CCNP Routing & Switching ROUTE 300-101 Chapters 1 & 2 Notes Part I

CCNP Routing & Switching ROUTE 300-101 Chapters 1 & 2 Notes:

  • There is a natural need for routing protocols
    • The use of layer 3 devices
    • Scalability
      • The most common routing protocols used in an enterprise/campus networks are versions or RIP, EIGPR, OSPF
      •  Most common routing protocol used for external/untrust (Internet) networks is BGP
    • There are 3 Routing Protocol Categories
      • Distance Vector (Sends full copy of the routing table at certain interval)
        • Distance-Vectore routing protocols use one of the following approaches to prevent routing loops:
          • Split Horizon – This is when an interface is prevented to advertise a route which it already learned on that interface. 
          • Poison ReverseThis is when an interface receives a route advertisement but then re-advertises the same route out with a metric considered infinite.

  • Examples of Distance Vector Protocols:
    • RIP
    • EIGRP (Is considered an advanced version or distance vector protocols)
      • Link-State (Sends out full routing tables at first by sending out LSA’s. LSA’s are used to then build a topology map of the network)
        • Examples of Link-State Protocols:
          • OSPF
          • IS-IS
      • Path-Vector
        • BGP is the only path-vector protocol used today


  • Traffic Flow is really important, there are 4 types of traffic is sent from source to destination:
    • As Unicast (when a source device sends traffic to a specific destination)
    • As Multicast (when a source device sends traffic to multiple specific devices)
    • As Broadcast (when a source device sends traffic to a whole broadcast domain. THIS IS USED IN IPv4 NOT IPv6.)
    • As Anycast (used in situations where traffic is sent to devices which have the same IP address, based on routing the device closest to the source receives the packet. THIS IS A IPv6 FUNCTION.) 


  • Network Architecture Types:
    • Point-to-Point
    • Broadcast
    • NBMA (non-broadcast multiaccess)


In summary, routing is a fundamental part in today’s networks. Main purpose for routing is to deliver packets from source to destination. In an effort to route traffic in a fast and efficient way there are multiple protocols available which one can choose from. When troubleshooting or designing a network its also crucial to understand the architecture of the network and the various drawbacks each has. In the end, there are different ways to deliver traffic from source to destination, understanding each traffic type aids in building a robust network.


Pages 1-20 (2 hours)

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