CCNA 3.5: Compare and contrast static routing and dynamic routing


Dynamic routing protocols automatically detect and adapt to network changes whereas Static routing requires manual intervention to adjust to network changes.  That automation comes at the cost of bandwidth, CPUs and buffer space.


Study Notes:

  • Configuration
    • Static routes - manual configuration for every single route. Gets more difficult to manage as the network gets bigger.
    • Dynamic routes - manual configuration for routes this router know about, dynamic updates for all other routes
  • CPU
    • Static routes - use less cpu cycles
    • Dynamic routes - cpu cycles required for analyzing and updating routes
  • Redistribution
    • Static routes - can be redistributed into dynamic routes
    • Dynamic routes - cannot be redistributed into static routes
  • Administrative Distance
    • Static routes - default admin distance of 1
    • Dynamic routes - higher than 1 and dependent on the protocol
  • Types
    • Static routes - directly connected, fully specified, floating static
    • Dynamic routes - RIP, EIGRP, OSPF, BGP
  • Prerequisites
    • Static routes - next hop must be reachable to appear in routing table
    • Dynamic routes -
  • Security
    • Static routes - very secure since no advertisements are sent




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