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)
160
External EIGRP
170
Internal BGP
200
Unknown*
255