What functions does the OSPF Hello protocol perform? (Choose two.)

The OSPF Hello protocol serves two primary functions: dynamic neighbor discovery and maintaining neighbor relationships. Routers send Hello packets out their OSPF-enabled interfaces to find other OSPF routers on the segment. Upon receiving a Hello packet, a router learns about its potential neighbor. Once neighbors are discovered, Hello packets continue to be exchanged periodically to ensure the neighbor is still alive and reachable. If a router stops receiving Hello packets from a neighbor within a specified Dead Interval, it declares that neighbor down. "It detects unreachable neighbors in 90-second intervals" is incorrect because the default Dead Interval is typically 40 seconds, not 90, and it's configurable. "It negotiates correctness parameters" is incorrect; Hello packets exchange parameters, but "negotiate correctness" isn't the accurate description of their function. "It uses timers to elect the router with the fastest links as the designated router" is incorrect; DR/BDR election is based on router priority and Router ID, not link speed. "It broadcasts hello packets throughout the internetwork" is incorrect; Hello packets are typically multicast (224.0.0.5) on multi-access segments, not broadcast throughout the entire internetwork.