For two OSPF neighbors to establish a full adjacency on a broadcast medium, what information in their hello packets must match? (Choose two.)
A.
network mask
B.
router priority
C.
dead interval
D.
the list of neighbors on the network
Explanation:
Hello PacketsRouters periodically send hello packets on all interfaces, including virtual links, to establish and maintain neighbor relationships. Hello packets are multicast on physical networks that have a multicast or broadcast capability, which enables dynamic discovery of neighboring routers. (On nonbroadcast networks, dynamic neighbor discovery is not possible, so you must configure all neighbors statically as described in Configuring an Interface on a Nonbroadcast, Multiaccess Network.)
Hello packets consist of the OSPF header plus the following fields:
* Network maskNetwork mask associated with the interface.
* Hello intervalHow often the router sends hello packets. All routers on a shared network must use the same hello interval. You configure this interval as described in Modifying the Hello Interval.
* OptionsOptional capabilities of the router.
* Router priorityThe routers priority to become the designated router. You can configure this value as described in Configuring the Priority for Becoming the Designated Router.
* Router dead intervalHow 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. You can configure this value as described in Modifying the Router Dead Interval.
* Designated routerIP address of the designated router.
* Backup designated routerIP address of the backup designated router.
* NeighborIP addresses of the routers from which valid hello packets have been received within the time specified by the router dead interval.