point to point
dynamic 10
no dr bdr
multipoint
manual 30
no dr bdr
broadcast
dynamic 10
dr bdr
nonbroadcast
manual 30
dr bdr
router types
internal routers conencted to the same area
backbone routers routers connected to area 0
area border router abr routers connected to multiple areas
autonomous systems border router asbr routers conencted to segmetns external to ospf
