What is the default administrative distance of OSPF?
A.
90
B.
100
C.
110
D.
120
Explanation:
Administrative distance is the feature that routers use in order to select the best path when
there are two or more different routes to the same destination from two different routing
protocols. Administrative distance defines the reliability of a routing protocol. Each routing
protocol is prioritized in order of most to least reliable (believable) with the help of an
administrative distance value.
Default Distance Value Table
This table lists the administrative distance default values of the protocols that Cisco
supports:
Route Source Default Distance Values
Connected interface 0
Static route 1
Enhanced Interior Gateway Routing Protocol (EIGRP) summary
route
5
External Border Gateway Protocol (BGP) 20
Internal EIGRP 90
IGRP 100
OSPF 110
Intermediate System-to-Intermediate System (IS-IS) 115
Routing Information Protocol (RIP) 120
Exterior Gateway Protocol (EGP) 140
On Demand Routing (ODR) 160External EIGRP 170
Internal BGP 200
Unknown* 255