CCNA 2 - Capitulo 14.1

CCNA 2 - Capitulo 14.1

1. ROUTING CONCEPTS

2. PATCH DETERMINATION

   • TWO FUNCTIONS OF ROUTER
     • 1.BEFORE A ROUTER FORWARDS A PACKET , IT HAS TO DETERMINE THE BEST PATH
     • 2.THEN ,FORWARD PACKET THEIR DESTINATION
   • EACH NETWORK THE ROUTER CONNECTS TO TYPICALLY REQUIRES A SEPARETE INTERFACE
   • BEST PATH EQUALS LONGEST MATC
     • THE BEST PATH IN THE ROUTING TABLE IS KNOW AS THE LONGEST MATCH
       • IPV4 ADDRESS
         • 1. 170.170.170.20/32
           • LONGEST MATCH
         • 1.1 170.170.170.20/29
         • 2.1 0.0.0.0/0
         • 2.1 170.170.170.20/32
           • LONGEST MATCH
       • IPV6 ADDRESS
         • 1.2 2001:SB8:C0 :000::/40
         • 1.1 2001:SB8:C000::/48
           • LONGEST MATCH
     • ROUTING TABLE CONSIST
       • PREFIX (NETWORK ADDRESS )
         • 172.16.30.0
       • PREFIX LENGHT
         • NETWORK PORTION ( DETERMINED BY NETMASK)
         • 255.255.255.0/24
     • 1 . FIRST OCCURS A MATCH THE DESTINATION IP BELONGS TO THE ROUTE’S NETWORK
       • A MINUMUM O FAR-LEFT MATCH BETWEEN IP OF THE PACKET AND THE ROUTE IN ROUTING TABLE
     • 2 . AFTER DETERMINE WHATS IS LONGEST PREFIX
   • BUILD THE ROUTING TABLE
     • DIFFERENT WAYS A ROUTER LEARNS ROUTES
       • DIRECTLY CONNECTED NETWORKS
         • IS ADDED TO ROUTING TABLE WHEN
           • INTERFACE IS CONFIGURED WITH AN IP AND SUBNET
           • AND ACTIVE
       • REMOTE NETWORKS
         • ARE NOT DIRECTLY CONNECTED TO THE ROUTER
         • ROUTERS LEARN ABOUT TWO WAYS
           • STATIC ROUTES
             • MANUALLY CONFIGURED
           • DYNAMIC ROUTING PROTOCOLS
             • ADDED ROUTING TABLE WHEN
               • ROUTIN PROTOCOLS DYNAMICALLY LEARN ABOUT
                 • REMOTE NETWORKS
                 • OSPF
                 • BGP
       • DEFAULT ROUTE (GATEWAY LAST RESORT )
         • USED WHEN ROUTING TABLE DOES NOT CONTAIN SPECIFIC ROUTE THE DESTINATION
         • HOW CAN THEY BE CREATED?
           • STATIC
           • DYNAMIC ROUTING
         • IPV4
           • 0.0.0.0/0
         • IPV6
           • ::/0