What is the reason for this issue?

Refer to the exhibit.

An engineer is trying to redistribute OSPF to BGP, but not all of the routes are redistributed.

What is the reason for this issue?
A . By default, only internal routes and external type 1 routes are redistributed into BGP
B . Only classful networks are redistributed from OSPF to BGP
C . BGP convergence is slow, so the route will eventually be present in the BGP table
D . By default, only internal OSPF routes are redistributed into BGP

View Answer

Answer: D

Explanation:

If you configure the redistribution of OSPF into BGP without keywords, only OSPF intra-area and inter-area routes are redistributed into BGP, by default.

You can redistribute both internal and external (type-1 & type-2) OSPF routes via this command:

DRouter(config-router)#redistribute ospf 1 match internal external 1 external 2‖

Reference: https://www.cisco.com/c/en/us/support/docs/ip/border-gateway-protocol-bgp/5242-bgp-ospf-redis.html