Which of the following describe the process identifier that is used to run OSPF on a router? (Choose two.)
A.
It is locally significant.
B.
It is globally significant.
C.
it is needed to identify a unique instance of an OSPF database.
D.
It is an optional parameter required only if multiple OSPF processes are running on the router.
E.
All routers in the same OSPF area must have the same process ID if they are to exchange routing information.
A & C
The process identifier used in OSPF is locally significant, which means it does not need to be the same on other OSPF routers and is not passed between routers -> A is correct.
Each process identifier is a unique instance of an OSPF database. We can create many process identifiers as we want (but ranges from 1 to 65,535) but it is not recommended because the router needs many resources to maintain these OSPF databases -> C is correct.
Process identifier is a “must” parameter even if we only run only one OSPF process -> D is not correct.
Routers in the same OSPF area can have different process identifier (process ID) because it is only locally significant -> E is not correct.
Nice explanation. Great!