A. When an OSPF adjacency is established.
OSPF will advertise connected networks to its neighbors once an OSPF adjacency is established on an active interface. This includes networks associated with interfaces that are participating in OSPF.
B. When an interface has the OSPF passive option enabled.
When the passive interface option is enabled for an interface, OSPF will advertise the connected network without forming an adjacency on that interface. This is useful for advertising networks such as LANs while preventing OSPF hello packets and adjacencies on that interface.
Why the other options are incorrect:
C. When a static route to the 224.0.0.6 address is created.
224.0.0.6 is a multicast address used by the OSPF Designated Router (DR) to send link-state updates to the Backup Designated Router (BDR). Static routes to this address do not influence OSPF's advertisement of connected networks.
D. When a static route to the 224.0.0.5 address is created.
224.0.0.5 is a multicast address used by OSPF routers to send hello packets to all OSPF routers on a segment. Static routes to this address do not cause OSPF to advertise connected networks.
B not correct. When an interface has the OSPF passive option enabled: Enabling the OSPF passive option on an interface does not directly cause the router to advertise its connected networks. The OSPF passive interface option is used to suppress OSPF hello packets on an interface, which means the router will not form OSPF adjacencies on that particular interface. This option is not typically used for actively advertising connected networks.
Correcting my self. AB is correct.
passive—Advertises the direct interface addresses on an interface without actually running OSPF on that interface
https://www.juniper.net/documentation/en_US/junos/topics/topic-map/ospf-passive-traffic-engineering.html
A passive interface is one for which the address information is advertised as an internal route in OSPF, but on which the protocol does not run.
Never heard of adding static routes to distribute networks in OSPF.
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