CCNA – OSPF Questions
Note: If you are not sure about OSPF, please read our OSPF Tutorial.
Answer A and C are obviously correct. For answer E, it allows extensive control of routing updates via Link-State Advertisement (LSA). Administrators can filter these LSAs to meet their requirements easily.
The “network 192.168.12.64 0.0.0.63″ equals to network 192.168.12.64/26. This network has:
+ Increment: 64 (/26= 1111 1111.1111 1111.1111 1111.1100 0000)
+ Network address: 192.168.12.64
+ Broadcast address: 192.168.12.127
Therefore all interface in the range of this network will join OSPF -> B C D are correct.
The default number of equal-cost paths that can be placed into the routing of a Cisco OSPF router is 4. We can change this default value by using “maximum-paths” command:
Note: Cisco routers support up to 6 equal-cost paths
Hierarchical design of OSPF (basically means that you can separate the larger internetwork into smaller internetworks called areas) helps us create a network with all features listed above (decrease routing overhead, speed up convergence, confine network instability to single areas of the network).
In the router ospf command, the ranges from 1 to 65535 so o is an invalid number -> A is correct but B is not correct.
The highest IP address of all loopback interfaces will be chosen -> Loopback 0 will be chosen as the router ID.