ROUTING

COMMON

Default Administrative distance :
Connected Interface – 0
Static Route - 1
External BGP -20
Internal EIGRP -90
IGRP – 100
OSPF-110
IS-IS- 115
RIP V1, V2-120
External EIGRP-170
IBGP-200
Unknown-255
Distance vector Protocol:
It finds best path by using distance i.e Hops. Ex: RIP, IGRP
Link State Protocol:
Using 3 tables finds best path (Neighbor Table, Topology Table, and Routing Table).( OSPF,IS-IS).
Link state protocols using Area architecture.
The link state Protocol advertise its all routes to neighbor, even though the neighbors not using those routes.
Hybrid Protocol:
Mixing of Distance vector and Link state. (EIGRP).
EIGRP advertise only the best route about its neighbors, to its neighbor. So that only EIGRP is not coming under Link state routing protocol.
ROUTING Preference
1. Specific subnet Mask
2. Administrative difference
3. Metric