Stub Network refers to the network that has only a single connection to a router.
A stub network may meet one or more of the following criteria:
1) A single OSPF area with no external routes (though it may have interarea and/or intra-area routes);
2) A single LAN which never carries packets between two remote hosts; all traffic is to and/or from local hosts (it may or may not be multiply-connected; but multiple routers on a stub network don't route to one another, they will only route packets into the LAN if it's destined for the LAN, and out from the LAN if it originated on the LAN);
3) A network that is only accessible by one path.
