Read the summary and the most important questions on CCIE Routing and Switching v5.0 Official Cert Guide | 9780133591064 | Narbik Kocharians; Terry Vinson

• 1 Fundamentals of BGP Operations

• What are the fundamental tasks of BGP?

  Forming neighbour relationships
  Injecting routes into BGP
  Exchanging routes with other routers
  Placing routes into IP routing table

• 1.1 Foundation Topics

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• What mechanism does BGP use for the best route?

  BGP uses the BGP autonomous system path (AS_PATH) as it default metric mechanism.

• What does the abbreviation BPG PA mean?

  Path attribute

• What does the AS_PATH attribute lists?

  It lists the path, as defined by a sequence of ASN (autonomous system numbers) through which a packet must pass to pass to reach a prefix.

• Router learns two AS_PATHs with prefix 9.0.0.0/8Which one is preferred? Please ExplainA. ASN 2-3B. ASN 5-4-3

  A because the path is the shortest 

• 1.2 Building BGP Neighbour Relationships

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• What is the default behaviour of BGP if nothing is configured?

  The router reject the request

• Which is the default state of two working BGP peers?

  Established

• How is the BGP router ID (RID) determined?

  BGP router command
  Highest IP loopback at time BGP starts
  Highest IP interface at time BGP starts

• How is the destination IP address used to reach a neigbour determined?

  Neighbor command

• What is the default for BGP auto-summary?

  OFF by default in newer IOS version prior 12.3