Which two OSPF header fields must match to form an adjacency over a broadcast connection? (Choose two.)
Which two OSPF header fields must match to form an adjacency over a broadcast connection? (Choose two.)
To form an adjacency in OSPF over a broadcast connection, the 'options' and 'hello interval' fields must match. The 'hello interval' specifies how often routers send hello packets, and all routers on the same network must agree on this interval. The 'options' field indicates optional capabilities of the OSPF router and must also match to ensure compatibility. Thus, both these fields are crucial for successful OSPF adjacency formation.
Im confused the only 2 hello packet header that indicates must be the same are hello interval and dead interval, but no option. https://www.juniper.net/documentation/us/en/software/junos/ospf/topics/topic-map/ospf-overview.html Hello interval—How often the router sends hello packets. All routers on a shared network must use the same hello interval. Router dead interval—How long the router waits without receiving any OSPF packets from a router before declaring that router to be down. All routers on a shared network must use the same router dead interval. Options—Optional capabilities of the router.
C & D; because the other options don't really contribute. Values for 'router priority' and 'options' don't seem to affect the adjacency. Neither does 'neighbor' value, but compared to A & B, is *seemingly* a better answer. Router priority - The router’s priority to become the designated router. Options - Optional capabilities of the router. Hello interval - How often the router sends hello packets. All routers on a shared network must use the same hello interval. Neighbor - IP addresses of the routers from which valid hello packets have been received within the time specified by the router dead interval. https://www.juniper.net/documentation/us/en/software/junos/ospf/topics/topic-map/ospf-overview.html
Completely fudged this... "hello interval" and "options" Network mask - all routers on the segment must agree on the subnet mask of the link. Options - These options are critical for correct OSPF operation; must match between neighbors.
The suggested answer is correct
This is correct