Answers:
1. You'll divide an OSPF network into areas.
2. The default cost of an OSPF 56kbps link is 1785.
3. The default OSPF Hello time of an Ethernet interface is 10 seconds, so to double it we need to set it to 20 seconds.
Yeah, I know, but I still had to say it. :)
The OSPF Hello time can be set with the ip ospf hello-time command. That's one way, and the most obvious:
ip ospf hello-time 20
Another OSPF default is that the Dead time is 4 times the Hello time. Therefore, if we set the Dead time to 80 seconds, the Hello time will dynamically adapt to that - and change to 20 seconds.
ip ospf dead-time 80
Those are both interface-level commands.
4. "A". The default Hello time on Serial links is 30 seconds.
5. Two common names for the OSPF algorithm: SPF and Dijkstra.
6. "A". OSPF doesn't use Split Horizon.
7. "A". You definitely want the hub router to become the DR.
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