Review Questions

1:	What is an OSPF neighbor?
2:	What is an OSPF adjacency ?
3:	What are the five OSPF packet types? What is the purpose of each type?
4:	What is an LSA? How does an LSA differ from an OSPF Update packet?
5:	What are LSA types 1 to 5 and LSA type 7? What is the purpose of each type?
6:	What is a link state database? What is link state database synchronization?
7:	What is the default HelloInterval?
8:	What is the default RouterDeadInterval?
9:	What is a Router ID? How is a Router ID determined?
10:	What is an area?
11:	What is the significance of area 0?
12:	What is MaxAge?
13:	What are the four OSPF router types?
14:	What are the four OSPF path types?
15:	What are the five OSPF network types?
16:	What is a Designated Router?
17:	How does a Cisco router calculate the outgoing cost of an interface?
18:	What is a partitioned area?
19:	What is a virtual link?
20:	What is the difference between a stub area, a totally stubby area, and a not-so-stubby area?
21:	What is the difference between OSPF network entries and OSPF router entries?
22:	Why is type 2 authentication preferable over type 1 authentication?
23:	Which three fields in the LSA header distinguish different LSAs? Which three fields in the LSA header distinguish different instances of the same LSA?