Must have – The Administrative Distance

A Must have …. When a router learn the a network from different sources, it use the administrative distance to build the routing table. Low is best. Source Administrative Distance Connected interface 0 Static route 1 EIGRP summary route 5 External BGP 20 Internal EIGRP 90 IGRP 100 OSPF 110 IS-IS 115 RIP 120 Exterior …