Summary CCIE Routing and Switching v5.0 Official Cert Guide Book cover image

Summary CCIE Routing and Switching v5.0 Official Cert Guide

- Narbik Kocharians, et al
ISBN-10 0133591069 ISBN-13 9780133591064
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A snapshot of the summary - CCIE Routing and Switching v5.0 Official Cert Guide Author: Narbik Kocharians Terry Vinson ISBN: 9780133591064

  • 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

  • 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 9.0.0.0/8
    Which one is preferred? Please Explain

    A. ASN 2-3
    B. ASN 5-4-3
    A because the path is the shortest 
  • 1.2 Building BGP Neighbour Relationships

  • 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
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