Routing Protocols

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  • The routers in an internet are responsible for receiving and forwarding IP datagrams through the interconnected set of sub-networks from source to destination.
  • Routing protocols essential to operation of an internet.
  • Router must have idea of topology and condition of internet.
  • Routing protocols provide this information.
  • Routing algorithm is used to make a routing decision for a particular datagram, based on current routing information.
  • Decisions based on some least cost criterion.

Routing Table

  • One required for each router
  • Entry for each network
  1. Not for each destination
  2. Routing only needs network portion
  3. Once datagram reaches router attached to destination network, that router can deliver to host.


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