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Сети (Routing Table: A Closer Look (Parent and Child Routes (Level 1 Route…

- - - - Static Routes
      - Dynamic routing protocols
      - Directly connected networks
  - - - Can functions as:
        
        Network Route
        It's a network address with a mask equal to the classful mask.
        A network route can also be a parent route.
        
        Supernet Route
        It's a network address with a mask less than the classful mask.
        
        Default Route
        It's a static route with the address 0.0.0.0/0
      - A level 1 parent route is the classful network address of the subnet route. This is the case even if a classless routing protocol is the source of the subnet route.
      - If it has a Child Routes than it can't be as Ultimate Route
      - If there is only a single level 2 child route and that route is removed, the level 1 parent route is automatically deleted.
      - A parent route is created whenever a route with a mask greater than the classful mask is entered into the routing table
      - Can be defined as Ultimate Route
    - - If the child routes have variable-length subnet masks (VLSM), the subnet mask will be excluded from the parent route and included with the individual child routes.
      - It's Ultimate Route
  - - - Step 1a.
        If the best match is a level 1 ultimate route, use it to forward the packet
      - Step 2.
        Child routes are examined for a best match
        
        Step 2a.
        If there is a match with a level 2 child route, that subnet is used to forward the packet
        
        Step 3.
        Is the router implementing classful or classless routing behavior
        
        Step 3a.
        If classful routing behavior is in effect, terminate the lookup process and drop the packet
        
        Step 3b.
        Classless routing behavior: Search level 1 routes including the default route
        
        Step 4.
        Match with supernet or default. Use it to forward packet. Supernets are
        checked first, then default if necessary
        
        Step 5.
        No match. No default. Drop the packet.