Cisco routers use the administrative distance value

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Cisco routers use the administrative distance value to determine which routing source to use. Each dynamic routing protocol has a unique administrative value, along with static routes and directly connected networks. Directly connected networks are preferred source, followed by static routes and then various dynamic routing protocols. Each dynamic routing protocol has a unique administrative value, along with static routes and directly connected networks. The lower the administrative value, the more preferred the route source. A directly connected network is always the preferred source, followed by static routes and then various dynamic routing protocols. Routing table entries contain a route source, a destination network, and an outgoing interface. Route sources can be either connected, local, static, or from a dynamic routing protocol. IPv4 routing tables can contain four types of routes: ultimate routes, level 1 routes, level 1 parent routes, and level 2 child routes. Because IPv6 is classless by design, all routes are effectively level 1 ultimate routes. There is no level 1 parent of level 2 child routes. Section 3.1 Terms and Commands Static routing Dynamic routing RIPv1 RIPv2 OSPF IS-IS IGRP
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EIGRP BGP Routing table Stub network Update messages Section 3.2 Terms and Commands router rip no router rip network network-address show ip protocols show ip route version 2 no version no auto-summary passive-interface passive-interface default no passive-interface ip route 0.0.0.0 0.0.0.0 default-information originate Section 3.3 Terms and Commands Classful routing Classless addressing Route source (C and L) Destination network Outgoing interface Administrative distance (AD) Metric Route timestamp Ultimate route Level 1 route Level 1 parent route Level 2 child route Network route Supernet route Default route
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  • Summer '17
  • Miss Ngcobo
  • Classless Inter-Domain Routing

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