A.Each OSPF area requires a loopback interface to be configured.
B.Areas may be assigned any number from 0 to 65535.
C.Area 0 is called the backbone area.
D.Hierarchical OSPF networks do not require multiple areas.
E.Multiple OSPF areas must connect to area 0.
F.Single area OSPF networks must be configured in area 1.

A.transparent
B.auto
C.on
D.desirable
E.blocking
F.forwarding

A.amount of RAM
B.bridge priority
C.IOS version
D.IP address
E.MAC address
F.speed of the links

A.dataintegrity
B.encryption
C.keyexchange
D.authentication

A.FTP
B.Telnet
C.SMTP
D.DNS
E.HTTP
F.POP3

A.127.0.0.0
B.127.0.0.1
C.224.0.0.9
D.126.0.0.1
E.127.0.0.121

A.IP
B.X.25
C.Ethernet
D.Frame-relay

A.192.168.20.29
B.192.168.20.16
C.192.168.20.17
D.192.168.20.31
E.192.168.20.0

A.TE1和NT2
B.TE2和TA
C.NT1和ISDN网络
D.NT1和NT2

A.255.255.255.0
B.255.255.255.128
C.255.255.252.0
D.255.255.255.224
E.255.255.255.192
F.255.255.248.0