BORDER GATEWAY PROTOCOL VERSION 4 (BGP4)

35. Understand the basic features and uses of the BGP protocol as an EGP.

36. Be knowledgeable of the general principles that BGP uses to route between autonomous systems.

37. Be aware that the BGP route selection process considers only synchronized routes without AS loops and a valid next -hop address.

38. You should be familiar with the sequence of characteristics (attributes) that BGP uses for path selection, as follows :

    1. The highest weight that is local on the router

    2. The highest local preference throughout the AS

    3. The route originated by the router

    4. The shortest AS_PATH attribute

    5. The lowest origin code

    6. The lowest MED from another AS

    7. The EBGP path over an IBGP path

    8. The path through the closest IGP peer

    9. The oldest route for EBGP paths

    10. The path with the lowest neighbor BGP router ID

    11. The path with the lowest neighbor IP address

39. Be aware of IBGP scalability issues and how route reflectors and prefix lists provide solutions.

40. Understand the common methods for multihoming links to the Internet through ISPs.

41. Have a grasp of redistribution techniques between BGP and an IGP.