BGP-4," and Chapter 9, "Implementing and Tuning BGP for Use in Large Networks," you should expect quite a few BGP questions on the test to reflect this concentration.
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